Failure characteristics and fracture mechanism of overburden rock induced by mining:A case study in China

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外文摘要：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.

外文关键词：

Fracture development characteristicsSimilar simulation experimentLayer porosityDiscrete element numerical simulation

作者：

Jiawei Li、Meng Zhang、Changxiang Wang、Changlong Liao、Baoliang Zhang

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作者单位：

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,China

College of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232000,China

School of Architecture and Civil Engineering,Liaocheng University,Liaocheng 252000,China

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基金：

National Key R&D Program of ChinaNational Key R&D Program of ChinaNational Natural Science Foundation of ChinaOpen Fund of the National and Local Joint Engineering Research Center for Safe and Accurate Coal Mining

项目编号：

2023YFC30091002023YFC300910252304198EC2021016

出版年：

2024

DOI：

10.1007/s40789-024-00693-x

国际煤炭科学技术学报(英文)

CSTPCD

ISSN：2095-8293

年,卷(期)：2024.11(3)