Relevant bibliographies by topics / Panel/pillar mining method

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Panel/pillar mining method'

Author: Grafiati
Published: 11 December 2022
Last updated: 25 January 2023

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Journal articles on the topic "Panel/pillar mining method"

1

Xu, Qingyun, Jian-Biao Bai, Shuai Yan, Rui Wang, and Shaoxu Wu. "Numerical Study on Soft Coal Pillar Stability in an Island Longwall Panel." Advances in Civil Engineering 2021 (January 29, 2021): 1–13. http://dx.doi.org/10.1155/2021/8831778.

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Roadway support and management of longwall panels in an island soft coal panel are always difficult work. In a test mine, stress distribution, deformation characteristic, and plastic zone distribution around the roadway and coal pillars in the development and mining periods were investigated with respect to the widths of different coal pillars using theoretical and simulation methods. The most reasonable width of coal pillars was comprehensively determined, and the field test was conducted successfully. The results show that a reasonable width of coal pillars is 7.0–8.2 m using the analytical method. The distribution of vertical stress in the coal pillars showed an asymmetric “double-hump” shape, in which the range of abutment pressure was about 26.0–43.0 m, and the roadway should be laid away from stress concentration. When the coal pillar width is 5.0–7.0 m, deformation of the roadway is half that with 8.0–10.0 m coal pillar in the development and mining period. The plastic zone in the surrounding rock firstly decreases and increases with increasing coal pillar width; the smallest range occurs with a coal pillar width of 5.0 m. Finally, a reasonable width for coal pillars in an island panel was determined to be 5.0 m. Industrial practice indicated that a coal pillar width of 5.0 m efficiently controlled deformation of the surrounding rock, which was an important basis for choosing the width of coal pillars around gob-side entries in island longwall panels with similar geological conditions.
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Sidorenko, Andrey, Vyacheslav Alekseev, and Vladimir Ivanov. "Numerical analysis of inter-panel pillars in the bump prone conditionals of the Alardinskaya mine." E3S Web of Conferences 326 (2021): 00009. http://dx.doi.org/10.1051/e3sconf/202132600009.

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The purpose of the paper is to substantiate the width of the barrier and yield pillars for the application of a new seam development scheme in the conditions of the Alardinskaya mine (Russia). The Alardinskaya mine develops gas-bearing coal seams that are prone to spontaneous combustion and are hazardous due to rock bumps, which leads to frequent accidents. The analysis of the world experience of mining seams being hazardous to rock bumps showed that safe mining with longwalls can be provided by a system of inter-panel pillars: very wide barrier pillar and two yield pillars. Numerical modeling using the finite element method was carried out to assess the possibility of reducing the barrier pillar width in order to decrease the volume of coal losses in the subsoil. The model of rock massif was created in Ansys mechanical software. Numerical modeling of the longwall panel development with longwalls was carried out at various widths of broad and yield pillars. The analysis outcomes of the vertical stresses diagrams in the seams are presented for different parts of the longwall panel. The rational parameters of the pillar system, ensuring the minimization of the reference pressure influence from the previously worked-out column and the reference pressure of the operating longwall, are determined as a result of numerical analysis. The conclusion is made about the expediency of the technological scheme application proposed by the authors in the conditions of the Alardinskaya mine to reduce the endogenous fire hazard and the danger of rock bumps.
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Jiang, Bangyou, Hongguang Ji, Long Fu, Shitan Gu, Tong Zou, and Jiaxin Lu. "Research on Evaluation Index and Application of Rockburst Risk in Deep Strip Mining." Shock and Vibration 2020 (September 8, 2020): 1–10. http://dx.doi.org/10.1155/2020/8824323.

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The practice shows that deep strip mining induces rockburst disaster easily. Accurately evaluating rockburst risk of the strip coal pillar is of great significance for ensuring the safety of deep strip mining. In this paper, the catastrophe mechanics model was used to analyze the abrupt instability condition of strip coal pillar. And the three indicators that are the medium stiffness ratio (k) of the elastic and plastic zone in the coal pillar, the plastic zone width ratio (aY), and the elastic deformation index (Uq) of core zone were put forward with considering the geometry size of coal pillar. Based on the 3202 panel of Gucheng Coal Mine, the evolution characteristics of rockburst risk of coal pillar under different mining widths and coal pillar widths were studied by numerical simulation. The evaluation result shows that the strip coal pillar of the 3202 panel is in danger of strong rockburst, which is more in line with the actual situation than the results of the traditional rockburst tendency identification test and comprehensive index method. These three indicators can be regarded as important indicators to evaluate the rockburst risk in the strip mining engineering field. Based on that, the design principle of strip mining in Gucheng Coal Mine was put forward, which is considered an important reference for similar cases.
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Liu, Shuaigang, Jianbiao Bai, Xiangyu Wang, Bowen Wu, and Wenda Wu. "Mechanisms of Floor Heave in Roadways Adjacent to a Goaf Caused by the Fracturing of a Competent Roof and Controlling Technology." Shock and Vibration 2020 (May 19, 2020): 1–17. http://dx.doi.org/10.1155/2020/5632943.

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In traditional sequential single-wing mining practices, one-entry longwall mining systems make it challenging to efficiently and smoothly transfer mining equipment during a continuous mining sequence. In two-entry longwall systems, the headgate of the current panel and the tailgate of the next panel are excavated parallel to one another, effectively creating space for the transfer of mining equipment. The tailgate of the panel, however, is subjected to high-mining-induced stresses, causing severe floor heave, which seriously affects the efficiency of coal production. In this paper, field measurements and numerical simulation methods are used to reveal the mechanism of floor heave induced by the rupture and instability of a competent roof. The results show that the positional relationship between the adjacent tailgate and the longwall face is divided into three stages. Throughout the three stages, the area in which the coal pillar is not horizontally displaced moves from the center of the pillar to the goaf, and the area of peak vertical stress within the coal pillar shifts from the center of the pillar to the side nearest to the tailgate. Field studies suggest that the proposed technologies can effectively control floor heave in the tailgates of two-entry longwall mining systems.
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Yu, Yihe, Liqiang Ma, and Dongsheng Zhang. "Characteristics of Roof Ground Subsidence While Applying a Continuous Excavation Continuous Backfill Method in Longwall Mining." Energies 13, no. 1 (December 23, 2019): 95. http://dx.doi.org/10.3390/en13010095.

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Activities of traditional longwall mining will result in ground subsidence and therefore cause issues such as damages to buildings and farmlands, water pollution and loss, and potential ecological and environmental problems in the mining region. With advantages of the longwall backfill mining method, as well as the room and pillar mining method, a continuous excavation and continuous backfill (CECB) method in longwall mining is recommended to effectively control the ground subsidence. In this method, mining roadways (MRs) are initially planned in a panel, and then they are excavated and backfilled in several stages until the whole panel is mined out and backfilled. According to the geologic conditions of an underground coal mine, and the elastic foundation beam theory, a mechanical model was built to study the subsidence of the roof while using this new mining method. In addition, methods to calculate roof subsidence in various stages in CECB were also provided. The mechanical parameters of backfilling materials, which were used in the theoretical calculation and the numerical analysis for mutual check, were defined through analyzing the stability conditions of the coal pillars and the filling bodies. The control effect for the ground subsidence of using the newly proposed mining method was analyzed based on both simulation results and site monitoring results, including the ground subsidence, horizontal displacement, tilt, curvature and horizontal strain. This research could provide suggestions to effectively control ground subsidence for a mine site with similar geologic conditions.
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Wu, Rui, Qingyuan He, Joung Oh, Zecheng Li, and Chengguo Zhang. "A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems." Energies 11, no. 8 (August 10, 2018): 2084. http://dx.doi.org/10.3390/en11082084.

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The gob-side entry layout is popular at two-entry longwall mine sites in China for the benefit of improving the coal recovery rate. Currently, two methods have been widely used to develop gob-side entries, including gob-side entry retaining and gob-side entry driving. Gob-side entry retaining maximizes the recovery rate by pillarless mining but increases the difficulty in gob-side entry support. Also, this method has limited applications in hard roof conditions. The gob-side entry driving mine site uses the rib pillar to separate the gob entry and the gob area of the previous panel, which leads to additional coal losses. The waste is more intolerable in large-cutting-height panels and longwall top coal caving panels as the Chinese government limits the minimum recovery rate of longwall panels using these mining methods. In this paper, a new gob-side entry layout method, termed gob-side pre-backfill driving, is established to overcome the shortcomings of the existing methods. The new method eliminates rib pillar losses and enhances gob-side entry stability. The feasibility of gob-side pre-backfill driving is studied by numerical modelling and a field trial at Changcun Mine in China. The results indicate that gob-side pre-backfill driving is an alternative for gob-side entry development. This method is practical and also has the potential to bring significant economic benefits to the mining industry.
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Wang, Feng, Shaojie Chen, Jialin Xu, and Mengzi Ren. "New Method to Design Coal Pillar for Lateral Roof Roadway Based on Mining-Induced Stress: A Case Study." Advances in Civil Engineering 2018 (October 24, 2018): 1–13. http://dx.doi.org/10.1155/2018/4545891.

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The traditional method to design coal pillar for lateral roof roadway was established based on the mining-induced strata movement contour which is considered as a straight line, while ignoring the variations of the internal strata deformation law as well as stress distribution characteristics. In order to make up for this deficiency, in this study, evolution of mining-induced stress in the overlying strata was simulated using physical and numerical simulations, and a method to design coal pillar for lateral roof roadway based on mining-induced stress was proposed. The results indicate that the stress of the overlying strata is redistributed during excavation, and the stress distribution can be divided into a stress-relaxation area, a stress-concentration area, and an in situ stress area. The contour line of 1.05 times the in situ stress is used to define the mining-induced stress contour. Stress inside the contour is redistributed while outside the contour the overlying strata are still within the in situ stress area. Mining-induced stress contour presents a concave-upward type from coal seam to the overlying strata that cannot be merged into a straight one due to their different characteristics of movement and deformation. With this in mind, this study proposed a method to design the width of coal pillar for lateral roof roadway according to the mining-induced stress contour. According to mining-induced stress contour, the width of coal pillar for lateral roof roadway of longwall panel 31100 is 160 m, and the maximum deformation of the roadway is 270 mm. The new method can definitely meet engineering demands.
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Krukovskyi, Oleksandr, Yurii Bulich, Serhii Kurnosov, Oleksii Yanzhula, and Vladimir Demin. "Substantiating the parameters for selecting a pillar width to protect permanent mine workings at great depths." IOP Conference Series: Earth and Environmental Science 970, no. 1 (January 1, 2022): 012049. http://dx.doi.org/10.1088/1755-1315/970/1/012049.

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Abstract Application of a method to protect permanent mine workings by large pillars requires thorough analysis of geomechanical processes aimed at providing stability for a mine working during its long-term operation. The purpose of the paper is to study the processes of coal rock mass deformation to substantiate the selection of the protective pillar width. The examples to be considered are represented by mining-geological conditions of a central panel of PJSC Colliery Group “Pokrovske” where four permanent mine workings are planned to be driven. To substantiate the width of protective pillars, geomechanical stability of mine workings have been assessed in terms of the effect of stoping operations of the adjacent longwalls of the block and beyond their effect. It has been shown that insufficient dimensions of a support pillar result in considerable influence of stoping operations on the stability of permanent mine workings. Along with the increasing dimensions of a support pillar, the pressure in the rocks around the permanent inclined mine workings decreases, and the support load decreases as well. In terms of the appropriate dimension of the support pillar, the boundaries of the effect become smaller; the bolting and frame support provides completely the required mine working stability.
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Bilash Prajapati, Ram, Rabindra Kumar Sinha, R. N. Gupta, Sikandar Kumar, and Deepti Prajapati. "Artificial Intelligence Model for Prediction of Local and Main FALL in caving Panel of Bord and Pillar Method of Mining." Journal of Mines, Metals and Fuels 70, no. 4 (June 20, 2022): 171. http://dx.doi.org/10.18311/jmmf/2022/30018.

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Depillaring with caving method of mining is a common practice in Indian coalfields and so is the occurrence of fall in goaf area, which can be considered as a boon in disguise as it allows wining of coal from large reserves but this becomes a curse just because of its unpredicted occurrence. Various empirical and statistical models are developed after idealization of several complicated mechanisms but they are not able to predict roof fall accurately especially in caving panels. Therefore, a new approach based on Artificial Intelligence is used to predict the sequence of local and main fall in caving panel taking into account a host of geotechnical and mining parameters of the mine. Mathematical equations and hidden calculations of artificial neural networks are known to have the capability of learning and analyzing records endlessly. Two different models have been deployed after optimal hyper parameter optimization to predict the occurrence of fall and to characterize the nature of fall (local or main) with considerable and reliable accuracy.
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Li, Yang, Yuqi Ren, Nan Wang, Junbo Luo, Na Li, Yikun Liu, and Guoshuai Li. "A Novel Mining Method for Longwall Panel Face Passing through Parallel Abandoned Roadways." Shock and Vibration 2021 (June 14, 2021): 1–10. http://dx.doi.org/10.1155/2021/9998561.

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Mining pressure behavior in the process of longwall panel face passing through the parallel abandoned roadways (PARs) is different from the ordinary longwall panel face. It is easy to induce the accident of roof falling, coal wall spalling, and crush accident of shield. In order to reduce the occurrence of mine pressure accidents and ensure safe mining, a new mining method named “swing-inclined” mining method was proposed and was employed in the E13103 of Cuijiazhai coal mine. Based on the process of the longwall panel face passing through the PARs, a long-span and multisupport mass-structure model of the roof was established. The maximum support capacity of shield was calculated combined with stability relation between “roof-shield-PAR-‘similar pillar (SP)’-coal wall.” It provided the basis for determining the reasonable support capacity of shield. Moreover, the sensitivity analysis of influenced factors to the maximum support capacity of shield was carried out by using Matlab software. The sensitivity analysis results indicated that different factors had a different effect on the support capacity of shield. And, the process of passing through the PARs can be divided into 3 stages, depending on the relation between support capacity of shield and width of SP. In different stages, the change degree of support capacity of shield was different. The support capacity of shield is mainly influenced by the hanging distance of the main roof and the horizontal distance between the support point of the coal wall and the breaking position of the main roof. By on-site measurement, the sensitivity analysis results were verified.
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Dissertations / Theses on the topic "Panel/pillar mining method"

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Misich, Ian J. "Subsidence prediction and mine design for underground coal mining in the Collie Basin." Thesis, Curtin University, 1997. http://hdl.handle.net/20.500.11937/88.

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The subsidence characteristics of the Collie Basin sediments have been investigated to provide site specific design criteria for the Wongawilli method of coal extraction. As historical coal extraction (bord and pillar) methods did not generally give rise to large scale subsidence, there were very few details on mining subsidence in the Collie Basin available to base any design methodology on. Consequently, the investigation was conducted on a Green fields basis. Firstly, the mechanisms involved in the development of mining subsidence needed to be investigated and identified. It was then necessary to determine the effects that mining subsidence would have on mine and ground mass (specifically aquitards) structures and surface features. Once these two areas of work were completed, design criteria were formulated to manage the effects of mining subsidence by controlling the critical mechanisms of subsidence development.The results from this study have greatly enhanced the level of understanding of the subsidence mechanisms involved, and allowed for the development of predictive models which can be used for the design of coal extraction by the panel/pillar mining method in the Collie Basin. Mine planning engineers can now use this design information to derive the most cost effective methods for the extraction of coal within the Collie Basin.
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Misich, Ian J. "Subsidence prediction and mine design for underground coal mining in the Collie Basin." Curtin University of Technology, School of Civil Engineering, 1997. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=12359.

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The subsidence characteristics of the Collie Basin sediments have been investigated to provide site specific design criteria for the Wongawilli method of coal extraction. As historical coal extraction (bord and pillar) methods did not generally give rise to large scale subsidence, there were very few details on mining subsidence in the Collie Basin available to base any design methodology on. Consequently, the investigation was conducted on a Green fields basis. Firstly, the mechanisms involved in the development of mining subsidence needed to be investigated and identified. It was then necessary to determine the effects that mining subsidence would have on mine and ground mass (specifically aquitards) structures and surface features. Once these two areas of work were completed, design criteria were formulated to manage the effects of mining subsidence by controlling the critical mechanisms of subsidence development.The results from this study have greatly enhanced the level of understanding of the subsidence mechanisms involved, and allowed for the development of predictive models which can be used for the design of coal extraction by the panel/pillar mining method in the Collie Basin. Mine planning engineers can now use this design information to derive the most cost effective methods for the extraction of coal within the Collie Basin.
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Al-Azem, R. A. M. "Evaluation of mine roof stability by microseismic/acoustic meter and detection of concealed caverns beneath room and pillar mine workings by the gravity method." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232910.

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Sherizadeh, Taghi. "Assessment of Roof Stability in a Room and Pillar Coal Mine in the U.S. Using Three-Dimensional Distinct Element Method." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/579111.

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Roof falls and accumulation of dangerous gasses are the most common hazards in any underground coal mine. Different mechanisms can jeopardize the stability of the roof in underground excavations and successful roof control can only be obtained if the failure mechanism is identified and understood properly. The presence of discontinuities, the inherent variability of the rock mass and discontinuity properties, and the uncertainties associated with directions and magnitudes of the in-situ stress makes the rock engineering problems challenging. The numerical modeling can assist the ground control engineers in designing and evaluating the stability of the underground excavations. If extensive geological and geotechnical data are available, then detailed predictions of deformation, stress and stability can be accomplished by performing numerical modeling. If not, still the numerical modeling can be used to perform parametric studies to gain insight into the possible ranges of responses of a system due to likely ranges of various parameters. The parametric studies can help to identify the key parameters and their impact on stability of underground excavations. The priorities of the material testing and site investigation can be set based on the selected key parameters from parametric studies. An underground coal mine in western Pennsylvania is selected as a case study mine to investigate the underlying causes of roof falls at this mine. The immediate roof at the case study mine consists of laminated silty shale, shale, or sandstone that changes from area to area, and the floor is shale or soft fireclay. This study was mainly focused in the stability analysis of the roofs with the laminated silty shale rock type, where the majority of roof falls had taken place in the roof with this type of roof material. Extensive laboratory tests were performed on the core samples obtained from the case study mine to estimate the intact rock and discontinuity properties of the materials that occur in large extent at the selected interest area of the case study mine. In this research, the three-dimensional distinct element method was used to investigate the stability of the roof in an underground room-and-pillar coal mine. The implemented technique was able to accurately capture the failure of the major discontinuities and rock masses which consist of intact rock and minor discontinuities. In order to accurately replicate the post failure behavior of the rock layers in the immediate roof area, the strain-softening material constitutive law was applied to this region. Extensive numerical parametric studies were conducted to investigate the effect of different parameters such as the variation of immediate roof rock mass strength properties, variation of discontinuity mechanical properties, orientations and magnitudes of the horizontal in-situ stresses, and the size of pillars and excavations on stability of the excavations. The distribution of post failure cohesion along with other measures such as accumulated plastic shear strain, distribution of Z-displacements at the roofline, failure state (joint slip and tensile failure) and displacement (normal and shear displacements) of discontinuities were used to accurately assess the roof stability in this case study. The research conducted in this dissertation showed that the bedding planes play an important role on the behavior of roof in underground excavations. Therefore, an appropriate numerical modeling technique which incorporates the effect of discontinuities should be employed to simulate the realistic behavior of the discontinuous rock masses such as the layered materials in roof strata of the underground coal mines. The three-dimensional distinct element method used in this research showed the clear superiority of this technique over the continuum based methods.
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Yu-TzuTsai and 蔡玉慈. "A Study of Customer Value Analysis on LCD Panel After-Sale Service by Data Mining Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/54939552208009345840.

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碩士
國立成功大學
工學院工程管理碩士在職專班
100
The TFT-LCD (Thin Film Transistor-Liquid Crystal Display) industry of Taiwan has been owned an important role in the worldwide international market. Nevertheless, its customer relationship management is still applying the practical experience approach with no maturity methods. The technical services of the TFT-LCD industry belong in a tightly mutual interaction model with the customers. However, in the era of the low product profit, a higher customer interaction industry with the breakthrough mass production technology, its price will be decreased gradually year by year. Therefore, a study of customer value analysis on TFT-LCD panel after-sale service is quite importance. Thus, the satisfied needs of the customers will be fulfilled and their difficult problems can be solved. After-sale service is the last item in the customer relationship management. The proposed OLAP method has been studied to find out the major factors affecting customer value of the TFT-LCD industry by running the decision tree analysis. We applied data mining technique to understand and forecast quickly for the customer value items. Thus, it can be changed and viewed from the cost unit rather than profit one. We studied and collected the relative items from TFT-LCD of after-sale service data firstly. We preprocessed and transferred them into data warehouse to fit the computation of the data mining technique secondly. Meanwhile, we also matched up the original Manufacturing Executive System database to build the C4.5 decision tree and running by WEKA software package. Some rules of the decision tree are discovered for affecting customer value of the TFT-LCD industry. It provided a reference model for making an appropriate decision for every product and customer within shorten time including market profitability, quality status and maintenance cost. Finally, the study will provide some valuable ideas for the TFT-LCD industry in forecasting and monitoring strategies as well as investment decision making.
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Book chapters on the topic "Panel/pillar mining method"

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Fengyu, Ren, and Xu Kuangdi. "Sublevel Caving Method Without Sill Pillar." In The ECPH Encyclopedia of Mining and Metallurgy, 1–3. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0740-1_342-1.

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Sheorey, P. R., and S. K. Singh. "Non-Effective Width Extraction and Goaf Pillar Method for Subsidence Control." In Ground Control in Mining, 35–42. CRC Press, 2020. http://dx.doi.org/10.1201/9781003078005-4.

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"Figure 7. Diagram of two-phase, room-and-pillar method." In International Mining Forum 2004, New Technologies in Underground Mining, Safety in Mines, 171–79. CRC Press, 2004. http://dx.doi.org/10.1201/9780203024133-52.

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"Optimization of room-and-pillar method parameters under conditions of limestone rocks." In Progressive Technologies of Coal, Coalbed Methane, and Ores Mining, 523–28. CRC Press, 2014. http://dx.doi.org/10.1201/b17547-86.

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"Figure 5. Diagram of J-S room-and-pillar method with roof caving Figure 6. D-P room-and-pillar method with hydraulic backfill. Way of driving the workings at the mining face." In International Mining Forum 2004, New Technologies in Underground Mining, Safety in Mines, 170. CRC Press, 2004. http://dx.doi.org/10.1201/9780203024133-51.

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"Study of rock displacement with the help of equivalent materials using room-and-pillar mining method." In Geomechanical Processes during Underground Mining, 39–44. CRC Press, 2012. http://dx.doi.org/10.1201/b13157-7.

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Nikolaev, N., and V. Parushev. "A method for analyzing and designing frictional rock bolting systems in room-and-pillar mining." In Mine Planning and Equipment Selection 2000, 349–53. Routledge, 2018. http://dx.doi.org/10.1201/9780203747124-66.

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"The influence of sealing abandoned areas on climatic conditions in the room and pillar extraction method in copper mining." In Mine Safety and Efficient Exploitation Facing Challenges of the 21st Century, 53–62. CRC Press, 2010. http://dx.doi.org/10.1201/b11761-9.

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Korini, Thoma, and George N. Panagiotou. "Rib pillar stability analysis associated with change of the mining method in an underground coal mine — A case study." In Mine Planning and Equipment Selection 1997, 161–66. CRC Press, 2020. http://dx.doi.org/10.1201/9781003078166-26.

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Dikshit, M. P. "Exploration of mining method for coal extraction in developed bord and pillar property by powered support long wall equipment." In Innovative Exploration Methods for Minerals, Oil, Gas, and Groundwater for Sustainable Development, 17–28. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-823998-8.00003-x.

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Conference papers on the topic "Panel/pillar mining method"

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Wardana, Novandri, and R. Andy Erwin Wijaya. "Analysis Of Block Stability For Room And Pillar Coal Mining In Pillar Panel Using Numerical Methods." In Proceedings of the 2nd International Conference on Industrial and Technology and Information Design, ICITID 2021, 30 August 2021, Yogyakarta, Indonesia. EAI, 2021. http://dx.doi.org/10.4108/eai.30-8-2021.2311511.

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Lee, Dong Ha, Phong Nguyen Ha, and Dong Won Jung. "Design optimization of pillar inner left right panel using FEA method." In 2016 IEEE International Conference on Intelligent Transportation Engineering (ICITE). IEEE, 2016. http://dx.doi.org/10.1109/icite.2016.7581333.

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Hormazabal, Esteban, Rodolfo Alvarez Gonzalez, and Cristóbal Valderrama. "A simplified geotechnical risk-based approach for extraction level pillar design in Block/Panel caving mines." In MassMin 2020: Eighth International Conference & Exhibition on Mass Mining. University of Chile, Santiago, 2020. http://dx.doi.org/10.36487/acg_repo/2063_21.

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Jirankova, Eva. "EVALUATION OF SURFACE SURVEYINGS REALIZED IN REGION UNDER THE INFLUENCE OF MINING METHOD ROOM AND PILLAR." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/2.2/s09.097.

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Onica, Ilie. "FINITE ELEMENT METHOD ANALYSIS OF THE CROWN PILLAR STABILITY IN THE CASE OF THE RO?IA POIENI COPPER DEPOSIT." In 13th SGEM GeoConference on SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING. Stef92 Technology, 2013. http://dx.doi.org/10.5593/sgem2013/ba1.v1/s03.034.

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Elmo, Davide, Stephen Rogers, Richard Beddoes, and Alex Catalan. "An integrated finite/discrete element method – discrete fracture network synthetic rock mass approach for the modelling of surface subsidence associated with panel cave mining at the Cadia East underground project." In Second International Symposium on Block and Sublevel Caving. Australian Centre for Geomechanics, Perth, 2010. http://dx.doi.org/10.36487/acg_rep/1002_9_elmo.

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Yang, Junyi, Hugo E. Camargo, and David S. Yantek. "Sound Radiation Analysis of a Longwall Cutting Drum." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64530.

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Operators of longwall mining systems experience sound levels of 93–105 dB(A) and receive noise exposures that place them at risk of noise-induced hearing loss. To address the problem, the National Institute for Occupational Safety and Health (NIOSH*) Office of Mine Safety and Health Research (OMSHR) has conducted research to develop engineering noise controls for longwall systems. In previous field surveys, the sound radiated by the cutting drums was identified as a major hazard, especially considering their close proximity to the operators. Cutting drums are complex structures consisting of curved metal pieces welded together, and NIOSH has used modeling and simulation to characterize the acoustic properties of this structure. Based on a finite element (FE) model of the drum, the boundary element method (BEM) was used to predict the sound radiated from the vibrating drum due to an excitation force applied to one of the cutting bits. Simulations were used to examine the following with respect to the radiated sound power: (1) the ramifications of adding the welds to the model rather than assuming direct attachment between the metal components; (2) the effect of weld stiffness; (3) the relative contributions of the vanes and the cylindrical part of the drum; and (4) the sensitivity to the direction of the applied force. Parametric studies have shown that including the weld in the finite element model has a significant effect on the predicted sound power level, while varying the weld Young’s modulus by 20% does not radically change the sound radiation. Panel contribution analysis indicates that the vanes contribute much more to the total sound power level, as compared to the cylindrical part of the drum. Consequently, it is expected that damping treatments would be most effective at controlling noise radiation if applied to the vanes rather than to the cylindrical portion. Finally, case study results show that the sound power levels are most sensitive to the tangential and bending forces above 500 Hz. For frequencies below 500 Hz, the sound power level is most sensitive to axial and bending forces.
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Reports on the topic "Panel/pillar mining method"

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Cytryn, Eddie, Mark R. Liles, and Omer Frenkel. Mining multidrug-resistant desert soil bacteria for biocontrol activity and biologically-active compounds. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7598174.bard.

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Control of agro-associated pathogens is becoming increasingly difficult due to increased resistance and mounting restrictions on chemical pesticides and antibiotics. Likewise, in veterinary and human environments, there is increasing resistance of pathogens to currently available antibiotics requiring discovery of novel antibiotic compounds. These drawbacks necessitate discovery and application of microorganisms that can be used as biocontrol agents (BCAs) and the isolation of novel biologically-active compounds. This highly-synergistic one year project implemented an innovative pipeline aimed at detecting BCAs and associated biologically-active compounds, which included: (A) isolation of multidrug-resistant desert soil bacteria and root-associated bacteria from medicinal plants; (B) invitro screening of bacterial isolates against known plant, animal and human pathogens; (C) nextgeneration sequencing of isolates that displayed antagonistic activity against at least one of the model pathogens and (D) in-planta screening of promising BCAs in a model bean-Sclerotiumrolfsii system. The BCA genome data were examined for presence of: i) secondary metabolite encoding genes potentially linked to the anti-pathogenic activity of the isolates; and ii) rhizosphere competence-associated genes, associated with the capacity of microorganisms to successfully inhabit plant roots, and a prerequisite for the success of a soil amended BCA. Altogether, 56 phylogenetically-diverse isolates with bioactivity against bacterial, oomycete and fungal plant pathogens were identified. These strains were sent to Auburn University where bioassays against a panel of animal and human pathogens (including multi-drug resistant pathogenic strains such as A. baumannii 3806) were conducted. Nineteen isolates that showed substantial antagonistic activity against at least one of the screened pathogens were sequenced, assembled and subjected to bioinformatics analyses aimed at identifying secondary metabolite-encoding and rhizosphere competence-associated genes. The genome size of the bacteria ranged from 3.77 to 9.85 Mbp. All of the genomes were characterized by a plethora of secondary metabolite encoding genes including non-ribosomal peptide synthase, polyketidesynthases, lantipeptides, bacteriocins, terpenes and siderophores. While some of these genes were highly similar to documented genes, many were unique and therefore may encode for novel antagonistic compounds. Comparative genomic analysis of root-associated isolates with similar strains not isolated from root environments revealed genes encoding for several rhizospherecompetence- associated traits including urea utilization, chitin degradation, plant cell polymerdegradation, biofilm formation, mechanisms for iron, phosphorus and sulfur acquisition and antibiotic resistance. Our labs are currently writing a continuation of this feasibility study that proposes a unique pipeline for the detection of BCAs and biopesticides that can be used against phytopathogens. It will combine i) metabolomic screening of strains from our collection that contain unique secondary metabolite-encoding genes, in order to isolate novel antimicrobial compounds; ii) model plant-based experiments to assess the antagonistic capacities of selected BCAs toward selected phytopathogens; and iii) an innovative next-generation-sequencing based method to monitor the relative abundance and distribution of selected BCAs in field experiments in order to assess their persistence in natural agro-environments. We believe that this integrated approach will enable development of novel strains and compounds that can be used in large-scale operations.
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