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Numerical Simulation of Surface Subsidence Caused by Underground Mining Using Discrete Element Software PFC2D
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Yuan WEI1, Feifei WANG2, 3, Qingyang REN2, Songqiang XIAO2, Bin CHEN2, Honghua JIN2
Mining and Metallurgical Engineering | 2023, 43(2) : 30 - 34
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Mining and Metallurgical Engineering | 2023, 43(2): 30-34
• MINING •
Numerical Simulation of Surface Subsidence Caused by Underground Mining Using Discrete Element Software PFC2D
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Yuan WEI1, Feifei WANG2, 3, Qingyang REN2, Songqiang XIAO2, Bin CHEN2, Honghua JIN2
Affiliations
  • 1.School of Intelligent Manufacturing and Architectural Engineering, Yongzhou Vocational Technical College, Yongzhou 425100, Hunan, China
  • 2.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • 3.State Key Laboratory of Safety Technologies for Metal Mines, Changsha Institute of Mining Research Co Ltd. Changsha 410012, Hunan, China
Published: 2023-04-01 doi: 10.3969/j.issn.0253-6099.2023.02.007
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By establishing a particle flow model of geological profile with discrete element software PFC2D, the formation and development process of overlying strata cracks during the mining of ore body were studied, and the mechanism for overlying strata gradually developing into collapse and caving was also revealed. It is found that with the mining of ore bodies, fractures grow upward and increase in numbers. The goaf after mining can cause the overlying strata with tensile-shear failure, and also the new cracks will constantly occur in the strata. Tensile fractures predominantly develop in the overlying strata, but tensile fractures occur at the both ends of fracture development region. Also, more and more concentrated fractures grow upward at both ends of goaf, presenting a potential of gradual collapse and caving of goaf roof. After the third and fourth stratified ore bodies are mined out, roof collapse will take place locally and then gradually develop into roof caving of the whole goaf, finally leading to roof collapse to the surface and forming a small sinkhole on the ground surface. Then, the development progress of sinkholes can be subdivided into stable stage, slow-progress stage, rapid-progress stage and end of progress in terms of the numbers of fractures, presenting the mechanism for overlying strata developing from tensile fracture and shear fractures at both ends of goaf to overall collapse.

mining engineering  /  geological hazards  /  surface subsidence  /  numerical simulation  /  discrete element software PFC2D
Yuan WEI, Feifei WANG, Qingyang REN, Songqiang XIAO, Bin CHEN, Honghua JIN. Numerical Simulation of Surface Subsidence Caused by Underground Mining Using Discrete Element Software PFC2D[J]. Mining and Metallurgical Engineering, 2023 , 43 (2) : 30 -34 . DOI: 10.3969/j.issn.0253-6099.2023.02.007
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Article Info
doi: 10.3969/j.issn.0253-6099.2023.02.007
  • Receive Date：2022-09-23
  • Online Date：2026-03-05
  • Published：2023-04-01
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  • Received：2022-09-23
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Affiliations
    1.School of Intelligent Manufacturing and Architectural Engineering, Yongzhou Vocational Technical College, Yongzhou 425100, Hunan, China
    2.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
    3.State Key Laboratory of Safety Technologies for Metal Mines, Changsha Institute of Mining Research Co Ltd. Changsha 410012, Hunan, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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