Monitoring and evaluation of disaster risk caused by linkage failure and instability of residual coal pillar and rock strata in multi-coal seam mining

作     者：Qing Ma Xiaoli Liu Yunliang Tan Yurui Wang Ruosong Wang Enzhi Wang Xuesheng Liu Zenghui Zhao Darui Ren Weiqiang Xie Ruipeng Qian Nan Hu 

作者机构：State Key Laboratory of Hydroscience and EngineeringTsinghua UniversityBeijing100084China College of Energy and Mining EngineeringShandong University of Science and TechnologyQingdaoShandong266590China Shandong Energy Xinwen Group Xinjulong CO.LTDShandong294718China 

出 版 物：《Geohazard Mechanics》 (岩土灾变力学（英文）)

年 卷 期：2023年第1卷第4期

页      面：297-307页

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：the financial support by the National Natural Science Foundation of China(Nos.52304093,52074168,52079068,41941019) Shandong Province Key Research and Development Program(No.2019SDZY02) Shandong Taishan Scholars Climbing Program(No.tspd20210313) State Key Laboratory of Hydroscience and Engineering foundation(No.2021-KY-04) Natural Science Foundation of Shandong Province Outstanding Youth Fund project(No.ZQ2022YQ49) the Taishan Scholars Project Special Fund(No.tsqn202211150) the Anhui Engineering Research Center of Exploitation and Utilization of Closed/Abandoned Mine Resources(No.EUCMR202205) 

主　　题：Multi-seam mining Residual coal pillar Linkage instability Rock burst Monitor and evaluation 

摘      要：Comprehensive research methods such as literature research,theoretical analysis,numerical simulations and field monitoring have been used to analyze the disasters and characteristics caused by the linkage failure and instability of the residual coal pillars-rock strata in multi-seam *** effective monitoring area and monitoring design method of linkage instability of residual coal pillar-rock strata in multi-seam mining have been *** evaluation index and the risk assessment method of disaster risk have been established and the project cases have been applied and *** results show that:①The coal pillar will not only cause disaster in singleseam mining,but also more easily cause disaster in multi-seam *** instability of coal pillars can cause not only dynamical disasters such as rock falls and mine earthquakes,but also cause surface subsidence and other disasters.②When monitoring the linkage instability of residual coal pillar-rock strata,it is not only necessary to consider the monitoring of the apply load body(key block),the transition body(residual coal pillar)and the carrier body(interlayer rock and working face),but also to strengthen the monitoring of the fracture development height(linkage body).③According to the principles of objectivity,easy access and quantification,combined with investigation,analysis,and production and geological characteristics of this mining area,the main evaluation indexes of the degree of disaster caused by linkage instability of residual coal pillar-rock strata are determined as:microseismic energy,residual coal pillar damage degree,fracture development *** the evaluation index classification table was also given.④According to the measured value of the evaluation index,the fuzzy comprehensive evaluation method was used to calculate the disaster risk degree in the studied mine belongs to class III,that is,medium risk *** corresponding pressure relief technology was adopted on site,which ach