Pub Date : 2024-09-01DOI: 10.1134/s106273912402011x
Leng Yuanhao, Xu Lianman, Yang Fengshuo, Li Hongbin, Ma Yufei, Li Na, Wang Hongyang, Yan Weiting, Jiang Xinjian
Abstract
The energy absorption buffer test system is developed, the impact load compression test of single free face coal sample is carried out, and the digital speckle analysis technology is used to obtain the law of the influence of the hole rate, which is the volume of the borehole divided by the volume of the coal sample, on the energy absorption rate and deformation and failure characteristics of coal sample after drilling. The change of the drill layout of two and three holes in coal samples has little effect on the energy absorption performance. The complete coal sample is easy to form vertical main cracks, and the drilled coal sample first forms stress concentration near the borehole, and a large number of cracks appear. The multihole coal samples are easy to form cracks that make the boreholes connected, which converts more impact energy into surface energy and improves the energy absorption rate of coal samples.
{"title":"Study on Energy Absorption Characteristics of Single Free Face Coal under Impact Load","authors":"Leng Yuanhao, Xu Lianman, Yang Fengshuo, Li Hongbin, Ma Yufei, Li Na, Wang Hongyang, Yan Weiting, Jiang Xinjian","doi":"10.1134/s106273912402011x","DOIUrl":"https://doi.org/10.1134/s106273912402011x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The energy absorption buffer test system is developed, the impact load compression test of single free face coal sample is carried out, and the digital speckle analysis technology is used to obtain the law of the influence of the hole rate, which is the volume of the borehole divided by the volume of the coal sample, on the energy absorption rate and deformation and failure characteristics of coal sample after drilling. The change of the drill layout of two and three holes in coal samples has little effect on the energy absorption performance. The complete coal sample is easy to form vertical main cracks, and the drilled coal sample first forms stress concentration near the borehole, and a large number of cracks appear. The multihole coal samples are easy to form cracks that make the boreholes connected, which converts more impact energy into surface energy and improves the energy absorption rate of coal samples.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A large number of cases of tunnel bottom deformation occur in nearly horizontally layered strata. This article analyzes the common characteristics of such tunnel bottom deformation through case studies, and introduces the limitations and requirements for bottom designs for China’s high-speed railway tunnels. The deformation mechanisms of the tunnel bottom were studied through the physical model experiment which revealed the interaction characteristics between the layered surrounding rock and the tunnel bottom structure. Through the numerical simulation study, the effect of different elevated arch curvatures on deformation of the tunnel bottom was investigated, and the effectiveness of elevation arch deepening in deformation control of the tunnel bottom was verified. The classified control countermeasures for deformation at the bottoms of the tunnels in nearly horizontally layered strata are provided
{"title":"High-Speed Railway Tunnel Bottom in Nearly Horizontally Soft and Hard Interlayered Strata: Deformation Mechanism and Countermeasures","authors":"Junsheng Yang, Maolong Xiang, Jian Wu, Yuwei Li, Yipeng Xie, Jinyang Fu","doi":"10.1134/s1062739124020066","DOIUrl":"https://doi.org/10.1134/s1062739124020066","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A large number of cases of tunnel bottom deformation occur in nearly horizontally layered strata. This article analyzes the common characteristics of such tunnel bottom deformation through case studies, and introduces the limitations and requirements for bottom designs for China’s high-speed railway tunnels. The deformation mechanisms of the tunnel bottom were studied through the physical model experiment which revealed the interaction characteristics between the layered surrounding rock and the tunnel bottom structure. Through the numerical simulation study, the effect of different elevated arch curvatures on deformation of the tunnel bottom was investigated, and the effectiveness of elevation arch deepening in deformation control of the tunnel bottom was verified. The classified control countermeasures for deformation at the bottoms of the tunnels in nearly horizontally layered strata are provided</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020157
Du Tong, Li Yuwei
Abstract
This article uses XGBoost algorithm to calculate rock in-situ stress. By using Pearson correlation coefficient method, it is determined that the logging parameters with the best correlation with minimum horizontal principal stress are Depth, GR, LLD, ILD, AC, VCA, with maximum horizontal principal stress are: Depth, GR, SP, CAL, DEN. In order to verify the performance of the model, linear regression, support vector machine, and random forest models are used for comparison. In order to improve the generalization performance, the (k)-fold cross-validation method is used. The results show that using XGBoost algorithm to predict rock in-situ stress with a small amount of data has a high average accuracy of 94% and good generalization performance. The linear regression model has a faster fitting speed, but the fitting accuracy is the lowest. The random forest and support vector machine models are in-between. The result confirms that the research method in this article has certain universality and can be extended to solve other rock in-situ stress prediction problems.
{"title":"In-Situ Stress Prediction Model for Tight Sandstone Based on XGBoost Algorithm","authors":"Du Tong, Li Yuwei","doi":"10.1134/s1062739124020157","DOIUrl":"https://doi.org/10.1134/s1062739124020157","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This article uses XGBoost algorithm to calculate rock in-situ stress. By using Pearson correlation coefficient method, it is determined that the logging parameters with the best correlation with minimum horizontal principal stress are Depth, GR, LLD, ILD, AC, VCA, with maximum horizontal principal stress are: Depth, GR, SP, CAL, DEN. In order to verify the performance of the model, linear regression, support vector machine, and random forest models are used for comparison. In order to improve the generalization performance, the <span>(k)</span>-fold cross-validation method is used. The results show that using XGBoost algorithm to predict rock in-situ stress with a small amount of data has a high average accuracy of 94% and good generalization performance. The linear regression model has a faster fitting speed, but the fitting accuracy is the lowest. The random forest and support vector machine models are in-between. The result confirms that the research method in this article has certain universality and can be extended to solve other rock in-situ stress prediction problems.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020054
Yankui Hao, Zhanguo Ma, Zhongxiang Lin, Wang Liu, Peng Yue, Junyu Sun, Tao Chen
Abstract
Taking working face 8006 of a coal mine in North China as the engineering background, the contact stress of each rock stratum interface is calculated based on the principle of composite beam to predict the development position of the separation layer. The distributed fiber optic sensing technology monitors the horizons where the abscission develops. The test results can accurately reflect the deformation characteristics of the overlying strata in the field, which provides an important theoretical basis and guiding role for the design of the overlying strata grouting scheme in this coal mine. The results show that when the working face is fully mined, the separation layer is mainly developed between the coarse-grained sandstone and the lower sandy mudstone at a distance of 265 m from the coal seam roof. The grouting scheme is effective, which can provide a useful reference for similar grout injection in overburden separation projects.
{"title":"Evolution Mechanism and Monitoring Technology of Overburden Deformation in Underground Mining with Grout Injection","authors":"Yankui Hao, Zhanguo Ma, Zhongxiang Lin, Wang Liu, Peng Yue, Junyu Sun, Tao Chen","doi":"10.1134/s1062739124020054","DOIUrl":"https://doi.org/10.1134/s1062739124020054","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Taking working face 8006 of a coal mine in North China as the engineering background, the contact stress of each rock stratum interface is calculated based on the principle of composite beam to predict the development position of the separation layer. The distributed fiber optic sensing technology monitors the horizons where the abscission develops. The test results can accurately reflect the deformation characteristics of the overlying strata in the field, which provides an important theoretical basis and guiding role for the design of the overlying strata grouting scheme in this coal mine. The results show that when the working face is fully mined, the separation layer is mainly developed between the coarse-grained sandstone and the lower sandy mudstone at a distance of 265 m from the coal seam roof. The grouting scheme is effective, which can provide a useful reference for similar grout injection in overburden separation projects.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1134/s1062739124020042
Yunjing Ma
Abstract
This article studied the biomechanical properties of salix root sampled from arid and semi-arid regions of China. The damage law of root in the process of stretching was analyzed by acoustic emission technique. The fractal dimension of root failure section was calculated by digital image processing technology. The results show that salix root tensile strength and ultimate elongation decreases with the diameter increasing, while ultimate tensile resistance and diameter are positively correlated. Damage variable characterized by cumulative AE energy can not only help research the rule of root damage quantitatively, but also allows determining the critical elongation when root became inactive. The optimal mining depth values are proposed, which enable reduction of ground surface deformation, elimination of root system damage, protection of planting on ground surface and, thus, decrease of possibility of bench convergence.
{"title":"Interrelation of Mechanical Properties and Root Damage of Salix with Ground Surface Subsidence","authors":"Yunjing Ma","doi":"10.1134/s1062739124020042","DOIUrl":"https://doi.org/10.1134/s1062739124020042","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This article studied the biomechanical properties of salix root sampled from arid and semi-arid regions of China. The damage law of root in the process of stretching was analyzed by acoustic emission technique. The fractal dimension of root failure section was calculated by digital image processing technology. The results show that salix root tensile strength and ultimate elongation decreases with the diameter increasing, while ultimate tensile resistance and diameter are positively correlated. Damage variable characterized by cumulative AE energy can not only help research the rule of root damage quantitatively, but also allows determining the critical elongation when root became inactive. The optimal mining depth values are proposed, which enable reduction of ground surface deformation, elimination of root system damage, protection of planting on ground surface and, thus, decrease of possibility of bench convergence.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-02DOI: 10.1134/s1062739124010010
A. N. Besedina, G. A. Gridin, G. G. Kocharyan, K. G. Morozova, D. V. Pavlov
Abstract
The authors analyze weak seismic activity at the Korobkovo iron ore deposit in the area of the Kursk Magnetic Anomaly. A sensing system in use enabled recording seismic events with a magnitude from –2.5 to –1.4 induced by a large-scale blast. Localization of hypocenteres was accurate to (sim50) m. The most of origins of the recorded events occurred in the neighborhood of a faulting zone across the zone of mining, and at the interface of bed series. The values of a seismic moment of the events are within of two orders of magnitude (10^{5}{-}10^{7}) N(,cdot,)m at an angular origin frequency of 70–600 Hz. The estimated seismic energy ranges from 0.0006 to 1 J. The reduced seismic energy values from (2cdot10^{-9}) to (2cdot10^{-7}) J/(N(,cdot,)m) and the low velocities allow categorizing the recorded events as slow earthquakes.
{"title":"Activation of Seismo-Acoustic Events after Large-Scale Blasting at an Iron Ore Body of the Kursk Magnetic Anomaly","authors":"A. N. Besedina, G. A. Gridin, G. G. Kocharyan, K. G. Morozova, D. V. Pavlov","doi":"10.1134/s1062739124010010","DOIUrl":"https://doi.org/10.1134/s1062739124010010","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The authors analyze weak seismic activity at the Korobkovo iron ore deposit in the area of the Kursk Magnetic Anomaly. A sensing system in use enabled recording seismic events with a magnitude from –2.5 to –1.4 induced by a large-scale blast. Localization of hypocenteres was accurate to <span>(sim50)</span> m. The most of origins of the recorded events occurred in the neighborhood of a faulting zone across the zone of mining, and at the interface of bed series. The values of a seismic moment of the events are within of two orders of magnitude <span>(10^{5}{-}10^{7})</span> N<span>(,cdot,)</span>m at an angular origin frequency of 70–600 Hz. The estimated seismic energy ranges from 0.0006 to 1 J. The reduced seismic energy values from <span>(2cdot10^{-9})</span> to <span>(2cdot10^{-7})</span> J/(N<span>(,cdot,)</span>m) and the low velocities allow categorizing the recorded events as slow earthquakes.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-02DOI: 10.1134/s1062739124010149
M. V. Sekretov, M. G. Rakhutin
Abstract
The article offers the force and geometry analysis of the stone block–diamond wire saw system. The friction force of the diamond wire saw in the block is determined at the parabolic adjustment of the wire sawing trajectory. The curves of the sawing force and horizontal coordinates of the blocks are plotted at different values of the parabola focus point. The actual sawing trajectories in monoliths and blocks are described. The load increase factor at the beginning of work is obtained. Using the procedure of the actual sawing trajectory, the strength analysis of the diamond segments of the diamond wire sawing machine is performed, and the stress diagrams in the diamond segments with a sharp and rounded edge are constructed. The maximal stresses in the diamond segment with the rounded edge are plotted as function of the rounding radius.
{"title":"Loading of Diamond Wire Saw of Stone Cutting Machine","authors":"M. V. Sekretov, M. G. Rakhutin","doi":"10.1134/s1062739124010149","DOIUrl":"https://doi.org/10.1134/s1062739124010149","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article offers the force and geometry analysis of the stone block–diamond wire saw system. The friction force of the diamond wire saw in the block is determined at the parabolic adjustment of the wire sawing trajectory. The curves of the sawing force and horizontal coordinates of the blocks are plotted at different values of the parabola focus point. The actual sawing trajectories in monoliths and blocks are described. The load increase factor at the beginning of work is obtained. Using the procedure of the actual sawing trajectory, the strength analysis of the diamond segments of the diamond wire sawing machine is performed, and the stress diagrams in the diamond segments with a sharp and rounded edge are constructed. The maximal stresses in the diamond segment with the rounded edge are plotted as function of the rounding radius.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-02DOI: 10.1134/s1062739124010034
T. V. Shilova, I. M. Serdyuk, S. V. Serdyukov, O. A. Ivanova, A. S. Serdyukov
Abstract
The article describes the laboratory testing of permeability and structure of loose rock hardened with two-component highly elastic polyurethane resin at different methods of impregnation and at different consumptions of the polymer. Two methods of impregnation are tested: with a single solution as a mixture of two resin components and with a double solution of separate components mixed inside the test rock. It is shown that the decrease in the volume of resin from 20–40 to 5–10 vol% results in abundance of inter-grain voids and through permeable pore channels, and in an increase in the rock permeability by two–three orders of magnitude. The single-solution impregnation with the ready mixture ensures lower permeability of the test samples.
{"title":"Change in Permeability of Loose Rocks in Partial Impregnation with High-Elastic Polymer","authors":"T. V. Shilova, I. M. Serdyuk, S. V. Serdyukov, O. A. Ivanova, A. S. Serdyukov","doi":"10.1134/s1062739124010034","DOIUrl":"https://doi.org/10.1134/s1062739124010034","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article describes the laboratory testing of permeability and structure of loose rock hardened with two-component highly elastic polyurethane resin at different methods of impregnation and at different consumptions of the polymer. Two methods of impregnation are tested: with a single solution as a mixture of two resin components and with a double solution of separate components mixed inside the test rock. It is shown that the decrease in the volume of resin from 20–40 to 5–10 vol% results in abundance of inter-grain voids and through permeable pore channels, and in an increase in the rock permeability by two–three orders of magnitude. The single-solution impregnation with the ready mixture ensures lower permeability of the test samples.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-02DOI: 10.1134/s1062739124010198
L. A. Elantseva, S. V. Fomenko
Abstract
Potentiality of drain water injection in deep geological structures is investigated as a case-study of drainage system at Yakovlevsky Mine. The problem ensues from the presence of a very high zone of conductive fractures and from the very intense hydraulic connection between the water-bearing bottom coal layer and crystal ore layer due to the increased size of the mined-out space as the mine reaches the production capacity of 5 Mt, which can lead to water inrushes to underground stopes. The authors perform the predictive modeling of the joint operation of the drainage system and drain water injection to the bottom-layer water-bearing coal stratum with a view to improving safety of mining.
{"title":"Justification of Potentiality of Mine Drain Water Injection in Deep Geological Structures: A Case-Study of Yakovlevsky Mine","authors":"L. A. Elantseva, S. V. Fomenko","doi":"10.1134/s1062739124010198","DOIUrl":"https://doi.org/10.1134/s1062739124010198","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Potentiality of drain water injection in deep geological structures is investigated as a case-study of drainage system at Yakovlevsky Mine. The problem ensues from the presence of a very high zone of conductive fractures and from the very intense hydraulic connection between the water-bearing bottom coal layer and crystal ore layer due to the increased size of the mined-out space as the mine reaches the production capacity of 5 Mt, which can lead to water inrushes to underground stopes. The authors perform the predictive modeling of the joint operation of the drainage system and drain water injection to the bottom-layer water-bearing coal stratum with a view to improving safety of mining.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-02DOI: 10.1134/s1062739124010058
A. S. Kalyuzhny, I. Yu. Rozanov
Abstract
The article discusses an integrated approach to finding causes of pit wall failure in Zhelezny Mine of Kovdor GOK. Radar monitoring with IBIS provided data for the slope instability prediction. The stability calculation is performed and analyzed for the failed site of the pit wall. It is shown at the adopted strength properties, failure of the upper bench is only possible as its stability factor is less than 1.50. The causes of instability could be the decreased strength of the pit wall as a result of weathering or watering, and failure could occur along a fracture. An industrial building in the close vicinity of the failure site had no influence on the slope stability. The recommendations on finding certain causes of instability are given.
{"title":"Causes of Pit Wall Failure in Zhelezny Mine by Radar Monitoring and Stability Calculations","authors":"A. S. Kalyuzhny, I. Yu. Rozanov","doi":"10.1134/s1062739124010058","DOIUrl":"https://doi.org/10.1134/s1062739124010058","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article discusses an integrated approach to finding causes of pit wall failure in Zhelezny Mine of Kovdor GOK. Radar monitoring with IBIS provided data for the slope instability prediction. The stability calculation is performed and analyzed for the failed site of the pit wall. It is shown at the adopted strength properties, failure of the upper bench is only possible as its stability factor is less than 1.50. The causes of instability could be the decreased strength of the pit wall as a result of weathering or watering, and failure could occur along a fracture. An industrial building in the close vicinity of the failure site had no influence on the slope stability. The recommendations on finding certain causes of instability are given.</p>","PeriodicalId":16358,"journal":{"name":"Journal of Mining Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141513119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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