红庆河煤矿3^(-1)402大采高工作面微震活动时空演化特征研究

Spatio-temporal evolution characteristics of microseismicity at 3^(-1)402 large mining height working face of Hongqinghe Coal Mine

为解决红庆河煤矿采区3^(-1)煤层采高较大、来压剧烈,易出现片帮、空顶、冒顶等问题,采用微震联合监测系统对红庆河煤矿3^(-1)402工作面进行微震信号监测,分析了工作面过切眼、斜联巷、停采线等特殊区域期间以及回采速度对微震活动时空分布的影响。结果表明,微震事件在工作面超前400m范围内分布比较集中,频次与推进度成正相关;微震活动主要受工作面超前支承应力、采空区侧向支承应力及巷道煤柱两侧集中应力,3种应力叠加影响。研究结果可为类似矿井冲击地压的有效防治提供科学依据。

In order to solve the problem that the mining height of the 3^(-1)coal seam in the mining area of Hongqinghe Coal Mine is relatively high with severe weighting,and wall spalling,empty roof and roof fall are easy to occur,the microseismic joint monitoring system is used to monitor the microseismic signal of the 3^(-1)402 working face of Hongqinghe Coal Mine.The influence of the over cut,inclined cross roadway and stopping line of the working face and the mining speed on the spatio-temporal distribution of microseismic activities is analyzed.The results show that the distribution of microseismic events is relatively concentrated within 400 m ahead of the working face,and the frequency is positively correlated with the advance degree;The microseismic activity is mainly affected by the superposition of the leading bearing stress of the working face,the lateral bearing stress of the goaf and the concentrated stress on both sides of the roadway pillar.The study provides scientific basis for the effective prevention and control of rock burst in similar mines.