余吾煤矿N1100工作面采动覆岩运动及显现特征分析

Analysis of mining overburden movement and developing characteristics in N1100 working face

为更加深入了解余吾煤矿开采覆岩运动和矿压显现规律,采取微震监测和统计分析的方法,以N1100工作面为研究背景,对微震事件分布及能量演化规律和覆岩运动范围进行分析,研究表明:N1100工作面侧向采空区和本工作面联动下的顶板实现了较为良好的断裂释能;动压显现的应力峰值位于工作面前方60~100 m范围内,超前动压显著影响范围为超前200~220 m,非动压影响区在工作面超前320~340 m范围以外,为工作面停采线外大巷煤柱的优化设计及其超前抗震支护提供了数据依据。

In order to have a deeper understanding of the overburden movement and the law of ore pressure in Yuwu Coal mine,the microseismic monitoring and statistical analysis method are adopted,and the N1100 working face is taken as the research background to analyze the microseismic event distribution and energy evolution law and the motion range of overburden.The research shows that:The roof of N1100 working face realizes relatively good fracture energy release under the linkage between the lateral goaf and this working face.The peak stress of dynamic pressure is located in the range of 60~100m in front of the working face,the significant influence range of dynamic pressure is 200~220m in front of the working face,and the non-dynamic pressure influence area is beyond the range of 320~340m in front of the working face,which provides the data basis for the optimization design of coal pillar outside the stoping line of the working face and its advance seismic support.