【摘要】 以济三煤矿6303工作面地质条件为背景,进行了断层冲击矿压相似模拟试验研究。利用TDS-6微震采集系统记录了试验过程微震信号,通过对微震信号频谱分析,并结合采动过程中矿压显现特征,总结提炼出断层滑移失稳微震信号的重要波形特征。试验结果表明:采动作用可诱发断层滑移失稳,如果断层围岩系统处于临界应力状态,则很小的扰动就能引起断层滑移失稳。冲击震动波传播遇到断层等不连续面时发生反射、折射,震动波部分或者完全不能穿过断层,导致在断层的另一盘监测不到震动信号。而断层滑移失稳是断层两盘发生的突然相对错动。因此,断层两盘是否监测到明显的震动信号,可以作为断层发生活化的判据。这一结论对于利用微震监测系统监测预报断层冲击矿压具有一定的借鉴意义。更多还原

【Abstract】 According to the geological conditions of Face No 6303 in Jining No 3 coalmine,the similar simulation test of fault rock burst was carried out.The microseismic(MS) signals were recorded by the TDS-6 MS test system.The character of MS signal waveform caused by fault slip destabilization was summarized and abstracted by using the frequency spectrum analysis method and combining with the character of abutment pressure in the process of test.The results indicate that the fault slip destabilization can be induced by coal mining operation,the fault slip destabilization will happen with even a small tremor if the fault and its surrounding rock system are in a critical state of stress equilibrium.The shock wave propagation will be reflected,refracted and absorbed by the discontinuity,such as fault plane.These make the shock wave can’t go through the fault and can’t be monitored in the other plate.A fault slip destabilization is a phenomenon of sudden slip between upper plate and lower plate of the fault.Based on the results,whether the clear MS signals can be monitored at two plates of fault can be a criterion of fault activity.This conclusion will generate considerable important directive significance for monitoring and forecasting the hazard of fault rock burst with MS monitoring system in coalmines.更多还原