Journal articles: 'Hydraulic mining'

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Abduazizov, N. A., Zh B. Toshov, and A. Sh Zhuraev. "THE RESEARCH OF "HYDROBANK-COOLER" SYSTEMS OF HYDRAULIC POWER UNITS OF HYDRAULIC MINING MACHINES." EurasianUnionScientists 4, no. 2(71) (2020): 4–8. http://dx.doi.org/10.31618/esu.2413-9335.2020.4.71.598.

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Today, powerful expensive equipment is used in mining enterprises. Downtime, breakdowns and repairs of hydraulic mining machines lead to large financial losses of mining enterprises. Mechanical particles, microdroplets of water and air bubbles that fall into hydraulic fluids during operation, significantly affect the properties of the working fluid. In this regard, maintaining the quality of the working fluid used in expensive hydraulic mining machines is one of the most important tasks of modern hydraulics.

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Zhang, Wei, Dong Sheng Zhang, and Yong Shu Zhao. "Stability Analysis of Hydraulic Support in Large Inclined and High Mining Height Coalface." Applied Mechanics and Materials 101-102 (September 2011): 1105–8. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.1105.

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Under the condition of large inclined angle, the stability control of hydraulic support was always the challenge for the fully-mechanized mining in large inclined coal seams. Based on the specific geological conditions of 509 coalface with large inclined and high mining in Gaozhuang mine, the model of hydraulic support had been drawn by using SolidWorks software, and the inclination mechanical model of hydraulic support had been established to analyze its inclination stability along coalface. The calculation result shows that when the maximum inclination angle is 31° and the underhand angle is 10°, the minimum support resistance needed to keep the hydraulic support not dumping is 283.59 kN. Meanwhile, the critical support resistance required for the hydraulic support not to dump in inclination direction increases approximately linearly along with the increase of coalface mining height; under the same mining height condition, the critical support resistance increases along with the increase of the inclined angle. Therefore, the selection of the mining height and inclined angle of the coal seam must be considered at the beginning of the hydraulic support design.

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Rochev, Vikror. "Hydraulic borehole mining method possible application at Middle Larba alluvial gold field." E3S Web of Conferences 56 (2018): 01025. http://dx.doi.org/10.1051/e3sconf/20185601025.

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Gold on placer deposits is mainly extracted in two ways: open and underground. But the open method of mining has a great negative impact on the environment, and the mine method is characterized by high labor intensity, capital and operating costs. As an alternative to these methods of development of alluvial gold, the hydraulic borehole mining method can be used. The use of a well as a hydro-mining creates favorable opportunities for ensuring nature protection and safe operation. When applying the method, the well does not have hydraulic extractions: stripping, this allows preserving the cultural layer of the soil in its integrity; explosive, loading works and use of motor transport, excluding dustiness and gas pollution of the atmosphere; the hard and harmful work for people's health is eliminated. The method of well drilling requires further serious scientific, technical and developmental studies to increase its reliability and expand the field of application. Alluvial deposits of gold are the most favorable objects for hydraulic borehole mining under their mining and geological conditions. Recently, new gold placers have been identified and are being surveyed at a depth of more than 40 m. With a high content of metal in them, these placers are very promising for mining by the hydraulic borehole mining method. The reserves of gold in these fields reach several tens of tons. Against the backdrop of a reduction in inventories for open and underwater mining, large technical difficulties, significant capital investments and operating costs for underground mining of thawed buried placers, the advantages for gold mining by the hydraulic borehole mining method are increasing. Based on mentioned above, the study of the application of the hydraulic borehole mining method in the conditions of Siberia and the Far East is a timely scientific task.

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Lu, Haifeng, Nan Shan, You-Kuan Zhang, and Xiuyu Liang. "Effect of Strain-Dependent Hydraulic Conductivity of Coal Rock on Groundwater Inrush in Mining." Geofluids 2020 (December 23, 2020): 1–15. http://dx.doi.org/10.1155/2020/8887392.

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Hydraulic conductivity is an important parameter for predicting groundwater inrush in coal mining worksites. Hydraulic conductivity varies with deformation and failure of rocks induced by mining. Understanding the evolution pattern of hydraulic conductivity during mining is important for accurately predicting groundwater inrush. In this study, variations of hydraulic conductivity of rock samples during rock deformation and failure were measured using the triaxial servo rock mechanic test in a laboratory. The exponential formula of hydraulic conductivity-volume strain was proposed based on the experimental data. The finite-difference numerical model FLAC3D was modified by replacing constant hydraulic conductivity with the strain-dependent hydraulic conductivity. The coupled water flow and rock deformation and failure were simulated using the modified model. The results indicate that in the early time, the rocks undergo elastic compression with increasing rock strain, resulting in a decrease in hydraulic conductivity; then, the microcracks and fissures appear in the rock after it yields results in a sudden jump in hydraulic conductivity; in the later time, the hydraulic conductivity decreases gradually again owing to the microcracks and fissures that were compacted. The conductivity exponentially decreases with the volumetric strain during the periods of both elastic compression and postyielding. The simulated stress-strain curves using the modified model agree with the triaxial tests. The modified model was applied to the groundwater inrush of a coal mining worksite in China. The simulated water inflow agrees well with the observed data. The original model significantly underestimates the water inflow owing to it to neglect the variations of the hydraulic conductivity induced by mining.

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Adach-Pawelus, Karolina, and Daniel Pawelus. "Application of Hydraulic Backfill for Rockburst Prevention in the Mining Field with Remnant in the Polish Underground Copper Mines." Energies 14, no. 13 (June 27, 2021): 3869. http://dx.doi.org/10.3390/en14133869.

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In the polish underground copper mines owned by KGHM Polska Miedz S.A, various types of room and pillar mining systems are used, mainly with roof deflection, but also with dry and hydraulic backfill. One of the basic problems associated with the exploitation of copper deposits is rockburst hazard. Aa high level of rockburst hazard is caused by mining the ore at great depth in difficult geological and mining conditions, among others, in the vicinity of remnants. The main goal of this study is to investigate how hydraulic backfill improves the geomechanical situation in the mining filed and reduce rockburst risk in the vicinity of remnants. Numerical modeling was conducted for the case study of a mining field where undisturbed ore remnant, 40 m in width, was left behind. To compare the results, simulations were performed for a room and pillar mining system with roof deflection and for a room and pillar mining system with hydraulic backfill. Results of numerical analysis demonstrate that hydraulic backfill can limit rock mass deformation and disintegration in the mining field where remnants have been left. It may also reduce stress concentration inside or in the vicinity of a remnant, increase its stability, as well as prevent and reduce seismic and rockburst hazards. Hydraulic backfill as a local support stabilizes the geomechanical situation in the mining field.

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Huang, Qing Qing, and Qiu Jie Zhang. "Analysis on the Stability of Hydraulic Support in Great Tilt Angle Mining Face." Applied Mechanics and Materials 556-562 (May 2014): 519–22. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.519.

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The hydraulic support is mainly used in roadway and workplace for supporting and protecting in mining industry. The hydraulic support would appear the situation of declining, dumping and crowding on greater tilt angle mining face, these will threat the safety of the workplace, the safety of mining face is the key to the safety in production. This paper analyzes the reasons of declining, dumping in static force, gives respectively the angle range of working surface hydraulic support declining and dumping, proposes some relevant measures of the hydraulic support declining and dumping.

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Evmenova, Galina, and Sergey Evmenov. "Slurry Water Regeneration after Hydraulic Mining." E3S Web of Conferences 41 (2018): 01019. http://dx.doi.org/10.1051/e3sconf/20184101019.

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Treatment and clarification of coal-day suspensions involve of whole range of technological processes, the efficiency of which depends significantly on the concentration of finely dispersed coal in the water-coal suspension. The behavior of flocculation of coal and clay suspensions with high molecular weight substances making possible to forecast the efficiency of polymer action while controlling the electrokinetic properties and aggregate stability of disperse systems has been studied. Aggregation of fine dispersal particles leads to the acceleration of their sedimentation and intensifies technological processes. The flocculant’s efficiency depends on the molecular weight of a polymer and its structure, the charge value of its functional groups, and also the properties of solid particles’ surfaces, methods of solution preparations etc. These factors must provide strong adsorption during the creation of aggregates and provide a significant influence on the flocculant consumption

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Sha, Yong Bai, Xiao Ying Zhao, Liang Fei Li, and Yan He. "Research of Experiment Platform for Drilling Hydraulic Mining of Oil Shale." Advanced Materials Research 562-564 (August 2012): 789–92. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.789.

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Aimed at a new mining method of oil shale—Borehole Hydraulic Mining, the experiment platform for Borehole Hydraulic mining of oil shale is designed based on this, in order to evaluation of the effective damage to oil shale in different forms of jet, determine the economic and reasonable high-pressure jet parameters. The finite element analysis is conducted to the key components of the experimental platform. The Results Show that the parts design is reasonable and the experiment platform meets the requirements. The experimental platform provides the reliable equipment guarantee for the effective implementation of the hydraulic mining experiment.

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Li, Zhi. "Overview of the faults and diagnosis methods of the hydraulic system of modern coal mining machines." E3S Web of Conferences 528 (2024): 02019. http://dx.doi.org/10.1051/e3sconf/202452802019.

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The high power, high efficiency, low failure rate, and intelligence of coal mining equipment are important directions for the development of coal mining machines both domestically and internationally. The implementation of efficient and low failure coal mine equipment is an important prerequisite for ensuring the smooth deployment of intelligent mines. At present, coal mining equipment generally consists of three parts: mechanical, electrical, and hydraulic. However, hydraulic pressure is a necessary system for coal mining equipment to complete high-power and intelligent operations. This article will combine the author's years of work experience to summarize the current local faults and diagnostic methods of hydraulic systems in coal mine equipment.

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Tang, Shan Shan, and Chao Kun Wei. "Design of Monitoring System for Hydraulic Support Based on LabVIEW." Advanced Materials Research 989-994 (July 2014): 2758–60. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.2758.

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Hydraulic support is widely used under the mine while the pressure is the most important factors of its safety.In view of the defects about present pressure monitor of mining hydraulic support ,designing a mining hydraulic support pressure monitoring system based on LabVIEW.This article mainly introducing the overall structure of the system, hydraulic system principle, the LabVIEW program, data communication and interface design.Using LabVIEW collection and storage support’s real-time pressure information. On the basis of the single chip microcomputer and the LabVIEW for data processing and display, improving the real-time control of hydraulic support.

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Akanova, G., A. Sadkowski, S. Podbolotov, A. Kolga, and I. Stolpovskikh. "Ways to reduce hydraulic losses in multistage centrifugal pumping equipment for mining and oil-producing industries." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 6 (2021): 77–84. http://dx.doi.org/10.33271/nvngu/2021-6/077.

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Purpose. To study hydraulic losses in pumping units during pumping and transportation of liquids, to develop the design and technology solutions to improve the energy efficiency of centrifugal pumps in the mining and oil-producing industries. Methodology. In the theoretical and experimental analysis of hydraulic losses during the transportation of liquids, the hydraulics and experimental analysis methods were used. Findings. As a result of the research carried out, a new design scheme of a multistage centrifugal pump has been developed, providing a coaxial arrangement of impellers, which allows reducing hydraulic losses in pump elements and increasing the energy efficiency of pumping units. Originality. Based on the analysis of existing designs of multistage blowers of axial and centrifugal types, the distribution of hydraulic losses in the elements of a centrifugal blower with coaxial impellers is considered. Experimental dependences on the establishment of pressure flow and power characteristics are presented. Based on the accounting of hydraulic losses, the energy efficiency of the design of the pumping unit with the coaxial arrangement of the impellers was assessed. Practical value. The new design of a centrifugal pump with coaxial impellers reduces hydraulic losses by more than 23% compared to traditional designs of centrifugal pumps. The results of the work can be used by design, research, and industrial organizations engaged in the design and operation of pumping equipment.

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Liu, Boying, Xiaoxiang Wang, Xiuzhan Zhang, Jiancheng Liu, Liangwan Rong, and Yong Ma. "Research Status of Deep-Sea Polymetallic Nodule Collection Technology." Journal of Marine Science and Engineering 12, no. 5 (April 29, 2024): 744. http://dx.doi.org/10.3390/jmse12050744.

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The bottom of the ocean is rich in mineral resources, and deep-sea mining has been a research hotspot in recent years. As a key part of deep-sea mining operation, polymetallic nodule collection technology has been researched in many countries around the world. The distribution of deep-sea polymetallic nodule mining areas and the characteristics of nodules are summarized, which provides a reference for the study of collection technology and the optimization of pick-up device structure. In order to further establish a deep-sea mining collection technology system, the current development status of polymetallic nodule mechanical, mechanical–hydraulic composite and hydraulic collection technologies are summarized, and the analysis shows that hydraulic collection technology has a more promising commercialization prospect. For the hydraulic collection technology, the research progress of suck-up-based collection technology, Coandă-effect-based collection technology, double-row hydraulic collection sluicing technology and other collection technologies are summarized from three aspects: collecting principle, device structure parameter optimization, and sea trial situation, and the key technical problems of hydraulic ore collection are put forward. Through the comparative analysis of the pick-up efficiency, energy consumption, environmental disturbance and other performances of different devices, it is found that the Coandă-effect-based hydraulic collection technology has better comprehensive performance. A structural design evaluation indicator for the collection head of hydraulic collection technology is proposed, and the prospect of further research on hydraulic collection technology is put forward.

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Shi, Hengbo, Jiacheng Xie, Xuewen Wang, Juanli Li, and Xing Ge. "An operation optimization method of a fully mechanized coal mining face based on semi-physical virtual simulation." International Journal of Coal Science & Technology 7, no. 1 (December 2, 2019): 147–63. http://dx.doi.org/10.1007/s40789-019-00282-3.

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AbstractA mathematical hydraulic support self-tracking model for three-machine cooperative mining is proposed to address low efficiency and difficulties in strategy evaluation of a fully mechanized coal face. The proposed model uses the coordinates and traction speed of the shearer to calculate the frequency of the circular hydraulic support and realize the coordinated operation of the three-machine mining technology. A unity3d hardware-in-the-loop simulation experimental hearer and hydraulic support platform was used to validate the model of autonomous follow-up. The results indicate that collaborative control of coal mining allowed for an efficiency 3.76% higher than under automatic operation mode and 46.03% higher than under manual control; thus, The mathematical model provided an improved production efficiency of the fully mechanized mining face. The mathematical model also provides a more intelligent and reliable security support, and improves the intelligent level of hydraulic support follow-up control.

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Hu, Min. "Research and Analysis on the Retrofit Design of Caving Coal Hydraulic Support." Advanced Materials Research 912-914 (April 2014): 915–18. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.915.

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The low caving coal hydraulic support can be transformed into standing shield hydraulic support which is mining full height in order to adapt to the change of mining conditions. On the basis of the analysis of the key elements of retrofit design, transformation practice of specific type of hydraulic support is carried out. The result shows that retrofit design is effective and has an important practical value .

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Cheng, Qingying, Bingxiang Huang, Luying Shao, Xinglong Zhao, Shuliang Chen, Haoze Li, and Changwei Wang. "Combination of Pre-Pulse and Constant Pumping Rate Hydraulic Fracturing for Weakening Hard Coal and Rock Mass." Energies 13, no. 21 (October 22, 2020): 5534. http://dx.doi.org/10.3390/en13215534.

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The weakening of hard coal–rock mass is the core common problem that is involved in the top coal weakening in hard and thick coal seams, the hard roof control during the initial mining stage in the longwall mining face, and the hanging roof control in the gob of non-coal mine. Based on the characteristics of pulse hydraulic fracturing and constant pumping rate hydraulic fracturing, a weakening method for hard coal–rock mass by combining pre-pulse and constant pumping rate hydraulic fracturing is proposed. A complete set of equipment for the combined pulse and constant pumping rate hydraulic fracturing construction in the underground coal mine is developed. The pulse and constant pumping rate hydraulic fracturing technology and equipment were applied in the top coal weakening of the shallow buried thick coal seam. Compared with no weakening measures for top coal, the average block size of the top coal caving was reduced by 42% after top coal hydraulic fracturing. The recovery rate of the top coal caving mining face reached 85%, and it increased by 18% after hydraulic fracturing.

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Wang, Li Ping, Xiao Wei Shao, Chun Yan Qiu, and Wei Min Huang. "Structure Design of the Hydraulic Support Sprag Units for Great Mining Height." Advanced Materials Research 744 (August 2013): 118–20. http://dx.doi.org/10.4028/www.scientific.net/amr.744.118.

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In this paper,the importance of controlling side fall in great mining height coal face is introduced,and the stability of great mining height coal seam,the types and characteristics of sprag units are researched. Through the study this paper designs and confirms the sprag units structure which is fit for the great mining height hydraulic supports well. Hydraulic support sprag unit structure mainly have two types: simple aticulated type and four-bar linkage type.By the analysis and comparision of the characteristic of retractable type and folding type, the folding sprag units which has better integral rigidity is selected.It also provides the methods and experience for the the design of hydraulic support ,especially for the sprag units design of great height hydraulic supports.

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Li, Ran, Wenshu Wei, Yuehua Lai, Dalong Wang, Bo Liu, and Tongcheng Wang. "Long-distance intelligent liquid supply for coal mining faces based on liquid demand prediction." Journal of Physics: Conference Series 2561, no. 1 (August 1, 2023): 012018. http://dx.doi.org/10.1088/1742-6596/2561/1/012018.

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Abstract The coal mine pump station liquid supply system adapts to changes in the main pressure for supply, but under conditions of long-distance liquid supply beyond 2000 m, there is a problem with the difficult system response to the hydraulic support liquid demand, resulting in significant pressure fluctuations in the hydraulic system and serious performance degradation of the supply system. To solve this problem, a long-distance intelligent liquid supply method based on liquid demand prediction for coal mining faces is proposed to ensure stable liquid supply. The method integrates parameters such as the mining machine’s position, the hydraulic support’s column pressure before and after the mining machine, the forward travel distance, and action codes to construct a feature vector. Based on the Transformer Model, a Liquid Demand Prediction Model for hydraulic support is established. Attention mechanisms are combined to solve the problem of time prediction for long sequences. The model is validated using real measured data from a hydraulic system in a coal mine, and the experimental results show that the model can accurately predict liquid demand and achieve long-distance intelligent liquid supply for coal mining faced by combining pump station control strategies.

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Zhang, Jiayong, Yongzhen Niu, Jian Chen, Yanlei Guo, and Liwen Guo. "Research on Deep Coalbed Methane Localized Spotting and Efficient Permeability Enhancement Technology." Applied Sciences 12, no. 22 (November 21, 2022): 11843. http://dx.doi.org/10.3390/app122211843.

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To solve the bottleneck problem of low deep coal seam permeability and difficult coalbed methane (CBM) mining. Combining hydraulic splitting technology and directional drilling technology, a directional hydraulic splitting enhancement method of deep CBM mining was proposed. The selection equation for the directional hydraulic splitting of deep coalbed was constructed. The numerical simulation reveals the variation in coal fractures around different split angles. The split angle under the maximum coal damage effect was obtained. It was found that the combined effect of the double crack damage disturbance region led to reciprocal stress fluctuations during crack development and, eventually, the formation of a zigzag fracture. The larger the splitting angle, the larger the fissure development length and the larger the coal-damaged area. A double crack takes 25% less time to complete propagation than a single crack. When the splitting angle is 90°, the disturbed area occupies 2/3 of the area around the borehole, and the overall fracturing effect is the best. In the application process, the new directional hydraulic splitting technology can increase CBM mining by 5.08%, greatly improve CBM mining efficiency, and reduce the coal mining risk, which is of great significance to the project.

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Xu, Zhi Peng, Kui Zhang, and Ri Ji. "Design of Electric-Hydraulic Control System for Hydraulic Powered Support in Fully Mechanized Mining Face." Advanced Materials Research 753-755 (August 2013): 2641–44. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2641.

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The constraint relation of three-key-equipment, including coal cutter, scraper conveyor and hydraulic support, applied in the safe, high-producing and high-efficient fully mechanized mining face, was introduced; the composition principle of electro-hydraulic control system, embedded in the hydraulic support, was discussed, and the design scheme of the composition and hardware system about the electro-hydraulic control unit was presented in this paper. And finally the scheme achieved the target that we can control and monitor the working condition in near real-time, on the ground, in the crossheading and in front of the mining face.

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Lu, Ming Xin, Ming Feng Lv, Ju Guang Wang, Min Li, Jie Zhao, Yong Yi Liu, Yang Zhao, and Jing Wang. "Intelligence Mining with Electro-Hydraulic Control Technology." Advanced Materials Research 201-203 (February 2011): 425–28. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.425.

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The underlying way to reduce accidents is reducing the number of workers on the coal face. Automatic mining can realize this object. The key for unmanned automatic mining is the application of electro-hydraulic control technology used on workface support. The electro-hydraulic control system applied in Wannian colliery has following function: Automatic moving , lowering and rising of support, monitoring and display of roof pressure; Shearer locating, controlling of cutting height and shearer speed, remote operation and procedure running; Automatic tension of conveyor chain, conveyor operation with constant power and monitoring and fault diagnosis of conveyor speed reducer.

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Spude, Robert L., and Powell Greenland. "Hydraulic Mining in California: A Tarnished Legacy." Western Historical Quarterly 33, no. 3 (2002): 366. http://dx.doi.org/10.2307/4144860.

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Sato, K., T. Isobe, N. Mori, and T. Goto. "9. Microseismic activity associated with hydraulic mining." International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 23, no. 1 (February 1986): 85–94. http://dx.doi.org/10.1016/0148-9062(86)91669-4.

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Makharadze, Leon. "Device for Protection Against Hydraulic Shocks of Multi-Stage Pressure Hydraulic Transport Systems." Works of Georgian Technical University, no. 1(527) (March 21, 2023): 109–17. http://dx.doi.org/10.36073/1512-0996-2023-1-109-117.

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Pipeline hydrotransport systems began to develop rapidly from the second half of the last century. This was especially the case in the mining and mineral industries, when it was used for hydraulic transportation of loose solid materials. One of the fragments of the fundamental works performed by the author at G. Tsulukidze Mining Institute – the construction performance and working principle of the hydraulic shock protection device of multistage pressure hydraulic transport systems – is reviewed. The construction includes a pneumohydraulic accumulator, the body of which is connected to the suction pipe of the pumping unit through a tube on which a foot is mounted, and the bottom is connected to the necessary pipeline with a transfer pipe. Additionally, reverse valves are installed on the supply pipe and the transfer pipe.

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Bilen, Branislav, Branka Bilen-Katic, and Marko Zerjal. "Some Naval Architectural Problems in Underwater Coal Mining." Marine Technology and SNAME News 31, no. 02 (April 1, 1994): 116–22. http://dx.doi.org/10.5957/mt1.1994.31.2.116.

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This paper presents a solution for a propulsion system that provides perfect speed control and maneuverability for a survey launch used in the process of underwater coal mining. First, mining aspects of coal exploitation are explained. There is also a brief technical description of a cutting wheel suction dredger, including specifications for dredging equipment. The important role of the survey launch in underwater mining procedures is outlined and technical specifications of an installed indirect diesel-hydraulic drive are given. A qualitative comparison between the diesel-hydraulic and the other conventional propulsion systems is made. Finally, some operating parameters of the diesel-hydraulic propulsion system are given through a number of diagrams recorded during trials.

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Xie, Chang Hong. "Application of Crossing Borehole Hydraulic Fracturing in Coal Mine." Advanced Materials Research 634-638 (January 2013): 3282–88. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3282.

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In order to solve technical problems which restricted coal mining operation, such as low penetrability of coal mass and low efficiency of gas extraction, according to geological mining condition of Yuyang Mine, Crossing Borehole Hydraulic Fracturing system was designed and investigated in N3704 west gas tunnel (below). The system was based on coal or rock mass hydraulic fracturing theory and gas flow theory. Through the experimental study of fracture and analysis of fracturing effect after inspection, the result of field test shows that Crossing Borehole Hydraulic Fracturing system could improve the gas extraction efficiency significantly. The test result provides a basis for hydraulic fracturing operation in other mines.

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Aleksey, Kholmskii. "The prospects of blastless ore breaking with hydraulic hammers when mining North Uralian Bauxite Mine deposits by underground method." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, no. 4 (August 21, 2022): 26–37. http://dx.doi.org/10.21440/0536-1028-2022-4-26-37.

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Research objective is to increase mining productivity at the North Uralian Bauxite Basin deposits by switching to blastless mining technology with ore breaking with hydraulic hammers. Methods of research include the analysis of current process flow schemes for the North Uralian bauxite basin deposits development, a comparative analysis of the stoping schedules in process flow schemes with drilling and blasting ore breaking and blastless breaking of the mine block reserves, determining the productivity of blastless ore breaking with hydraulic hammers, and studying the dependence between the process flow scheme efficiency and the depth of mining. Results. Stoping cyclograms in process flow schemes with ore drilling and blasting and mechanical breaking were compared for the conditions of the North Uralian Bauxite Mine (SUBR) deposits development. The dependence between the process flow schemes efficiency and the depth of mining has been established. Based on the comparative analysis results, it was determined that the process flow scheme for blastless mining at SUBR deposits is the most competitive in terms of stoping productivity and safety. The developed process flow scheme with ore breaking with hydraulic hammers provides a minimum drop in process flow scheme efficiency with an increase in the depth of mining and an increase in productivity by 1.5–2 times due to the implementation of a cyclic-flow technology for stoping. Conclusions and scope of the results. The developed process flow scheme for blastless mining at SUBR deposits with ore breaking with hydraulic hammers makes it possible to increase the productivity of stoping by 1.5–2 times without reducing the level of safety. The research results can be used to justify the switch to a blastless mining in complicated mining and geological conditions, in conditions of increased rock-bump hazard, and when stoping ground advances to deep horizons.

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Peng, Tian Hao, Mei Sheng Yang, Xiao Song Hao, and Jia Dong Liu. "Simulation Study on Load-Sensing Hydraulic Drawing System of Coal Mining Machine." Applied Mechanics and Materials 37-38 (November 2010): 1195–98. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.1195.

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A new hydraulic drawing system of coal mining machine is proposed in this paper. The variable plunger pump adopted in the hydraulic drawing system of coal mining machine is replaced by load-sensing variable displacement pump. The working principle and energy-saving of the new system are introduced. The performance of the new system is obtained by the simulation study using AMESim.

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Li, Hai Ning, and Dai An Deng. "Research on Influence Factors of Hydraulic Support Moving Velocity in Coal Mining Based on AMESim." Advanced Materials Research 1014 (July 2014): 180–84. http://dx.doi.org/10.4028/www.scientific.net/amr.1014.180.

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In view of the high efficiency modernization coal demand, in this paper, the hydraulic support moving velocity influence factors were studied. Building simulation model of the thrust jack of hydraulic support with the simulation software AMESim, and run the simulation. Comparing the simulation results by setting different parameters value. It is concluded that the rated flow of pump station and hydraulic controlled check valve opening quantity will affect the speed of hydraulic support moving frame. This result provides reference for the optimal design of hydraulic support and improving the efficiency of coal mining. Key words: Moving velocity of hydraulic support; Rated flow; Hydraulic controlled check valve; AMESim 1 Tntroduction In the process of coal mining,the movement of hydraulic support needs in a timely manner with coal mining progresses, thrust jack plays a vital role for the movement of the hydraulic support. Therefore, it is very meaningful to research the influence factors of hydraulic support moving velocity With thrust control loop as the breakthrough point . 2 The working principle of the thrust control loop The movement of the hydraulic support and push the slide are achieved by thrust jack. Thrust jack is located in the middle part of the base of the hydraulic support, its end hinged with the base of the hydraulic support, the other end is connected with flexible scraper conveyor. When the hydraulic support moving, uninstall first, then the hydraulic controlled check valve make high pressure liquid into the piston rod cavity of thrust jack, the liquid in piston chamber flow back. At the same time, make thrust jack cylinder to move forward with the support of conveyor, thus, the whole hydraulic support is pulled to the coal wall, to complete the move. when pushing the slide, make high pressure liquid into the piston chamber , the liquid in piston rod cavity flow back, and, make the piston rod out with the support of hydraulic support. so,the conveyor is pushed to the coal wall,it is completed.

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Valerii, Mirenkov. "Hydraulic fracture in the nonlinear stress field." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 4 (June 25, 2020): 12–20. http://dx.doi.org/10.21440/0536-1028-2020-4-12-20.

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Introduction. The article considers a variant of a straight finite fracture modeled by a mathematical cut in the elastic plane. Aim. The new model proposed differs from the existing models by the damage zone bounded by the elastic material at the fracture tip up to the moment of the fracture growth. The process of fracturing is essentially nonlinear. Methodology. The model is based on the full-scale tension experiments with a reference sample of rocks enclosing a fracture and having the characteristic stress points, namely, proportionality limit, elasticity limit, plasticity domain and the domain in the vicinity of destructive stresses. Results. The problem with fracture is considered as an experiment to determine deformation with growing pressure in the fracture. The problem has no correct analytical solution. The problem on hydrofracture 20 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 4. 2020 ISSN 0536-1028 assumes the presence of the initial stress field in rock mass, which is essentially used in formulation of boundary conditions. Conclusions. All such problems belong to the class of Cauchy’s problems with an infinitely distant point in the computational domain. This article proposes the correct formulation of the fracture theory problem in the static, kinematic and dynamic framework.

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30

Kosenko, Andrii, and Viktor Tarasyutin. "SUBSTANTIATION OF RATIONAL TECHNOLOGIES FOR CARRYING OUT PREPARATORY-THROWED RAIS IN THE MINING BLOCKS OF IRON MINES, WHICH ENSURE INCREASED STABILITY OF THE MASSIF EXPOSURES." JOURNAL of Donetsk Mining Institute, no. 1 (2022): 40–46. http://dx.doi.org/10.31474/1999-981x-2022-1-40-46.

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Purpose. Improving the efficiency and safety of mining operations in the process of preparatory-rifled risers, through the use of rational technological schemes of borehole hydraulic technology. Methods. Analysis of literary sources, design documentation and practice of developing mineral deposits by underground method. Designing a technological scheme for borehole hydraulic technology for preparatory-rifled risers. Technical and economic comparison of the developed technological schemes for conducting preparatory-rifled risers. Results. The results of the study were proposals for improving and increasing the efficiency of preparatory-rifled risers in the process of underground mining of rich iron ore deposits by using safe technological schemes of borehole hydraulic technology. The main areas of mining and geological conditions for the rational use of specific technologies for risers are determined. Scientific novelty. The dependences of the cost of carrying out 1 m3 of preparatory-rifled riser in different ways on its length are obtained. It has been established that for the effective destruction of low-strength martite ores by hydraulic monitors, the dynamic pressure of water jets should be 0.1–0.2 of the uniaxial compression strength of the massif. Practical implication. A technological scheme has been developed for conducting preparatory-rifled risers using borehole hydraulic technology, which allows for low-operation, flow and safety of mining operations, flexibility in controlling the concentration and volume of work, good compatibility with traditional mining technologies, as well as preliminary enrichment in the converter or open-hearth production of high-quality steel grades. Efficiency is ensured by the simplification of tunneling technology, high penetration rate, energy and material savings.

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Strelnikov, Andrew, Sergey Markov, Ludger Rattmann, and Dieter Weber. "Theoretical Features of Rope Shovels and Hydraulic Backhoes Using at Open Pit Mines." E3S Web of Conferences 41 (2018): 01003. http://dx.doi.org/10.1051/e3sconf/20184101003.

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Open coal mining companies in Kuzbass (Western Siberia, Russia) constantly face challenges to increase the economic efficiency of mining operations, reduce coal losses and increase profitability. One of the ways to increase the efficiency of open pit mining is to improve the technology for the development of coal-bearing zones of quarry fields on complex structured inclined and steep deposits. At present, the projects for promising deposits have been completed, and a number of operating open pits conduct the development of coal-bearing zones along their entire width by horizontal layers. The excavating and loading equipment for overburden and mining operations in these zones is diverse: quarry rope shovels, hydraulic backhoes or their joint work. When they work together in the coal-bearing zone, the rope shovels extracts the interbeds, and the hydraulic backhoes extract the coal seams. However, such technical solutions are not sufficiently substantiated. The fact is that rope shovels and hydraulic backhoes have their advantages and disadvantages in operating.

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32

Supriyadi, Supriyadi, Mardiah Mardiah, and Abrianto Akuan. "Optimalisasi Perencanaan Tambang Berdasarkan Pemilihan Kebutuhan Alat Berat Untuk Mencapai Target Produksi di Tambang Besar (TB 2.2) Tempilang Front 1 Kec. Tempilang Mitra PT Timah (Persero) Tbk." MINERAL 2, no. 2 (January 30, 2020): 108–15. http://dx.doi.org/10.33019/mineral.v2i2.1566.

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Mining activities in TB 2.2 TempilangSite was conducted by Bahtera Sarindo Utama as a partner of PT Timah (Persero) Tbk.The method and technology used in mining site was Mechanical Mine as an alternative of conventional open pit mining which had been applied to overcome a great lack of hydraulic mining. There were several problems occurred in tin mining activities of TB 2.2 Tempilang included less of cycle time of gravel pump per day due to several problems that appeared in mine site such as gravel pump were often broken, Front Work landslides, so the production activity was inefficient. Mine planning of Mining mechanical methods plan Mechanics in TB 2.2 TempilangSite had production target of 320 m3 / h or 5,760 m3 / day. Therefore it was necessary to optimize the mining design to make it more efficient. The study included the election needs of load haulage equipment and conveyance based fleet to achieve production targets.Based on the results obtained, the need of equipment in hydraulic mine method for IDH work Front 1 to achieve production target was4 units of hydraulic pump, 4 units of gravel pump, 3 units of Excavators and 4 units of Articular Dump Truck with the total production of 5,976 m3 / day, and if using mechanical mine methodthe needs of load haulage equipment and conveyance for IDH removal was 1 fleet, 2 units of CAT 320D2 Excavator and 6 units of CAT 740B ADT with a total production of 6588.00 m3 / day with the production rate at 9.20 % greater than hydraulic mine and fleet 2 such us 1 unit of 345D CAT Excavator and 6 units of CAT 740B ADT 6 with the total production of 6468.12 m3/ day with the production rate at 7.60% greater than hydraulic mine.Based on the results obtained, mine lifetime of TB 2.2 TempilanFront 1 was 6,13 years using hydraulic mine method, 5,57 years for Mechanical mine of fleet 1 and 5.67 years for fleet 2. From these results suggested, that would better to use mechanical mine method in the removal of IDH in TB 2.2 Tempilang. With the availability of load haulage equipments and conveyance would counduct with fleet 1.

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Zhang, Qiang, Peitao Shi, Meng Li, Tingcheng Zong, and Weijian Song. "A Design Method and Application of Backfilling Hydraulic Supports in Reforming Top-Coal Caving Hydraulic Supports." Applied Sciences 13, no. 2 (January 11, 2023): 987. http://dx.doi.org/10.3390/app13020987.

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Solid backfilling is an environmentally friendly method of coal mining. Backfilling hydraulic supports are important devices in solid backfill mining. In order to speed up the design and manufacturing process of them, this paper proposes a method of hydraulic support reformation and evaluation. The mechanical models of top-coal caving hydraulic support and backfilling hydraulic support were established to analyze the stress characteristics of the main structure. ABAQUS was used to establish the 3D numerical model to analyze the load-bearing characteristics, as well as verify the strength requirement. In addition, the structural characteristics, compaction characteristics, geological adaptation characteristics, and interference characteristics of the structure were analyzed using motion simulation. After reforming, the ramming force is just above 2.0 MPa, and the utilization ratio of the old parts of the top-coal caving hydraulic support is more than 50%, which saved the costs of the new backfilling hydraulic support and reduced the waste of idle top-coal caving hydraulic support. The successful application of the backfilling hydraulic support in the Tangshan mine showed the rationality of the reform design.

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34

Wu, Wenda, Guorui Feng, Xiuxiu Yu, Jianbiao Bai, Xiangyu Wang, and Xiangzhuo Zhao. "Investigation into Pressure Appearances and Hydraulic Fracturing Roof-Cutting Technology in Mining Working Face under Residual Pillars: A Case Study." Energies 16, no. 9 (May 5, 2023): 3914. http://dx.doi.org/10.3390/en16093914.

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Strong mining pressure disasters are prone to happen when the mining working face is under residual pillars (MWFRPs). The purpose of this study was to experimentally investigate and evaluate pressure manifestations and hydraulic fracture roof-cutting technology in the development of a working face under residual pillars using a physical model and numerical modelling tools. A scheme for hydraulic fracturing cutting technology was proposed and carried out on-site at the 31106 working face. The results show that the instability of the overlying residual pillar causes the upper thick, hard strata (THS II) to rupture and form a “T-shaped structure”. The rotation and sinking movement of the structure leads to the transmission of the dynamic load downwards, causing shear failure in the lower thick, hard strata (THS I) along the boundary of the residual pillar. The smaller the length of the THS II fracture block, the smaller the shear damage of THS I, and the lesser the mining pressure in the working face. Field trials proved that hydraulic fracture roof cutting can effectively destroy the integrity of the thick hard strata and promote their collapse, which reduces the strong dynamic load borne by the hydraulic support. This research provides a reference for safe mining at a working face under similar conditions.

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35

Zong, Tingcheng, Gaolei Zhu, Qiang Zhang, Kang Yang, Yunbo Wang, Yu Han, Haonan Lv, and Jinming Cao. "Solid Backfilling Efficiency Optimization in Coal Mining: Spatiotemporal Linkage Analysis and Case Study." Applied Sciences 13, no. 22 (November 14, 2023): 12298. http://dx.doi.org/10.3390/app132212298.

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In coal mining, solid backfilling technology is widely used. However, its efficiency is seriously hindered by the following two factors. Firstly, the process flow of the solid backfilling operation is more complicated in the back, and the spatiotemporal linkage (SPL) between actions of the cylinders powering each support and between hydraulic supports in the whole face lacks continuity. Secondly, the coal mining process in the front has a higher level of intelligence and technical maturity than the backfilling operation in the back, the latter permanently staying behind the former. To this end, the present study investigates the SPL of the mining and backfilling operations for single supports in the working and whole faces. The SPL of cylinder actions is analyzed for intelligent backfilling using hydraulic supports. We also investigate the SPL of the positions of each piece of key equipment involved in different steps of intelligent backfilling in the whole face. Formulas are derived for calculating the time required to complete the cyclic hydraulic support movement–discharge–filling operation for single supports and the whole face. The key factors influencing the time required to complete a hydraulic support movement–discharge–filling cycle are analyzed. On this basis, a backfilling efficiency optimization scheme is proposed. It envisages reducing the number of tampings and time gaps in actions of single supports and cylinders, increasing the number of hydraulic supports in parallel operation, and intelligent upgrading of the backfilling operation. These findings help synchronize coal mining and backfilling operations.

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Konovalov, Vladimir, Tatyana Yershova, and Svetlana Bedrina. "Mining and hydraulic engineering structures as commercialized facilities." E3S Web of Conferences 177 (2020): 06003. http://dx.doi.org/10.1051/e3sconf/202017706003.

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About 70 acting and inactive mining and hydraulic engineering structures containing considerable number of valuable components have been identified in the Ural mining region, suggesting that they can be viewed as man-made mineral fields. The paper studies an optional approach to identify these structures as real estate assets with their further record in the Unified State Register of Immovable Property and their commercialization.

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Zhao, Si Hai, Yu Wei Hu, Zhe Qian Zhao, Yan Chen Guo, Ji Ye Gao, and Peng Chao Zhong. "The Application of RFID at Leasing Management of Coal Mining Equipments." Advanced Materials Research 774-776 (September 2013): 1647–52. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.1647.

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Giving each hydraulic prop sets of the only equipment number is a problem of the management of coal mining equipments, the article has presented a method of using RFID technology to affix with a electronic tag for each hydraulic prop, through theoretical analysis and experimental research, basing on the equipment identification and identification distance reliability, confirm that the low frequency RFID electronic tags can be used as a hydraulic prop, and design the installation method of the hydraulic prop RFID chip. The paper also uses the C language compiled a RFID chips identification and transmission program, and use the RFID application system in the actual equipments leasing management information system.

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Zhang, Xin, Jian Wu Zhang, Qing Liang Zeng, and Cheng Long Wang. "Lightweight Design for Hydraulic Support." Key Engineering Materials 450 (November 2010): 79–82. http://dx.doi.org/10.4028/www.scientific.net/kem.450.79.

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In large inclined angle mining condition, in order to decrease the effect of sliding force, a lightweight design for hydraulic support is presented in this paper. Taking minimum mass of top beam as optimization objective, the three-dimensional model of it is built firstly. The whole top beam is simplified into top plate, side plate, bottom plate and main reinforcement on the premise of unchanging its topology configuration, and only strength constraint is chosen as constraint, which reduces the number of constraint functions and calculation cycles. By means of ANSYS zero-order optimization module, the mass of top beam is decreased about 16.9%. Finally, the optimal lightweight structure is fully evaluated under the same load as pre-optimization, and finite element analysis results prove that its stress and strain satisfy the need of strength. This lightweight design measure is used in the practical manufacturing with a lower cost of materials, which also increases the stability of hydraulic support in large inclined angle mining condition.

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39

Li, Tengda, Jiren Wang, Kun Zhang, and Chunhua Zhang. "Mechanical analysis of the structure of longwall mining hydraulic support." Science Progress 103, no. 3 (July 2020): 003685042093647. http://dx.doi.org/10.1177/0036850420936479.

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Existing studies of the structural strength of longwall mining hydraulic support are mainly focused on the force acting on individual supports instead of the general mechanical characteristics of the support group in a fully mechanized coal seam working face. This study combines theoretical analyses and experiments to investigate the mechanical characteristics of a longwall mining hydraulic support group and the stiffness of key support components under different working conditions. The theory of a beam on an elastic foundation was applied to construct a mechanical model for the hydraulic support group. The location and the size of loads on the top beam were determined. Field tests yielded data on the deflection of the roof and loading on the support group along the working face, where the stiffness of end supports varies. The transverse load distribution of the top beam and the offset loading coefficient at different locations along the working-face direction were obtained. A three-dimensional model was constructed for the support group while assembling virtual hydraulic supports using modern virtual modeling theories and methods. Finite element analysis was used to analyze the strength of the hydraulic support. The weakest areas of key components were found to be pinholes connecting the column cylinder to the base and roof of the mine. These results can be applied to achieve secure and stable operations of hydraulic supports in the working face of a thin coal seam, thereby improving the safety and production efficiency of mining operations.

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Li, Cong, Xiangang Yin, Jing Xie, and Gaoyou Peng. "The characteristics of mining induced stress fluctuations in broken rock mass over one kilometer deep coal mine." Thermal Science 23, Suppl. 3 (2019): 843–51. http://dx.doi.org/10.2298/tsci180621119l.

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Mine pressure is critical to the safety of working face. Evaluating the working resistance accurately of the stope hydraulic supports is one of the most effective and direct ways to reflect the overall stress characteristics of the roof and the defor?mation, movement and destruction of overlying strata. Due to the complex breaking form of the roof, the working resistance of the hydraulic supports at different positions of the mining face varies in different ways. One can obtain the pressure of hydraulic support system by pressure monitoring and analyze its fractal characteristics. Through spectrum analysis, a new parameter called accumulation power spectral density is defined which is used to describe the difference of working resistance of stope hydraulic supports. The results show that the fractal dimensions of face-end supports are smaller and face-end supports are unco-ordinated. Through in-situ monitoring, it is found that the mining stress has unstable periodic fluctuation characteristics. The conclusion can provide reference for rational selection and optimization of the similar-mining lay-outs.

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Burakov, A. M., S. V. Panishev, E. L. Alkova, and D. V. Khosoev. "Experience of using hydraulic excavators in difficult mining, geological and climatic conditions." Mining Industry Journal (Gornay Promishlennost), no. 2/2022 (May 6, 2022): 90–96. http://dx.doi.org/10.30686/1609-9192-2022-2-90-96.

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The article summarizes the experience of using hydraulic excavators in coal, diamondiferous and other mining operations. It is noted that the excavation capacity of modern hydraulic excavators is several times higher than that of the mechanical shovels, and the hydraulic equipment is more suitable for non-explosive excavation in hard grounds, including halfrock formations. It is shown that even in difficult mining, geological and climatic conditions in coal, diamondiferous and other mines, the use of hydraulic excavators in Russian mining companies is justified by high efficiency and high availability ratio equal to the international indicators, which are not lower than those achieved in much more favorable conditions. Research performed in industrial settings made it possible to determine the hydraulic drive's service mode and regulations, as well as rational operating conditions. Operating systems were developed with heated working fluids to compensate for the changing viscosity at low atmospheric temperatures. Based on the tests performed in Russia and abroad, blast-free excavation using hydraulic excavators is done with limited capacity (up to 400 m3/h), and the operating weight of the machines must be not less than 300 tons. The main factors, typical for operation of the open-pit hydraulic excavators include the high annual production time, high forces and dynamics (up to 70 kN per 1 m3 of the bucket capacity) in the digging mode of the unit working at the face, high specific capacity and remoteness from the outside infrastructure used for repairs of the hydraulic components. In the course of testing the hydraulic excavators, the boundary values of the face slope angle depending on the ambient temperature were established. It was experimentally proved that at top to bottom layer-by-layer excavation with the H-285S hydraulic shovel the face height can reach up to 25 m at the rated digging height of 16 m. The average lump size (not more than 300 mm) of the rock mass in a 19 m3 bucket was determined with the permissible oversize in the face up to 2,500 mm. With the normal maintenance quality, the weighted average cost of operation for electromechanical excavators and the corresponding figures for hydraulic excavators are at a comparable level.

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42

Ye, Tie Li, and Jiao Peng. "Finite Element Analysis of Large Mining Height Hydraulic Support Top Beam." Applied Mechanics and Materials 740 (March 2015): 104–7. http://dx.doi.org/10.4028/www.scientific.net/amm.740.104.

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In this paper, Solid works software and finite element analysis software ANSYS workbench combined for ZY10000/26/55 type two columns shield large mining height hydraulic support top beam finite element modeling, through the mathematical model analysis to determine the mechanical load, and then using ANSYS software to analyze the stress and displacement law by three conditions: both ends of the beam in concentrated load, unilateral loads and torsional loads. In this way, we know the stress and displacement of hydraulic support beam after the distribution of load, for stress concentration, which make rationalization proposals on large mining height hydraulic support design, we recommend reinforcing ribs, increasing cover thickness or using higher strength material (Q460) and providing a reference in other measures to improve the strength and stiffness of the hydraulic support top beam.

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Kutepov, Yuriy, Aleksandr Mironov, Maksim Sablin, and Elena Borger. "Substantiation of Safe Conditions During Undermining of Hydraulic Waste Disposal." E3S Web of Conferences 41 (2018): 01007. http://dx.doi.org/10.1051/e3sconf/20184101007.

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This article considers mining and geological conditions of the site “Blagodatny” of the mine named after A.D. Ruban located underneaththe old open pit coal mine and the hydraulic-mine dump. The potentially dangerous zones in the undermined rock mass have been identified based onthe conditions of formation of water inflow into mine workings. Safe depthof coal seams mining has been calculated depending on the type of water body – the hydraulic-mine dump.

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Cheng, Yuxiang, and Yanjun Zhang. "Experimental Study of Fracture Propagation: The Application in Energy Mining." Energies 13, no. 6 (March 18, 2020): 1411. http://dx.doi.org/10.3390/en13061411.

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Hydraulic fracturing has been widely used in recent years as a key technology to improve energy mining efficiency in petroleum and geothermal industries. Laboratory hydraulic fracturing experiments recently were completed in six large-scale 300 × 300 × 300 mm rock specimens to better understand this complex process of hydraulic fracturing. When injection flow rate increases from 5 to 30 mL/min. The fracture initiation pressures and breakdown pressures increase, the propagation times and post-fracturing pressures decrease. The fracture geometries are observed and analyzed, mean injection power is proposed and results show that it could be used to roughly estimate the fracture total lengths. Moreover, the fracture permeabilities based on the pressure data are calculated and linearly ascend with the increase of injection flow rates. These results can provide some reasonable advice for implementing hydraulic fracturing reservoir simulations and improving energy production efficiency on application to field-scale operation.

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45

Minns, Anthony W. "Subsymbolic methods for data mining in hydraulic engineering." Journal of Hydroinformatics 2, no. 1 (January 1, 2000): 3–13. http://dx.doi.org/10.2166/hydro.2000.0002.

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This paper describes the results of experiments with artificial neural networks (ANNs) and genetic programming (GP) applied to some problems of data mining. It is shown how these subsymbolic methods can discover usable relations in measured and experimental data with little or no a priori knowledge of the governing physical process characteristics. On the one hand, the ANN does not explicitly identify a form of model but this form is implicit in the ANN, being encoded within the distribution of weights. However, in cases where the exact form of the empirical relation is not considered as important as the ability of the formula to map the experimental data accurately, the ANN provides a very efficient approach. Furthermore, it is demonstrated how numerical schemes, and thus partial differential equations, may be derived directly from data by interpreting the weight distribution within a trained ANN. On the other hand, GP evolutionary force is directed towards the creation of models that take a symbolic form. The resulting symbolic expressions are generally less accurate than the ANN in mapping the experimental data, however, these expressions may sometimes be more easily examined to provide insight into the processes that created the data. An example is used to demonstrate how GP can generate a wide variety of formulae, of which some may provide genuine insight while others may be quite useless.

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IWAMI, Hiroyuki. "Design of Large Size Hydraulic Excavator for Mining." Journal of the Society of Mechanical Engineers 107, no. 1024 (2004): 165–67. http://dx.doi.org/10.1299/jsmemag.107.1024_165.

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XIA, Bairu, Xiping ZENG, and Zhixin MAO. "Research on One Borehole Hydraulic Coal Mining System." Earth Science Frontiers 15, no. 4 (July 2008): 222–26. http://dx.doi.org/10.1016/s1872-5791(08)60057-3.

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Panteleev, V. G., A. V. Bodrova, and G. A. Chugaeva. "Characteristics of mining quarries on hydraulic-fill dumps." Hydrotechnical Construction 24, no. 6 (June 1990): 370–72. http://dx.doi.org/10.1007/bf01433311.

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49

Han, Meng, and Lei Xie. "A Multi-Body Kinetics Intelligent Simulation Based Design Method for Hydraulic Support." Advanced Materials Research 753-755 (August 2013): 876–79. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.876.

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Hydraulic support is important supporting equipment in fully mechanized coal mining. Its working performance and efficiency have relatively big effect for the efficiency of coal mining. Aiming at the characteristics of dynamic requirements, parametric design and simulation analysis of the hydraulic support, a multi-body kinetics based hydraulic support intelligent simulation design and analysis method is proposed. The three dimensional model of the support is set up with Solidworks, and then the 3D modeling is converted to ADAMS software for motion simulation. Some key components in the model are imported to ANSYS software to perform the finite element analysis to acquiring the optimized design variables.

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Zhang, Xi, Yan Yan Wang, Ya Bin Cui, Miao Yu, and Zhi Min Zhao. "Opened Performance of Hydraulic Support Electro-Hydraulic Valve Test Bench Design." Advanced Materials Research 834-836 (October 2013): 1619–22. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1619.

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A new performance test system is presented in this paper, as we all known, hydraulic support is the most important equipment in mechanized coal mining. Electric hydraulic valve, as the key components, consist of electromagnetic pilot valve and mechanical valve bodies. When electromagnetic pilot valve hasnt enough driving force, precursor core wont work normally. The test stand can measure relationship between displacement and force of electromagnetic pilot valve. First of all, electric hydraulic valve is introduced simply, then detailed designing process. The test Bench includes measurement and control system, as well as working theory.

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Journal articles on the topic 'Hydraulic mining'

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