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1
Lyubimov, Victor Ivanovich, Nikolay Frolovich Popov, and Grigory Ivanovich Sapunov. "Review and analysis of operation of best domestic and foreign river dredgers." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2020, no. 2 (May 22, 2020): 39–53. http://dx.doi.org/10.24143/2073-1574-2020-2-39-53.
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The article analyzes the development and modernization of energy and technological equipment, as well as soil productivity of dredging projects of both foreign and domestic manufacturers of dredging equipment. The emphasis has been placed on the installation and use of submersible pumps. The productivity of soil dredges has been found to increase due to changes in the design of soil sampling devices and soil pumps. The main characteristics of the American river dredgers with hydraulic cultivators and domestic river diesel dredgers with hydraulic soil cultivators have been considered and evaluated. The designs of the dredgers built in France and the Netherlands have been studied. To compare the technical and economic parameters of the standard type Beaver1600 dredger and the 82080-800 m3/h project domestic dredger there were carried out calculations by the specialists of Volzhskiy State University of Water Transport. There has been illustrated the layout of the TRN-3000 dredge pump (France) including a control cabin, a milling cultivator, a frame of a soil intake device, a submersible soil pump, an anchor support, etc.; layout of the KhAM-219 dredger (Netherlands); layout of Ellicott dredger (USA); layout of a domestic 350-50LPG dredger based on class 350-50L dredgers; a suction pump S-55P; layout of the Benoto dredger (France) including a mechanical cultivator, a soil pump, a hydraulic pump of a soil pump, a frame and a hydraulic cylinder for raising and lowering the frame. It has been inferred that the domestic dredgers are not inferior to the foreign models, taking into account that they are equipped with a new type of domestic rotary-bucket cultivator for working on inland waterways of Russia. The financial assessment of the construction of new domestic dredgers has been carried out.
2
Qi, Qiang, Feifei Qiao, Wenyuan Wang, Zijian Guo, and Ying Jiang. "A evaluation and selection model of dredger considering marine ecological environment and dredger performance." E3S Web of Conferences 294 (2021): 06001. http://dx.doi.org/10.1051/e3sconf/202129406001.
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There will be total suspended solids in port dredging, which will affect aquatic organisms and water quality. Therefore, with the Green Port becoming the core concept of port development, it is necessary to consider the impact of dredging on marine ecological environment when selecting dredgers. In this paper, the calculation method of biomass loss caused by dredging is proposed, and the biomass loss is taken as the evaluation index to establish a dredger selection model considering marine ecological environment and dredger performance. The dredger selection model uses the fuzzy synthetic evaluation method based on norm grey relational grade to evaluate and select dredgers quantitatively, avoiding the influence of subjective factors on dredger selection. Finally, the feasibility of dredger selection model is verified by a practical dredging engineering and the results indicate that the dredger selection model can serve as a scientific basis for the construction of ecological port and the protection of marine environment.
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Zhuang, Haifei, Mingming Liu, and Yongding Wu. "Study on Impeller Configuration Strategy of Dredger Pump with Different Conveying Distance." Journal of Physics: Conference Series 2329, no. 1 (August 1, 2022): 012019. http://dx.doi.org/10.1088/1742-6596/2329/1/012019.
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Abstract For DN850 dredge pumps of 3,500 m3/h series cutter suction dredger, on the premise of not changing the impeller size, by changing the parameters of impeller blade to reduce the head of dredge pump, special new impellers for inboard pump and submerged pump are designed; The flow field of the dredge pump is analyzed by numerical simulation. There is no vortex in the impeller channel and near volute tongue, which indicates that the hydraulic performance is excellent; At the flow rate of 10,000 m3/h, compared with the original impeller, the head of the two pumps in series with new impellers is reduced by 23 m, and the efficiency is close to that before modification, reaching more than 85%; This paper analyzes the matching between the dredger pump and the pipeline under three kinds of common sandy mud. By comparing the unit power consumption and productivity, it obtains the suitable conveying distance range of special new impellers of dredger pumps, and forms the impeller configuration scheme of 3,500 m3/h series cutter suction dredger with different conveying distance, which provides guidance for dredging engineering.
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Rumyantcev, Ernest G., and Evgeniy P. Ronnov. "DETERMINATION OF ELEMENTS AND CHARACTERISTICS OF RIVER SUCTION DREDGERS AT INITIAL DESIGN STAGES." Russian Journal of Water Transport, no. 62 (March 10, 2020): 71–80. http://dx.doi.org/10.37890/jwt.vi62.50.
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The article provides a methodology for calculating the basic elements and characteristics of river dredgers at the stages of research design by means of the statistical method. For the study, the most common projects of river non-self-propelled dredgers with both a residential superstructure and without it, in a wide range of soil productivity, were used. The dependences of the total displacement and the main engine power on such basic technical data as suction dredger performance and loosening depth were analyzed in detail. Graphic dependencies and analytical expressions for determining the main suction dredger dimensions were obtained. The issue of choosing the length of the main dredger compartments is considered, which allows to solve the problem of pre-splitting the hull into compartments. The analysis of the accuracy of the obtained statistical dependencies for determining the length of the vessel is provided.
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Маmatov, Farmon, Isroil Temirov, Samar Оchilov, Dilsabo Chorieva, Doniyor Rakhmatov, and Gulnoza Murtazaeva. "Substantiation the technology and parameters of the “paraplau” type soil dredger for a two-tier plow." E3S Web of Conferences 304 (2021): 03014. http://dx.doi.org/10.1051/e3sconf/202130403014.
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The purpose of the study was to substantiate the technology and parameters of the “paraplau” type soil dredger for a two-tier plow. The basic principles and methods of classical mechanics, mathematical analysis and statistics were used in this study. Sub-tillage loosening of the most compacted layers of the soil of the fields from under the cotton must be carried out in a strip way along the line of the middle of the irrigation furrows between the rows. It is established that for the implementation of strip loosening of the subarable soil layers of fields from under cotton, the width of the two-tier plow should be a multiple of the width of the row spacing. At the same time, for loosening the compacted subsurface layers of the middle of the row spacing of cotton with one working body, the soil dredgers are installed behind each even lower body in the plane of the field edges of the odd bodies. In the case of subtillage loosening of the middle of the row spacing by two soil dredgers with an inclined stand, one soil dredger is installed behind each lower body. An analytical relationship is obtained to justify the relative position of the plow bodies and the soil dredgers, as well as their parameters. Experimental studies have established that the resistivity of a two-tier plow decreases (in comparison with continuous loosening) when the most compacted layers of the middle of the row are loosened with a pointed paw by 17.56%, two soil dredgers with inclined posts by 24.04%, and one soil dredger with an inclined post by 23.24%.
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Kechkin, Aleksei Olegovich, Aleksandr Sergeevich Plekhov, and Oleg Stanislavovich Khvatov. "Improving efficiency of dredger electric power system." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2022, no. 1 (February 28, 2022): 50–57. http://dx.doi.org/10.24143/2073-1574-2022-1-50-57.
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Most river dredgers are equipped with several electric positioning drives, a soil pump electric drive and a hydraulic washing pump. The listed electric drives are the main consumers of electricity from the dredger diesel generators. It is necessary to change the structure of the ship electric power network in order to reduce fuel consumption by diesel generators. The energy characteristics of the dredger electric drive system with a different configuration of the converter equipment are determined. Simulation models of the dredger DC and AC power systems have been developed. The models were built using MATLAB Simulink software and SimPowerSystem library. Application of simulation models made it possible to assess the efficiency of using a DC bus in the power system of the dredger. The circuits of the dredger electric power system, electric drives of cross-dredging winches are illustrated. The operation modes of electric drives of cross-dredging winches are analyzed. The necessity of analyzing the operation of electric drives and of developing the control signals for the braking resistors of the frequency converter in the power control system is revealed. The parameters of the presented electric drives and their values are considered. The expressions for calculating the total power of the system nodes are given, taking into account the characteristics of the operating modes of the dredger electric drives based on an alternating current network. Using the developed version of the power system contributes to saving capital costs and specific fuel consumption. Modernization of the power system helps reduce the power of diesel generators, increase the efficiency of the system and reduce the power of the ventilation system of compartments with winch frequency converters, due to regenerative braking by the electric drives.
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Chertkov, Alexandr A., Vladimir Yu Ivanyuk, and Yaroslav N. Kask. "MODAL SYNTHESIS OF THE OBSERVER OF THE STATE VARIABLES OF THE RIVER DREDGER AUTOMATION SYSTEM." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 14, no. 5 (December 14, 2022): 787–97. http://dx.doi.org/10.21821/2309-5180-2022-14-5-787-797.
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The purpose of the work is to apply automation technologies and digitalization of the process of assessing the immeasurable variables of the state of the river dredger automation system when controlling high-tech software and hardware equipment with an electric drive, in order to increase the productivity of the vessels of the technical fleet when performing dredging operations on waterways. River dredgers are complex dynamic control objects, the performance of which in the conditions of digital transformation can be significantly increased through the use of new software and hardware, the algorithmization of which is based on neural network technologies and learning processes. To increase the efficiency and reliability of the operation of such facilities with the prospect of transition to unmanned control of the energy systems of dredgers, it is necessary to increase the information content of the complex of sensors containing information about the object state. In this regard, the use, along with the existing ones, of mathematical information sensors, which are observers, is proposed in the paper. On the example of controlling a precision electric drive, an algorithm for synthesizing a dynamic system with an observer, in which all components of the state variables vector are restored at the output coordinate, is considered. The proposed algorithm for the synthesis of the state vector evaluator is implemented in the form of a program compiled in the MATLAB codes, and it is demonstrated by the example of calculating a three-dimensional dynamic observer for the automation system of a river dredger. The obtained values of state variables and errors of their recovery, as well as the results of modeling the dynamic reactions of the automation system of the river dredger, correspond to the specified speed and required stability of the electric drive of the river dredger during its transition to a steady state under new initial conditions.
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Vale, Carlos, Ana M. Ferreira, Cristina Micaelo, Miguel Caetano, Eduarda Pereira, Maria J. Madureira, and Elsa Ramalhosa. "Mobility of contaminants in relation to dredging operations in a mesotidal estuary (Tagus estuary, Portugal)." Water Science and Technology 37, no. 6-7 (March 1, 1998): 25–31. http://dx.doi.org/10.2166/wst.1998.0731.
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During the construction of a New Bridge over the Tagus estuary 2.5 million tons of sediments were dredged, part of this quantity being contaminated material. The extension and intensity of the water turbidity associated with dredging operating varied with the tidal conditions but the resuspended material collected near the bucket dredger did not present a concentration increment in metals and PCB, when compared to the estuarine suspended sediments. The calculated distribution coefficients suggest that some contaminants in solids near the dredger were not in equilibrium with the water. A 24-hour laboratory experiment demonstrated the complexity and quickness of anoxic sediments oxidation. In such a short period of time metals in the solids change their fractionation. A second laboratory simulation showed that mussels accumulate metals and PCB congeners when placed in turbid aerated water.
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Firdaus, Aden, Muhammad Rizkiansyah, and Yessi Nirwana. "Analisis Perbandingan Biaya pada Pekerjaan Pengerukan di Alur Pelabuhan Bandar Bakau Jaya Banten." Jurnal Rekayasa Hijau 4, no. 2 (August 7, 2020): 62–71. http://dx.doi.org/10.26760/jrh.v4i2.15-23.
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ABSTRAKPelabuhan Bandar Bakau Jaya yang terletak di Provinsi Banten saat ini dapat melayani kapal yang berjenis 5.000 DWT, dan rencananya akan melayani kapal 10.000 DWT. Pekerjaan pengerukan akan dilakukan pada Alur Pelabuhan dengan dimensi panjang 2.391 m dengan jenis tanah adalah tanah halus berpasir. Tujuan dari penelitian ini adalah membandingkan biaya dan waktu pelaksanaan dari masing- masing jenis kapal keruk yang dapat melakukan pekerjaan pengerukan dengan kondisi tanah yang ada di alur pelabuhan. Metode yang digunakan adalah dengan memperhitungkan berapa lama waktu pekerjaan pengerukan sehingga didapatkan biaya dari masing-masing jenis kapal keruk. Hasil dari analisis didapatkan 3 jenis kapal keruk yaitu, TSHD dalam waktu 2,11 bulan dan biaya Rp27.316.912.819,63, SD dalam waktu 8,34 bulan dan biaya Rp27.887.202.652,35, dan CSD dalam waktu 6,08 bulan dan biaya Rp37.995.671.214,00. Jenis kapal keruk yang paling efisien untuk pekerjaan pengerukan di alur pelabuhan ini adalah TSHD dengan 7 tugboat dan barge.Kata kunci: pengerukan, alur pelayaran, kapal keruk ABSTRACTBandar Bakau Jaya Port, located in Banten Province, currently serves 5,000 DWT vessels, and it is planned to serve 10,000 DWT vessels. Dredging work will be carried out on the Port Channel with a dimension of 2,391 m in length with a fine sandy soil type. The purpose of this study is to compare the cost and implementation time of each type of dredger that can carry out dredging work with existing soil conditions in the port channel. The method used is to calculate how long the dredging work is so that the cost of each type of dredger is obtained. The results of the analysis found 3 types of dredges namely, TSHD in 2.11 months and costs Rp27,316,912,819.63, SD in 8.34 months and costs Rp27,887,202,652.35, and CSD in 6, 08 months and costs Rp37,995,671,214.00. The most efficient type of dredger for this work is TSHD with 7 tugboats and barges.Keywords: dredging, fairway, dredger
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Firdaus, Aden, Muhammad Rizkiansyah, and Yessi Nirwana. "Analisis Perbandingan Biaya pada Pekerjaan Pengerukan di Alur Pelabuhan Bandar Bakau Jaya Banten." Jurnal Rekayasa Hijau 4, no. 2 (August 7, 2020): 62–71. http://dx.doi.org/10.26760/jrh.v4i2.62-71.
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ABSTRAKPelabuhan Bandar Bakau Jaya yang terletak di Provinsi Banten saat ini dapat melayani kapal yang berjenis 5.000 DWT, dan rencananya akan melayani kapal 10.000 DWT. Pekerjaan pengerukan akan dilakukan pada Alur Pelabuhan dengan dimensi panjang 2.391 m dengan jenis tanah adalah tanah halus berpasir. Tujuan dari penelitian ini adalah membandingkan biaya dan waktu pelaksanaan dari masing- masing jenis kapal keruk yang dapat melakukan pekerjaan pengerukan dengan kondisi tanah yang ada di alur pelabuhan. Metode yang digunakan adalah dengan memperhitungkan berapa lama waktu pekerjaan pengerukan sehingga didapatkan biaya dari masing-masing jenis kapal keruk. Hasil dari analisis didapatkan 3 jenis kapal keruk yaitu, TSHD dalam waktu 2,11 bulan dan biaya Rp27.316.912.819,63, SD dalam waktu 8,34 bulan dan biaya Rp27.887.202.652,35, dan CSD dalam waktu 6,08 bulan dan biaya Rp37.995.671.214,00. Jenis kapal keruk yang paling efisien untuk pekerjaan pengerukan di alur pelabuhan ini adalah TSHD dengan 7 tugboat dan barge.Kata kunci: pengerukan, alur pelayaran, kapal keruk ABSTRACTBandar Bakau Jaya Port, located in Banten Province, currently serves 5,000 DWT vessels, and it is planned to serve 10,000 DWT vessels. Dredging work will be carried out on the Port Channel with a dimension of 2,391 m in length with a fine sandy soil type. The purpose of this study is to compare the cost and implementation time of each type of dredger that can carry out dredging work with existing soil conditions in the port channel. The method used is to calculate how long the dredging work is so that the cost of each type of dredger is obtained. The results of the analysis found 3 types of dredges namely, TSHD in 2.11 months and costs Rp27,316,912,819.63, SD in 8.34 months and costs Rp27,887,202,652.35, and CSD in 6, 08 months and costs Rp37,995,671,214.00. The most efficient type of dredger for this work is TSHD with 7 tugboats and barges.Keywords: dredging, fairway, dredger
11
Yuan, Xiao Qing, Qing Wang, Yu Bin Xia, Jing Song, and Sen Lin. "A Study on Pore Diameter Distribution of Saliniferous Dredger Fill Consolidated by Vacuum Preloading." Advanced Materials Research 301-303 (July 2011): 1511–16. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1511.
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The pore structure of soil plays a decisive role in its engineering properties. In order to investigate the consolidation effect and pore distribution characteristic of saliniferous dredger fill after vacuum preloading, the indoor simulation experiments of vacuum preloading were carried out in two boxes, after vacuum preloading, the dredger fill was tested for its physicochemical and mechanical properties. Simultaneously, the mercury intrusion porosimetry was performed to obtain distribution of pore characteristic parameters, and analyzed its pore diameter distribution of dredger fill after vacuum preloading and the consolidation effect in the perspective of micro and macro. The research showed that the total pore volume and porosity of the No.1 box is lower than the No.2 box, and its bearing capacity and consolidation effect are much higher. When the dredger fill locates at the same distance from drainage plate, the deeper the dredger fill is buried, the smaller the porosity is, the better the bearing capacity and consolidation effect are. The pore of dredger fill in No.1 box is based mainly on meso pore, while the one in No.2 box is based mainly on meso pore and macro pore.
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Li, Junyu, Yuanyuan Shi, Kunpeng Rao, Kaiyang Zhao, Jianfeng Xiao, Ting Xiong, Yizhe Huang, and Qibai Huang. "The Design and Analysis of Double Cutter Device for Hinge and Suction Dredger Based on Feedback Control Method." Applied Sciences 12, no. 8 (April 9, 2022): 3793. http://dx.doi.org/10.3390/app12083793.
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The hinge and suction dredger is widely used in the construction field such as in river and lake management, water dredging, and port infrastructure projects, etc. With the continuous development of modern dredging technology, the traditional hinge and suction dredger cannot adapt to the complex environment during the construction process and there are problems such as large energy consumption and over-excavation and leakage excavation. In this paper, a double cutter dredger was designed that has a wider adaptability to water than a single cutter dredger. At the same time, based on the principle of passive adaptive control, the working parameters of the control system were calculated and determined, and an adaptive control algorithm was proposed to determine the water environment by using the current difference between the two cutters. Finally, the feasibility of the structure and algorithm was verified by experiments. The efficiency of cutter suction dredger was improved, and the energy consumption was reduced by 9–25% in the ideal state.
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Li, Xiangcai, and Ping Jing. "Analysis of The Migration and Accumulation Process of Nitrate-nitrogen Pollutants in The Unsaturated Zone of Soil." E3S Web of Conferences 293 (2021): 01004. http://dx.doi.org/10.1051/e3sconf/202129301004.
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In order to understand the migration process of nitrate-nitrogen pollutants in the shallow unsaturated zone of the soil, the Tianjin coastal dredger and typical fluvo-aquic soils in North China were used as the research objects. The Hydrus-1D software was used to establish a numerical model to simulate nitrate. The pollution process of nitrogen pollutants in the unsaturated zone of soil, the results show that: during the migration process of the two kinds of shallow vadose zones of soil, the nitrate-nitrogen pollutants migrate downward at the maximum concentration before reaching the maximum concentration. After the maximum concentration, the concentration of nitrate nitrogen in the soil no longer increases; due to the difference in the average particle size of the soil, the migration rate of nitrate nitrogen in fluvo-aquic soil is significantly greater than that in artificial dredger soil. Nitrate nitrogen is in the simulation period completely passing through the simulated soil layer, the fluvo-aquic soil is completely passed through by nitrate nitrogen at 2d, and the artificial dredge fill is completely passed through by nitrate nitrogen at 2.5d.
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Zhanling, Fu, Liu Fang, Cao Jingquan, Gao Wuping, and Yao Xinqiang. "Study on Seismic Damage Mechanism of Dredger Fill Ground in Tianjin Binhai Area." E3S Web of Conferences 253 (2021): 01001. http://dx.doi.org/10.1051/e3sconf/202125301001.
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Tianjin binhai new area has a large area of dredger fill groud, And it is easy to produce dredger fill seismic settlement and saturated sand liquefaction under earthquake action. We simulate seismic subsidence state of Dredger Fill and liquefaction state of saturated sand under the 50-year probability of exceedance of 10% and 2% probability level earthquake by using Finn constitutive model in a certain soft foudition of Tianjin binhai new area. The results show that: Both seismic subsidence and liquefaction of saturated sand are the transition process from effective stress to pore water pressure. Moreover, dredger fill and saturated sand soil in the stronger the earthquake and the shallower buried depth are more likely to collapse and liquefaction.
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Kurbanov, Azizali, Dilshod Nazaraliyev, Azamat Kurbanov, Gulnora Jumaboyeva, Karim Islomov, and Yakubova Gulkhayo. "Establishment of volume of channel silting and organization of treatment works in the conditions of Amudarya River." E3S Web of Conferences 365 (2023): 03046. http://dx.doi.org/10.1051/e3sconf/202336503046.
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The article discusses methods for ensuring guaranteed water intake and the process of sedimentation in the head sedimentation tank. Based on the results of a full-scale study of the supply channel, a recommendation was developed to improve its operation. The results of surveys of the hydraulic and alluvial regimes of sediments in the channel of supply channels are analyzed and summarized as well as the organization of cleaning work and recommendations for the appropriate placement of dredgers along the channel length. The arrangement of dredgers is carried out depending on the distribution of sediment volumes along the length of the channel, taking into account the type and performance of each dredger.
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Lin, Jinxin, Hanmei Wang, Tianliang Yang, and Xinlei Huang. "Spatial–temporal characterization of land subsidence induced by large area distribution of recent dredger fill." Proceedings of the International Association of Hydrological Sciences 382 (April 22, 2020): 131–35. http://dx.doi.org/10.5194/piahs-382-131-2020.
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Abstract. Large-scale land subsidence often occurs after large-scale land formation caused by dredger fill, which affects the sustainable development of the region. In order to prevent and control land subsidence in the area with dredger fill, the characteristics of land subsidence and its main influencing factors need to be studied. A typical region was examined using geological survey data, land-level monitoring and comparative analysis, to provide insight regarding the variability of dredger-fill characteristics and impacts on land subsidence. The geological survey results provided the information about burial distribution characteristics of dredger fill and its underlying soil layers. The land-level monitoring results were analyzed to characterize the spatial–temporal distribution of land subsidence. The comparative analysis of land subsidence with the formation time, soil properties, thicknesses of dredger fill and the lower soft soil layer provided information about the different impacts. The monitoring results show that the land subsidence of dredger fill areas was substantially larger than that of adjacent areas. The later the filling was formed, the thicker the filling is, and the more clay-rich the soil property and the thicker the soft soil layer is, the larger the land subsidence is. Finally, the future trend of land subsidence in the study area are given and some suggestions on the prevention and control of land subsidence are also given.
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Dudinskii, Fedor, Boris Talgamer, and Nikolai Murzin. "Justifying the parameters of dredging in various types of stopes and massive productive strata." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 3 (May 14, 2020): 5–14. http://dx.doi.org/10.21440/0536-1028-2020-3-5-14.
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Introduction. Due to a wide variety of placer dredging conditions, traditional methods of dredging parameters calculation do not always take into account all aspects of productive strata mining. It is first of all true for deep placers operation and mining with side cuts. Research aim is to improve the methods of calculating dredging parameters and the capacity of pilesupported bucket chain dredgers. Methodology. Existing methods of calculating dredging parameters and dredgers capacity do not take into account the applied mining method, stope type, and upper stope cave-in conditions. The indicated factors greatly influence the parameters of productive strata excavation and washery refuse disposal. Taking these ISSN 0536-1028 «Известия вузов. Горный журнал», № 3, 2020 13 factors into account makes it possible to forecast the indicators of the pile-support dredgers more accurately. Results. Investigation of some aspects of dredging trenches and side cuts has made it possible to establish the dependence of dredger maneuvering angle in pit face and capacity on cutting depth when mining massive productive strata; spoil dumps parameters dependence on the type of stoping; the interrelation between the daily capacity and the width of the front bank under various vertical distribution of rock. The indicated dependences allow to determine dredging parameters and indicators for particular conditions. Summary. The proposed approach, which calculates dredging parameters when using side cuts and when mining deep placers with non-uniform thickness of sands, makes it possible to calculate the chips size, buckets filling ratio and sand fragmentation ratio in a more substantiated way; it makes it possible to more effectively manage the process of sand mining, thus increasing the capacity of dredges.
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Li, Wei, Cong Xue, and Xinxin Li. "Magneto-Elastic μ-Vibrator for Smashing Thrombus." Micromachines 10, no. 1 (January 21, 2019): 74. http://dx.doi.org/10.3390/mi10010074.
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A miniaturized thrombus dredger is proposed and developed in this study. The flexural resonance of the µ-resonator dredger is driven by a bulk-extensional magneto-elastic vibrator that is externally excited by alternating magnetic-field. With the fabricated prototype of the resonant dredger, a mice thrombus blocked in a simulated vessel is broken into micro-pieces, and the previously blocked vessel can recover to an unobstructed state within 1 h. A flow-rate ratio detection method is used to evaluate the thrombus-cleaning effectiveness. The comparison between the finite-element simulation and the experimental results validates the flow-rate ratio detection method. By optimally exciting the resonant dredger in its third resonant mode, the flow-rate ratio in the cleaned vessel increases by about 2.7 times compared with that in the partly blocked vessel, and the thrombus is smashed into micro-pieces.
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Yu, Chengxi, Menghong Yu, and Wei Yuan. "Data-driven predictive control for the swing process of a cutter suction dredger." Journal of Physics: Conference Series 2121, no. 1 (November 1, 2021): 012033. http://dx.doi.org/10.1088/1742-6596/2121/1/012033.
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Abstract The working process of cutter suction dredger is complex, so it is difficult to establish accurate model by traditional physical modeling method. The final yield of cutter suction dredger is directly related to the density of the slurry in the pipeline, while the density is controlled by the swing process. Therefore, by analyzing the measured data of the dredger, it establishes the swing process mathematical model based on subspace theory. The algorithm is based on input–output data, simulation results show the algorithm is effective for the control application.
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Xu, Ting, Zhong Xiao, and Lian Cheng Sun. "Study on Settlement Process of Dredger under Current Force." Advanced Materials Research 989-994 (July 2014): 2332–35. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.2332.
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A 3D-dimensional numerical simulation on the process of dredger under current force was carried out by using the finite element software ABAQUS, which is one of the most advanced nonlinear finite element softwares in the world.The interaction between the dredger and the seabed soil foundation is complex and the calculation considering the elastic-plastic property of soil belongs to strong nonlinear problem.The results indicated that the settlement of the dredger increase largely in the first times and the settlement tended to be stable with the times increasing. The stable value is 0.069 meters.
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Nian, Ting Kai, Peng Cheng Yu, Miao Jia Lu, Mei Hui Diao, and Chu Nan Liu. "Consolidation-Creep Behavior of Dredger Fill Silty Sands under Different Normal Pressure in Caofeidian Port." Applied Mechanics and Materials 170-173 (May 2012): 2288–91. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2288.
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Hydraulic fill silty sands in Caofeidian port serves as the research object. Through a large volume uniaxial compression test of dredger fill silty sand, the stain-time curves under various levels of normal stress are obtained. The charts show that stain-time curves are all with similarly shaped nonlinear characteristics. The results of tests illustrate that dredger fill silty sands show some creep behavior. In general, the creep process can be divided into three stages: instantaneous deformation, rapid deformation and slow deformation. In addition, normal stress has an evident impact on consolidation-creep behavior of dredger fill silty sands. Initial deformation and final deformation grow larger and larger with an increasing normal stress. In the meanwhile, the time of achieving stable deformation becomes longer as well. Based on the achieved creep charts, a power function is proposed to describe the relationship of deformation-time for the dredger fill silty sands.
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Liu, Mingming, Jingzhao Hu, Haifei Zhuang, and Chunlei Yang. "Research on the Influence of Sliding Piece Gap on Dredging Performance and Installation Technology Improvement." Journal of Physics: Conference Series 2329, no. 1 (August 1, 2022): 012002. http://dx.doi.org/10.1088/1742-6596/2329/1/012002.
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Abstract In order to ensure the gap between the sliding piece of trailing suction hopper dredger and the hull suction to meet the operation requirements, taking a 4500 m3 trailing suction hopper dredger and a 12888 m3 trailing suction hopper dredger as examples, the solid-liquid two-phase flow method was used to simulate and analyze the influence of different gap between sliding piece and the hull suction on the dredging performance. On this basis, the sliding piece installation procedure was improved and successfully applied to a 6500 m3 trailing suction hopper dredger. The results indicate that the gap has a great influence on the production. The larger the gap, the lower the production and the stronger the non-uniformity of flow field distribution; When the gap is less than 4 mm, the production reduction rate is slow, and the dredging production decreases by about 2% when the gap is 2 mm,. When the gap is more than 4 mm, the dredging production decreases linearly with the increase of the gap. The application effect of the improved sliding piece installation technology is better, and the maximum gap of the sliding piece of the 6500 m3 trailing suction hopper dredger is only 0.45 mm, which meets the needs of dredging engineering.
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Yang, Ke, Jun-Lang Yuan, Ting Xiong, Bin Wang, and Shi-Dong Fan. "A Novel Principal Component Analysis Integrating Long Short-Term Memory Network and Its Application in Productivity Prediction of Cutter Suction Dredgers." Applied Sciences 11, no. 17 (September 2, 2021): 8159. http://dx.doi.org/10.3390/app11178159.
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Dredging is a basic construction for waterway improvement, harbor basin maintenance, land reclamation, environmental protection dredging, and deep-sea mining. The dredging process of cutter suction dredgers is so complex that the operational data show strong characteristics of dynamic, nonlinearity, and time delay, which make it difficult to predict the productivity accurately via basic principles models. In this paper, we propose a novel integrating PCA-LSTM model to improve the productivity prediction of cutter suction dredger. Firstly, multiple variables are reduced in dimension and selected by PCA method based on the working mechanism of cutter suction dredger. Then the productivity is predicted via mud concentration in long short-term memory network with relevant operational time-series data. Finally, the proposed method is successfully applied to an actual case study in China. Also, it performs well in the cross-validation and comparative study for several important characteristics: (i) it involves the operational parameters based on the mechanism analysis; and (ii) it is a deep-learning-based approach that can deal with operation series data with a special memory mechanism. This study provides a heuristic idea for integrating the data-driven method and supervision of human knowledge for application in practical engineering.
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Su, Xiao Ping, and Jing Song. "Physical and Chemical Characteristics of High Clay Content Dredger Fill in Different Regions." Applied Mechanics and Materials 477-478 (December 2013): 614–19. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.614.
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The use of high clay content dredger fill is a popular way to reclaim and create new land for development in coastal areas. In this paper, the dredger fill samples were obtained from 7 locations on the Bohai Sea coast in China. The soils were tested for Granulometric composition, physical composition, chemical composition, and Atterberg Limits. These results are reported. The principle finding shows that the chemical composition of the pore fluids, such as namely problems of drainage and consolidation, has influence on the geotechnical properties of different soils. This work provides the basis for further research on the drainage and consolidation properties of high clay content dredger fill.
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Shen, Yupeng, Ping Li, Peng Jing, Ying Liu, Ruiling Feng, and Xin Liu. "Experiment and Mechanism Analysis on the Solidification of Saline Dredger Fill with Composite Slag Solidifying Agent: A Case Study in Caofeidian, China." Applied Sciences 12, no. 4 (February 11, 2022): 1849. http://dx.doi.org/10.3390/app12041849.
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Most areas of Caofeidian (Tangshan Caofeidian New District in Hebei Province, China) were formed by land reclamation, where the dredger fill has a high water content and a high salt content. The solidification of Caofeidian’s dredger fill is difficult because of salinisation, as well as environmental and economic factors. This article proposes a composite slag solidifying agent. The optimal proportion of various additives was determined by an unconfined compression test and orthogonal design. Next, a microanalysis was carried out by SEM and XRD tests to characterise the solidification mechanism of the composite slag solidifying agent. The results reveal that the composite slag solidifying agent can substantially improve the unconfined compressive strength of Caofeidian’s saline dredger fill by imparting a good microstructure: a compact overall structure was obtained and few voids were observed in the solidified soil. The optimal proportion was determined as 10% slag + 1.0% quicklime + 0.8% sodium silicate + 1.5% gypsum powder. In addition, the composite slag solidifying agent can effectively reduce the content of soluble salts in saline dredger fill and substantially improve the engineering characteristics of solidified soil.
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Zhang, Huan, Menghong Yu, and Wei Yuan. "Cutting Process Model Design of Cutter Suction Dredger Based on Auto Regressive eXogenous and Radial Basis Function model." Journal of Physics: Conference Series 2137, no. 1 (December 1, 2021): 012064. http://dx.doi.org/10.1088/1742-6596/2137/1/012064.
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Abstract The dredging operation of the strander dredger is complex, and the mathematical model established according to its key equipment characteristics is not possible to describe such a system having time degeneration and non-linear. Therefore, based on the analysis of mud formation process of dredger, RBF-ARX model is used to model the cutting process, and mud concentration is taken as the output. This modeling method is a combination model based on the theory of Auto-Regressive eXogenous (ARX) model and Gauss radial basis function (Radial Basis Function) neural network (RBF). The comparison between the simulation results and the actual data shows that the model can accurately describe the dynamic characteristics of cutter suction dredger in the cutting process.
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Shuai, Yang, Liu Wenbai, and Liu Hongwei. "Quantitative Analysis of the Relationship Between Shear Strength and Fractal Dimension of Solidified Dredger Fill with Different Fly Ash Content Under Monotonic Shear." Polish Maritime Research 25, s2 (August 1, 2018): 132–38. http://dx.doi.org/10.2478/pomr-2018-0084.
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Abstract The dredger fill of Shanghai Hengsha Island Dongtan is solidified by curing agents with different fly ash content, and the shear strength index of solidified dredger fill is measured by the direct shear test. The microscopic images of solidified dredger fill are obtained by using SEM. The microscopic images are processed and analyzed by using IPP, and the fractal dimension including particle size fractal dimension Dps, aperture fractal dimension Dbs and particle surface fractal dimension Dpr is calculated by fractal theory. The quantitative analysis of the relationship between shear strength index and fractal dimension of solidified dredger fill is done. The research results show that the internal friction angle and the cohesion are closely related to the fly ash content λ and the curing period T, and the addition of fly ash can improve the effect of curing agent; There is no obvious linear relationship between the internal friction angle and the three fractal dimensions; The smaller particle surface fractal dimension Dpr and particle size fractal dimension Dps, the larger aperture fractal dimension Dbs, the greater the cohesion, and the cohesion has a good linear relationship with three fractal dimensions, and the correlation coefficient R2 is above 0.91.
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Saputra, Aleo, E. P. S. B. Taman Tono, and Guskarnali Guskarnali. "Kajian Teknis Penggalian Lapisan Tanah Atas dan Kaksa untuk Meningkatkan Laju Pemindahan Tanah pada Kapal Keruk 21 Singkep 1 di Perairan Air Kantung, Sungailiat, Bangka." MINERAL 2, no. 2 (January 29, 2020): 47–55. http://dx.doi.org/10.33019/mineral.v2i2.1551.
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One of the parameters of dredgers succeed is the rate success of overburden and kaksa per hour. For Dredger 21 Singkep 1 in September 2016 its LPT reach 493 m3/h, so it is still not yet achieved the ideal LPT dredger with bowl measuring 24 cuft of 782,44 m3/hour. The technical study on the excavation of top soil and kaksa done through the stages of research that consists of data collection, grouping the data as well as data processing and analysis. The results of this study indicateLPT ideal on the excavation of top soil for 978,05 m3/hour can be achieved by setting an average depth of 0.54 m emphasis ladder on the side wire speed of 6.82 m/minute and the pull wire speed setting aside that is equal to 8,04 m/minute at an average depth of 0.46 m emphasis ladder, while ideal in the excavation layer kaksa’s LPT of 586.83 m3/hour can be achieved by setting an average depth of 0.26 m emphasis ladder on the side of the wire speed 8.73 m/minute and the pull wire speed setting aside of 11.16 m/ minute at an average depth of 0.20 m emphasis ladder. LPT excavation of topsoil using face long methods reaches 845.38 m3/hour, or an increase of 19.7% from the LPT on short face methods that is equal to 652.78 m3/hour.
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Ferreira, Claudio Matheus Silva Lobato, João Batista Furlan Duarte, Levy Galas Jacob, Edson Augusto Soares Lopes, Ricardo Gomes Félix Júnior, and Romário Nogueira Monteiro. "DRAGA DE AR / AIR DREDGER." Brazilian Journal of Development 6, no. 9 (2020): 68017–23. http://dx.doi.org/10.34117/bjdv6n9-294.
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Xu, Guizhong, Ji Chen, Shenjie Shi, Angran Tian, and Qiang Tang. "Shear Behaviors of the Intersurface between Rice Straw Rope and Dredger Fill Silt: Experimental and Mechanism Studies." Advances in Civil Engineering 2020 (February 13, 2020): 1–10. http://dx.doi.org/10.1155/2020/6123218.
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The further development of land reclamation, port waterway, and wharf construction brings about proper treatments of dredger fill silt, while huge amounts of rice straw set aside in China argument rational disposal every year. Therefore, rice straw is bundled up as ropes, which represent as drainage body and reinforcement, to make eco-friendly treatment for dredger fill silt. This paper investigates the mechanical properties and validity of rice straw rope as certain treating material of dredger fill silt through a series of pull-out test, mass loss test, and tension test on specimens with different water contents and dry densities. The results reveal that peak value of interfacial shear strength rises with the increase of normal stress at the same immersion time, and in particular, it rises by up to 250.0% when the normal stress is 40 kPa. The tensile force of rice straw rope increases slowly with the rise of tensile displacement, and the failure mode changes from brittle to ductile with the rise of immersion time, which witnesses first rapid back slow degradation trend. The proper interfacial shear strength, tensile force, and reasonable degradation rate of rice straw rope make it ideal in drainage and consolidation of dredger fill silt.
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Li, Xin Jie, Qing Wang, Huan Yan, Jia Qi Li, and Fei Fei Wang. "Research on Engineering Geological Properties of Dredger Fill in Tianjin Qingfang Economic Region." Applied Mechanics and Materials 405-408 (September 2013): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.147.
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With the development of the coastal cities, land reclamation has become an important part in the construction of coastal engineering and the coastal development projects. In this paper, we consider the dredger fill of Tianjin Textile Economic Region as the research subject, analyzing the engineering geological characteristics of the dredger fill in this area from its basic physical properties, the soluble salt of the study area, the variation laws of PH and cation exchange properties.
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Zhuang, Haifei, Mingming Liu, and Tao Guo. "Modification and Optimization of Cylindrical Blade of Dredge Pump Based on CFD." Journal of Physics: Conference Series 2329, no. 1 (August 1, 2022): 012004. http://dx.doi.org/10.1088/1742-6596/2329/1/012004.
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Abstract The 3500 m3/h series cutter suction dredger pump adopts cylindrical blade impeller with low efficiency and serious wear of impeller channel; The twisted blade is optimized by conformal transformation method, and the blade wrap angle is increased by 75°; The efficiency of dredge pump with twisted blades is increased by 9% compared with cylindrical blades when the flow is 8000-12000 m3/h; The relative velocity nephogram shows that the twisted blade eliminates the vortex in the impeller channel and improves the flow field; Through the erosion simulation analysis of solid-liquid two-phase flow, through the surface equalization treatment of the erosion wear of the impeller wall, it is found that the average wear rate of the twisted blades is 19% lower than that of the cylindrical blades, indicating that the wear resistance of the designed twisted blade impeller has been improved and the service life of the dredge pump has been increased.
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Li, Kai Kai, and Huan Min Xu. "Multivariate Principal Component Analysis for Production and Energy Consumption of Cutter Suction Dredger." Applied Mechanics and Materials 644-650 (September 2014): 2211–15. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.2211.
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Cutter suction dredgers perform a major part in the field of dredging engineering in harbors, fairways, and land reclamation. However, there are many parameters in cutter suction dredger operation so that it is difficult to guarantee the stability of production. In consideration of the issue of enormous parameters in dredging operation, mathematical dimensional reduction method which uses multivariate primary component analysis is proposed. The method can calculate the contribution rate and cumulative contribution rate of each parameter and then select the principal components which influents the production and energy consumption. These parameters represent the majority of the original data information, while not interrelated with each other. The primary components can be used to guide the regulation and control of the parameters, reduce regulatory parameters and operational complexity and provide a theoretical basis for intelligent automation of dredging operations.
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Liu, Yinying, Honglin Yan, and Xu-an Qi. "Study on the Safety Analysis of Dredger Fill Sea Sand Reused in Embankment Slope near the Yangtze River." Journal of Physics: Conference Series 2424, no. 1 (January 1, 2023): 012011. http://dx.doi.org/10.1088/1742-6596/2424/1/012011.
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Abstract In view of the shortage of sand and gravel aggregates, the sea sand in coastal areas is used as roadbed filler in road restoration of tunnel project by the Yangtze river. The basic mechanical performance tests were carried out to demonstrate the particle gradation and consistency limit of dredger fill sea sand. Triaxial test and direct shear test were performed to analyze the stress-strain relationship of sea sand shear strength in riverside environment and the law of shear displacement under vertical pressure. The road performance was analyzed by testing the compaction characteristics and deformation resistance of dredger fill sea sand. The riverside slope is always damaged by water flow, therefore, the stability of the dredger fill sea sand road slope under the measures of wrapping soil was analyzed. Based on the analysis of existing measures to improve the safety of sea sand used in road, the technology of sea sand solidified by alkaline coupling agent is proposed.
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Zhuang, Haifei, Mingming Liu, and Yongding Wu. "Optimization and Application of D850 Dredge Pump Blades under Medium Coarse Sand Condition of Cutter Suction Dredger." Journal of Physics: Conference Series 2097, no. 1 (November 1, 2021): 012005. http://dx.doi.org/10.1088/1742-6596/2097/1/012005.
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Abstract Regarding wear issues of a dredge pump’s impeller as a cutter suction dredger transports medium coarse sand slurry, blades of the D850 dredge pump are modified and optimized, which extends the distance from the blade inlet root to the impeller suction and avoids damages of the impeller suction anti-wear ring. Analyses via computational fluid dynamics (CFD) simulation show that the head and the efficiency after blade modification have little changes compared with before optimization in the construction flow range of 10000-12000 m3/h under coarse sand condition. While it improves the flow field of impeller’s channels, decreases the vortex at the inlet root of the blades, ensures more uniform distribution of the solid particles. Meanwhile, this is beneficial to reductions of the channels’ wears. Applications from constructions show some improvements in the wears of the blade root. Through the construction data comparison, after replacing the modified impeller, dredging productivity will be increased by 15.1% and the fuel consumption per 10000 m3 will be then reduced by 11.5%.
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Syafrullah, Rizki, Gerry Giga Parulian, and Gilang Gunawan. "SISTEM VERTICAL DIGGING, BENCHES ATAU KOMBINASI? MANAKAH YANG DAPAT MEMBERIKAN TINGKAT KEBERHASILAN PALING TINGGI DALAM AKTIVITAS PENAMBANGAN KAPAL KERUK?" Prosiding Temu Profesi Tahunan PERHAPI 1, no. 1 (March 29, 2020): 125–36. http://dx.doi.org/10.36986/ptptp.v1i1.56.
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ABSTRAK Metode penambangan dengan kapal keruk (dredging) termasuk ke dalam metode penambangan tambang terbuka aquaeous, karena mekanismenya yang mirip dengan penambangan pada tambang terbuka, hanya saja kegiatan penggaliannya dilakukan di bawah permukaan air dengan alat penggalian berupa ember (bucket). PT. Timah Tbk sebagai salah satu perusahaan tambang yang memiliki ratusan Izin Usaha Pertambangan (IUP) Operasi Produksi untuk komoditas timah dan sebagai satu-satunya perusahaan yang memiliki beberapa unit kapal keruk, menggunakan armadanya dalam kegiatan penambangan endapan timah alluvial lepas pantai (offshore) di perairan Pulau Bangka dan Kepulauan Riau. Terdapat tiga jenis sistem penggalian pada operasional kapal keruk, yaitu sistem vertical digging, sistem benches dan sistem kombinasi. Sistem penggalian yang digunakan dapat mempengaruhi keberhasilan aktivitas penambangan pada kapal keruk yang dinilai berdasarkan parameter yaitu nilai Laju Pemindahan Tanah (LPT) dan kemiringan lereng (slope) yang dibentuk oleh proses penggalian. Analisis sistem penggalian bertujuan untuk melihat sistem penggalian manakah yang paling tepat untuk diterapkan pada kapal keruk sesuai dengan lokasi kerjanya. Data yang digunakan dalam analisis sistem penggalian merupakan data yang diperoleh langsung selama proses penggalian Kapal Keruk 21 Singkep 1 pada lokasi kerja Bulan Mei 2019. Data tersebut terdiri dari: nilai penekanan ladder, kecepatan naik turun ladder dan kecepatan tarik kawat. Kemudian pengolahan data dilakukan sehingga didapat nilai Laju Pemindahan Tanah (LPT) dan kemiringan lereng (slope) yang terbentuk dari proses penggalian menggunakan ketiga sistem penggalian yang ada. Analisis data dilakukan sehingga didapat poin-poin yang berkenaan dengan kelebihan dan kekurangan masing-masing sistem penggalian. Berdasarkan perbandingan tersebut maka dapat ditentukan sistem penggalian yang paling tepat untuk diterapkan pada Kapal Keruk 21 Singkep 1 sesuai dengan lokasi kerjanya adalah sistem penggalian kombinasi yang memiliki tingkat keberhasilan aktivitas penambangan tertinggi dengan nilai Laju Pemindahan Tanah (LPT) ) yang dapat mancapai target senilai 592,78 m3/jam dan kemiringan lereng (slope) akhir 45,83˚ yang sesuai dengan standar keamanan penambangan. Kata Kunci: Kapal Keruk, Sistem Penggalian, Laju Pemindahan Tanah, Kemiringan Lereng, ABSTRACT Mining using a dredger is an example of an aqueous open surface mining method. Due to its similarities of mining mechanism to a conventional open surface mining method, the difference being only the digging is carried out below the sea level (underwater) using a series of buckets. PT. Timah Tbk is a mining company that holds hundreds of mining concessions (Izin Usaha Pertambangan / IUP) for tin commodity and is the only company that owns several units of dredger, utilizing their fleet for mining operation of off-shore alluvial tin deposit in the waters of Bangka Island and Riau Archipelago. There are three known digging systems of dredger: vertical digging, benches and combination. These digging systems can affect the success of a dredger’s mining operation, which is assessed by following parameters: rate of material removal (Laju Pemindahan Tanah / LPT) and the inclination of slope formed by digging activities. The objective of this analysis on digging system is to find out which system should be applied depending on the dredger’s operational location. This analysis processes primary data obtained from digging activity of Kapal Keruk (dredger) 21 – Singkep 1 in May of 2019. The data consists of: ladder pressure, rate of ladder movement and pulling rate of wire. Thereafter, processing of data results in the value of rate of material removal and the slope inclination. Further analysis will disclose the benefits and also the shortcomings of each digging system. Based on acquired and processed data, the digging system that gives the highest rate of success of Kapal Keruk 21 – Singkep 1, which reflected on its rate of material removal of 592.78 m3/hour and final slope inclination of 45.83° (conform to the mining safety standard), is the combination system. Keywords: Dredger, Digging System, Rate of Material Removal, Slope Inclination
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Yu, Qing-bo, Qing Wang, Xue-xin Yan, Tian-liang Yang, Jian-ping Chen, Meng Yao, Kai Zhou, and Xin-lei Huang. "Assessment of subsidence and consolidation of dredger fill area based on SBAS-InSAR and laboratory tests." Proceedings of the International Association of Hydrological Sciences 382 (April 22, 2020): 381–86. http://dx.doi.org/10.5194/piahs-382-381-2020.
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Abstract. With the development of economy, land reclamation by dredger fill has become an effective measure to alleviate the shortage of land resources. However, the accompanying subsidence has always been a challenge to the safe use of soil in dredger fill area. In this study, Chongming East Shoal, China, where dredger filling activities are going on in recent years was selected as the study area. SBAS-InSAR was applied to monitor the variation of land subsidence and deformation in the recent two years. Furthermore, a total of 25 undisturbed soil samples including dredger fill and underlying soil were collected from 5 boreholes (maximum depth 55 m), and the land at each borehole had different a formation time. The physical properties and compressibility were tested by laboratory tests. Results show that for the current state, fast to slow subsidence velocity was observed in the reclamation area close to the coastline, which is controlled by building load and geological features of soil layers. The building load is the main factor affecting the land subsidence and special attention should be paid. It is the poor drainage condition of the soil layer in the offshore area resulting in slow subsidence. Consolidation degree and final settlement of soil can be obtained from monitoring data of land subsidence. Based on the settlement-time curve obtained by SBAS-InSAR, the estimated final settlement of typical settlement area is −27.03 to −38.96 mm, and the corresponding consolidation degree is 58.95 % on average. It still takes a long time to achieve stability. In conclusion, land subsidence is essentially the macro-accumulation of drainage consolidation of all the soil layers, so it is controlled by soil structure and engineering geological properties of both dredger fill and underlying soil layer. The research combined with field investigation, laboratory testing can provide a mechanism explanation for monitoring results. Future research will focus on longer monitoring time and a higher sampling frequency to enrich and improve the research.
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Wang, Bin, Shi-dong Fan, Pan Jiang, Han-hua Zhu, Ting Xiong, Wei Wei, and Zhen-long Fang. "A Novel Method with Stacking Learning of Data-Driven Soft Sensors for Mud Concentration in a Cutter Suction Dredger." Sensors 20, no. 21 (October 26, 2020): 6075. http://dx.doi.org/10.3390/s20216075.
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The dredger construction environment is harsh, and the mud concentration meter can be damaged from time to time. To ensure that the dredger can continue construction operations when the mud concentration meter is damaged, the development of a dredger with advantages of low price and simple operation that can be used in emergency situations is essential. The characteristic spare mud concentration meter is particularly critical. In this study, a data-driven soft sensor method is proposed that can predict the mud concentration in real time and can mitigate current marine mud concentration meter malfunctions, which affects continuous construction. This sensor can also replace the mud concentration meter when the construction is stable, thereby extending its service life. The method is applied to two actual construction cases, and the results show that the stacking generalization (SG) model has a good prediction effect in the two cases, and its goodness of fit R2 values are as high as 0.9774 and 0.9919, indicating that this method can successfully detect the mud concentration.
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Liu, Chun Qing, and Jing Feng Chen. "Analysis on Draghead Teeth of Drag Suction Hopper Dredgers Based on the Theory of Fuzzy Reliability." Advanced Materials Research 490-495 (March 2012): 228–32. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.228.
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Drag suction hopper dredger is dredg the hard compacted soil,dreghead teeth intensity will lead to an undersized cutting depth and a large cutting resistance, it raise failure probability. In this paper, investigate the relation between dredging depth，width,resistance and draghead teeth reliability influenced under different conditions,including various teeth,loads,navigating speeds and high-pressure jets.Discussed their effects on cutting depth,width and resistance.At last this paper obtain the reliability index and failure probability of the draghead teeth through the calculation numerical example.In this example,the method improvements efficiency for Draghead Teeth based on analysis on reliability.
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Kim, Jong-Oh, Seungjin Kim, and Jinwook Chung. "Recycle and disposal of contaminated dredged sediments using the pilot-scale hybrid process in dredger." Environmental Progress & Sustainable Energy 34, no. 2 (September 11, 2014): 476–84. http://dx.doi.org/10.1002/ep.12022.
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Čebašek, Vladimir, Veljko Rupar, Stevan Đenadić, and Filip Miletić. "Cutting Resistance Laboratory Testing Methodology for Underwater Coal Mining." Minerals 11, no. 6 (May 25, 2021): 564. http://dx.doi.org/10.3390/min11060564.
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The bucket-wheel dredge “Kovin I” for underwater coal mining with bucket-wheel type UCW-450 has been in operation for over 20 years. Based on analyzing the bucket-wheel dredger performance, productivity, maintenance costs, and reliability, a rational decision was made: to rehabilitate the most essential parts of the dredge, including the bucket wheel and the gearbox. However, the selection and construction of the excavator parts were performed on the ground of available laboratory data for digging resistance. The data itself was determined by the testing methodology that did not include the influence of surrounding water pressure at a certain depth of mining. According to the previous findings, it was necessary to develop a specific research and testing program that would involve appropriate laboratory testing of the geomechanical parameters. These were to represent the influence of hydrostatic water pressure on the working environment—coal. Nevertheless, geomechanical laboratory research tests were initially modified to provide reliable data of cutting resistance, especially in the water under different hydrostatic pressures, fully simulating the “in situ” working conditions of mining, i.e., cutting.
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Sala, Antonello, Jure Brčić, Bent Herrmann, Alessandro Lucchetti, and Massimo Virgili. "Assessment of size selectivity in hydraulic clam dredge fisheries." Canadian Journal of Fisheries and Aquatic Sciences 74, no. 3 (March 2017): 339–48. http://dx.doi.org/10.1139/cjfas-2015-0199.
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In hydraulic dredge clam fisheries, the onboard mechanical sorting can be considered as the main catch selection process. The catch is mechanically sorted by a sieve made up of a series of successive grids with holes of decreasing diameter. The effect of the grid hole diameter and sorting speed of the vibrating sieve of a hydraulic dredger was investigated in a field study to determine its clam selection properties and to formulate proposals aimed at improving fishery management. Data analysis demonstrates that it is technically impossible to achieve a knife-edge selection and that there is scope for improving the size selection process, for instance by increasing grid hole diameter, which, however, can be accompanied by a reduced catch of both undersized and commercial-sized individuals. An increase in the hole diameter to 21.71 mm, while ensuring less than 5% retention of undersized individuals, would entail a retention of 67% of the commercial sizes. The modelling approach applied can be extended to investigations of other dredge gear types and nonmobile benthic species.
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Bellamy, Andrew G. "The UK marine sand and gravel dredging industry: an application of Quaternary geology." Geological Society, London, Engineering Geology Special Publications 13, no. 1 (1998): 33–46. http://dx.doi.org/10.1144/gsl.eng.1998.013.01.03.
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AbstractMarine sands and gravels currently contribute 24% (over 20 million tonnes/year) of the total sand and gravel aggregate consumption of Great Britain. To maintain or increase this contribution into the future, the identification, assessment and licensing of additional sand and gravel resource areas is of fundamental importance. Research into the Quaternary history of the continental shelf surrounding the UK assists in the prediction of sand and gravel resource locations. Similarly, resource assessment is significantly improved through an understanding of the origin and formation of these Quaternary deposits.Geological considerations also feature strongly in the management of existing dredging licence areas and in the acquisition of future licences from the Crown Estate. Precise resource assessment, coupled with accurate dredger positioning and track recording systems, minimizes the extent of dredged sea bed, thereby limiting environmental impact and improving the consistency of dredged cargoes. Also important is the need to overcome marine aggregate prejudice which arises from the perception by some customers that marine dredged sands and gravels differ markedly from those obtained onshore. Central to this issue is the argument that some of the most substantial marine deposits originated in subaerial environments at similar times and by the same processes as their present-day terrestrial equivalents, having been deposited in Quaternary cold climate fluvial environments.
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Shen, Yang, and Zhon Qiu Fei. "Consolidation Properties of Dredger Fill over Liquid Limit under Different Back Pressure Levels." Advanced Materials Research 594-597 (November 2012): 213–17. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.213.
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Primary and secondary consolidation concur in the primary consolidation stage. Especially for the dredger fill with high moisture content, the coupling effect of primary and secondary consolidation was very obvious. Analysis on the secondary consolidation properties during primary consolidation is great significant to reveal the consolidation mechanism and identify the settlement calculation method. Therefore one dimensional consolidation tests were conducted with the dredger fill clay of Wenzhou over liquid limit. The tests were focused on the influence of different vertical loading and back pressure condition on soil’s secondary consolidation properties. The research showed that the secondary consolidation of dredger fill of in high moisture content was very obvious under the primary consolidation stage. The final consolidation pressure level was higher, the vertical deformation was larger at the same effective stress level. Through the consolidation tests with different back pressure levels, it further verified high pore pressure potential promoted the development of secondary consolidation. Further more, when the final consolidation pressure was a constant value, the total settlement of primary and secondary consolidation basically unchanged. So high pore pressure promoted the occurrence of secondary consolidation, but reduced and sped up the development of primary consolidation.
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ITO, Masanori, Hirosi MIZUNO, and Toshio OKAWA. "Automatic Operation Control System for Bucket Dredger." Journal of Japan Institute of Navigation 95 (1996): 241–49. http://dx.doi.org/10.9749/jin.95.241.
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Shao, Mingqi, Jin Wang, and Xuewen Ding. "Research on overflow diffusion characteristics of dredger." Journal of Physics: Conference Series 1600 (July 2020): 012003. http://dx.doi.org/10.1088/1742-6596/1600/1/012003.
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Maratua, Novrialdo, Hendra Saputra, and Lalu Giat Juangsa Putra. "Perancangan Spud Pada Dredger Barge 25 Meter." Jurnal Teknologi dan Riset Terapan (JATRA) 2, no. 2 (December 31, 2020): 70–79. http://dx.doi.org/10.30871/jatra.v2i2.2860.
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Operation of ships with special functions such as dredgers or commonly called Dredger Barge requires special support such as spuds. In addition to being able to replace anchors more effectively, it can also facilitate supporting vessels such as Anchor Handling Tug and ensure safety while operating. In this study planning and analysis needs to be done in order to estimate the reaction and the condition of the spud and the spud holder at the time of operation. The study approach uses Solidwork software to simulate the strength test of the material as well as the safety of the spud and the spud holder when receiving sea wave pressure, ocean currents and wind in extreme weather using Mild Steel (ASTM (S) A36) material. The results of the simulation of the strength and feasibility test of the spud and the spud holder were obtained with a von mises spud value of 0.0856 N / mm2 and a von mises value on the spud holder of 15.5 N/mm2 with the parameter value of the von mises spud and spud holder of 188 N / mm2. Furthermore, the simulation results of the shear stress value on the spud are 2.37x10-7 N/mm2 and the shear stress value on the spud holder is 3.32x10-5 N/mm2 with the parameter value of the spear shear stress and the spud holder of 141 N/mm2. Furthermore, the simulation results of the Deflection value for the spud is 0.00116 mm and the deflection value for the spud holder is 0.117 mm with the deflection spud parameter value of 80 mm, and the deflection parameter for the spud holder is 10 mm. The spud and spud holders in this design are feasible in production and have been guaranteed safety and feasibility by referring to the parameters according to the standards of the Bureau Veritas and American Institute of Steel Construction rules
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Soliwoda, Jarosław, Adam Kaizer, and Tomasz Neumann. "Possibility of Capsizing of a Dredger during Towing." Water 13, no. 21 (October 28, 2021): 3027. http://dx.doi.org/10.3390/w13213027.
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Small-size dredgers are used as a standard for dredging and maintaining the depth of the fairways to seaports, as well as of the ports themselves. These vessels are characterized by limited draft and a low freeboard. The safety of such craft, in terms of their stability, in relation to the conducted works is ensured by the observance of appropriate regulations and requirements. The use of these ships requires navigation between the ports in which they operate. Open sea navigation poses a threat to such vessels. The article presents two characteristic cases of overturning of vessels during sea towing. The requirements of existing freeboard regulations regarding the stability and stability of dredgers do not provide them with a sufficient level of safety at sea. Phenomena such as longitudinal and lateral swaying, wave boarding and dynamic action of the wind may lead to their overturning. The article deals with the problem of the influence of particular phenomena that threaten the stability of dredgers during sea navigation. The analysis of static and dynamic stability for various characteristic shapes of small dredgers is presented. The possibility of water entering the watertight compartments was also taken into account. The research was presented on the numerical models of dredgers. The main purpose of this paper was to assess the risks and possibilities of capsizing of small dredgers designated for port work and redevelopment during their sea voyage.
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Bai, Ming, Jin Hua Chen, Cheng Ning Xie, and Fang Hui Li. "Design ADRC for Cutter Suction Dredger Cutter Motor Variable Frequency Drive System." Advanced Materials Research 1008-1009 (August 2014): 650–53. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.650.
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In order to achieve precise speed control for cutter suction dredger cutter motor, the controller should adapt well to uncertainties, such as geological environment, water flow, mechanical disturbance, etc. It makes the design of cutter motor controller always a hard work. This paper proposes an active disturbance rejection controller (ADRC) approach for cutter suction dredger cutter motor variable frequency drive system. Firstly, the LabVIEW platform was established by virtual instrument technology, which collected operating data of cutter motor in fundamental wave and total harmonic distortion (THD). Then cutter motor motion mathematic model was built and the ADRC design method was introduced. Lastly, the simulation results in the cutter velocity control and disturbance environments were done. The results show that the ADRC controller has strong robustness, and the precise speed control can be implemented.
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Sobko, Borys, Anatolii Haidin, Oleksii Lozhnikov, and Jacek Jarosz. "Method for calculating the groundwater inflow into pit when mining the placer deposits by dredger." E3S Web of Conferences 123 (2019): 01025. http://dx.doi.org/10.1051/e3sconf/201912301025.
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The research aims to increase the performance efficiency of hydromechanization equipment under the conditions of pit operation of the Motronivskyi Mining and Concentrating Plant by determining the dynamics of change in the water level in the mine workings when developing the overburden rocks and mineral. It has been generalized the world experience of determining the groundwater inflows into mine workings, which are mined by means of hydromechanization equipment. The methods have been developed for calculating the underground water inflow into the pit reservoir, when mining the placer ores by hydromechanization equipment. It has been proved that the dredger work in the conditions of the Motronivskyi MCP pit is possible without external source of water supply. The research results in determining the influence of underwater mining of overburden rocks and ore by dredger for decreasing the water level and its subsequent recovery in the reservoir of the Motronivskyi MCP pit, allow to develop a mode of mining operations without an external source of water supply. The dynamics of water level fluctuations in mine working during the working week have been established. The research results have shown that the dredger, taking into account the technical characteristics, can continuously operate for 9.5 days under the conditions of underground water inflow into the Motronivskyi MPP pit. It has also been established that after the dredging of the overburden rocks is stopped, the level of water in the pit for 2.5 days will recover.