导水裂隙带发育高度的微震监测研究

摘要

基于井-地联合微震监测工作面导水裂隙带发育高度的监测成果,分析了微震事件的空间分布特征和在垂直方向的数量特征,并对微震事件的数量和空间分布特征与导水裂隙带发育高度的关系进行了研究;采用FLAC3D数值模拟技术,对比研究了导水裂隙带发育高度.研究结果表明:井-地联合微震监测具有较高的定位精度;微震事件的平面位置主要集中在采空区和回采巷道附近,垂直方向上主要集中在煤层顶板以上110m范围内,微震事件数量在顶板以上110m后急剧减少;数值模拟结果与微震监测结果基本吻合;研究成果为导水裂隙带发育高度的监测提供了新的方法.%Based on microseismic monitoring results of the working face water flowing fractured zone development, the authors analyzed the spatial distribution characteristic of microseismic events and the quantitative characteristics in vertical direction.The relationship between the spatial distribution characteristics and the number of seismic events and height of water flowing fracture zone has been analyzed.A numerical simulation was performed to study height of water flowing fracture zone with FLAC3D by contrast.The research results have shown that microseismic monitoring has been proved to be of high positioning accuracy.The plane position of microseismic events mainly concentrated in the goaf and near the extraction opening, vertical position of microseismic events is mainly concentrated in the 110m above the coal roof, above of which, the number of microseismic events drastically reduced;the numerical simulation results agreed with the results of microseismic monitoring;the analysis result provides a new method for microseismic monitoring of height of water flowing fracture zone.