深井巷道过断层群期间微震规律分析

Analysis on Microseismic Law When Deep Mine Roadway Heading Passed Through Fault Group

为更有效地预防深部矿井掘进工作面过断层群期间冲击矿压事故的发生,采用微震监测系统对断层群区域煤岩体内微震活动进行了全时段监测。基于微震活动在能量释放与震动频次方面的变化特征,分析了断块活动聚集能量对冲击矿压的诱发影响,以及断层群区域人为采掘扰动影响下的微震活动变化规律。结果表明:断层群构造区域微震活动具有较高的不稳定性,随着掘进工作面逐渐临近,区域内每日震动释放总能量值起伏波动逐渐增大,最大能量值呈现快速攀升趋势;强烈微震活动发生前有一段弱震活动时期,弱震活动为强震再次发生起到蓄能作用。

In order to effectively prevent the pressure bumping accidence occurred when a deep mine roadway heading face passed through fault group,the microseism monitoring and measuring system was applied to the full time monitoring and measuring on the microseismic activities in the coal and rock mass of the fault group area.Based on the variation features of the energy releasing and vibration frequency in the microseismic activities,the paper analyzed active accumulated energy of the fault block affected to the pressure bumping occurred and analyzed the variation law of the microseismic activity influenced by the human mining and excavation in the fault group area.The results showed that the microseismic activity in the fault group tectonic area would have a high instability.With the mine roadway face steadily closed to the fault group,the daily seismic released total energy value in the fault group area would be steadily increased.The max energy peak would be a tendency to be rapidly increased.Before the strong microseismic activity occurred,there would be a weak seismic activity period and the weak seismic activity would play an energy accumulation role to have a strong seismic to be occurred.