关键层运动诱发矿震的SOS微震监测分析
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摘要
为有效预防深部矿井综放工作面矿震事故的发生,采用SOS微震监测系统并结合数值模拟的手段对东滩煤矿1305工作面关键层运动诱发矿震活动进行研究。结果表明,可以依据微震事件的空间分布对关键层进行划分;开采1305工作面3#煤层引起关键层砂岩的破裂,其破裂过程诱导震源点先是在老顶积聚,后逐渐向上方岩层发展,等到开采后又再次降低到老顶附近;砂岩层对下部岩体的突然加载,将为冲击地压的发生创造必要的应力条件;冲击地压显现地点不一定就是矿震震源发生地点;矿震震源点集中分布在关键层垂直应力增高区附近。
In order to effectively prevent the mine quake accidents in the fully mechanized caving face in deep mine,the SOS microseism monitoring and measuring system with numerical simulation method have been applied in the 1305 coal face in Dongtan coal mine in order to study the mine quake activities caused by key stratum movements.The results shows: key stratum can be classified according to the spatial distribution of the microseism events;the crack of the key sandstone layer is caused by the mining of No.3 seam of 1305 face,and the crack process leads the focal points accumulate in the old roof firstly,gradually develop to the upper rock layer,and after mining drop again to near the roof;the sudden load of sandstone layer to the lower rocks will create the necessary stress condition for the occurrence of pressure bump;the sites of pressure bump behaviors may not always the sites of the focus of mine quake;the sites of the mine quake focal points mainly concentrate near the increasing vertical stress zone in the key stratum.
In order to effectively prevent the mine quake accidents in the fully mechanized caving face in deep mine,the SOS microseism monitoring and measuring system with numerical simulation method have been applied in the 1305 coal face in Dongtan coal mine in order to study the mine quake activities caused by key stratum movements.The results shows: key stratum can be classified according to the spatial distribution of the microseism events;the crack of the key sandstone layer is caused by the mining of No.3 seam of 1305 face,and the crack process leads the focal points accumulate in the old roof firstly,gradually develop to the upper rock layer,and after mining drop again to near the roof;the sudden load of sandstone layer to the lower rocks will create the necessary stress condition for the occurrence of pressure bump;the sites of pressure bump behaviors may not always the sites of the focus of mine quake;the sites of the mine quake focal points mainly concentrate near the increasing vertical stress zone in the key stratum.
引文
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