采动诱发断层活化的微震活动规律研究

Research on the Microseismic Activity of Fault Reaction Induced by Coal Mining

研究了采动诱发断层活化过程,提出了断层活化过程的4个阶段;结合现场微震监测,分析了微震平面分布、能量与频次随工作面推进度的变化规律以及断层区域微震信号波形特征。研究结果表明:断层活化过程释放能量较大,围岩弹性粘滑振荡过程是能量释放的最主要阶段,围岩塑性粘滑失效过程中产生震动的频次低、能量小,为弹性能积累阶段,微震信号呈持续时间长、频率低、振幅小、衰减慢的波形特征。研究成果为受断层影响的矿井评价断层危险性与预测断层活化导致的冲击矿压提供依据,具有一定的理论意义与实用价值。

the process of fault reaction induced by mining was studied and it proposed the four stages of fault reaction.With on-site MS monitoring,the MS plane distribution,variation of energy and frequency with the advancing degree of working face and the wave characteristics of MS signals in area with fault were analysed.The result show that the energy released in the process of fault reaction is greater and the energy released in Stage Two is the most important process while the lowest energy and small times of MS in Stage Three which accumulated energy.MS signals presented the wave characteristics of long duration,low frequency,small amplitude and slow decay.Research results provided the basis for evaluating fault risk and predicting rock burst caused by fault reaction in mines affected by faults,which has a certain theoretical significance and practical value.