Failure characteristics and fracture mechanism of overburden rock induced by mining:A case study in China
Jiawei Li1
Meng Zhang2
Changxiang Wang2
Changlong Liao2
Baoliang Zhang3
1.Department of Energy and Power Engineering,College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing),Beijing,China;Department of Energy and Power Engineering,Tsinghua University,Beijing,China2.College of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232000,China3.School of Architecture and Civil Engineering,Liaocheng University,Liaocheng 252000,China
摘要：This study employs similar simulation testing and discrete element simulation coupling to analyze the failure and deformation processes of a model coal seam's roof.The caving area of the overburden rock is divided into three zones:the delamination fracture zone,broken fracture zone,and compaction zone.The caving and fracture zones'heights are approximately 110 m above the coal seam,with a maximum subsidence of 11 m.The delamination fracture zone's porosity range is between 0.2 and 0.3,while the remainder of the roof predominantly exhibits a porosity of less than 0.1.In addition,the numerical model's stress analysis revealed that the overburden rock's displacement zone forms an'arch-beam'structure starting from 160 m,with the maximum and minimum stress values decreasing as the distance of advancement increases.In the stress beam interval of the overburden rock,the maximum value changes periodically as the advancement distance increases.Based on a comparative analysis between observable data from on-site work and numerical simulation results,the stress data from the numerical simulation are essentially consistent with the actual results detected on-site,indicating the validity of the numerical simulation results.
机标关键词：characteristicsmechanismstudycaserockchinafailurefracture
论文发表日期：2024-06-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：15( 241-255 )
英文信息