超长回采工作面微震特征的影响因素研究*

为探讨超长工作面微震特征影响因素，采用微震监测技术研究42108工作面微震事件的空间分布特征及冲刷构造、推进速度、矿压对煤岩体微震事件特征的影响机制。研究结果表明:微震事件集中发生于工作面辅运巷侧，微震事件的空间分布受临近采空区、上覆煤层煤柱影响较大；微震事件能量和空间分布特征与推进速度相关性较差，当推进速度超过5.5 m/d后，微震事件频次、总能量与推进速度呈正相关；过冲刷构造时工作面推进速度降低，微震能量、频次的稳定性较差，易造成大能量积聚，使工作面危险性增大；微震事件集中发生位置与矿压值较大区域相吻合。

Study on influencing factors of microseismic characteristics of ultra-long mining face

In order to explore the influencing factors of the microseismic characteristics of ultra-long mining face,the microseismic monitoring technology was used to study the spatial distribution characteristics of microseismic events in 42108 working face and the influencing mechanism of scouring structure,advancing speed and mining pressure on the characteristics of microseismic events in coal and rock mass.The results showed that the microseismic events mainly occurred at the side of the auxiliary transportation roadway of the working face,and the spatial distribution of microseismic events was greatly affected by the adjacent goaf and the overlying coal pillar；The correlation between the energy and spatial distribution characteristics of microseismic events and the advancing speed was poor,and when the advancing speed exceeded 5.5 m/d,the frequency and total energy of microseismic events were positively correlated with the advancing speed；When passing through the scouring structure,the advancing speed of the working face decreased,the stability of the microseismic energy and frequency was poor,which was easy to cause the accumulation of large energy and increase the risk of the working face；The concentrated location of microseismic events was consistent with the region with large mining pressure.