关键层运动诱发矿震的微震探测初步研究

The primary study on microseismic locating and monitoring technology of shock bump caused by key stratum movement

采用微地震定位监测技术对华丰煤矿关键层运动诱发矿震进行了研究.根据岩体在三维空间的破裂成像,得出:可以依据微震破裂事件的空间分布对关键层进行划分;开采6,4层煤均引起了主关键层砾岩的破裂,砾岩破裂位置的发展顺序在倾向上逐渐向实体煤扩展,在高度上先从下部开始;冲击地压显现地点不一定是矿震震源发生地点;统计观测的结果表明:部分砾岩断裂导致了矿震发生,大约50%的矿震是由于关键层的破裂引起的,只有个别矿震导致了冲击地压显现,说明了矿震与冲击地压的区别.展示了冲击地压产生原因的多样性及复杂性,提出了应根据不同的产生原因进行冲击地压防治的思路.

Studied the shock bump caused by the key stratum movement in Huafeng Colliery using the microseism locating and monitoring technology. Based on the 3D rock cracking imaging, obtained the conclusions： key stratum can be classified according to the special attribution of the microseismic cracking events. The cracking of the primary key stratum caused by the exploitation of No. 4 and No. 6 coal seams. The cracking sites of conglomerate expand to the entity coal in incline direction and the cracking occurred from the below part in vertical direction. The sites of pressure bump behavior were not always the sites of the shock bump focus. Statistics results of observation indicated that shock bumps were caused by part of conglomerate rupture, and about 50 percent of shock bump occurred by the reason of the cracking of key stratums. Few of them induced to pressure bump behavior. So it was revealed that there have differences between shock bump and pressure bump. The results show the reasons variety and complicity of pressure bump behavior and put forwards the method that the prevent and cure ways of the pressure bump alter to different reasons.