基于微震监测的采动工程效应及矿震孕灾机理

Mining-induced engineering effects base on microseismic monitoring and disaster-pregnant mechanism of shock bump

为研究煤矿开采引发的工程效应及其对矿震的控制作用,以东滩煤矿为工程背景,基于微震监测数据,分析微震震源分布与垂直应力二次分布和超前支撑压力分布的关系,划分了顶板冒落袋和裂隙带高度.结果表明:震源点随工作面开采主要集中在裂隙带和应力升高区,且震源先是在老顶集聚,然后逐渐向上发展,开采过后又恢复到老顶附近;微震频次与支撑压力分布趋势基本一致,微震能量峰值相对支撑压力峰值具有一定的滞后性,采用公式Y_E=M_E+Δd表示;微震监测揭示的覆岩冒落带和裂隙带高度分别为37.8 m和95 m.研究结果采用了数值模拟进行验证.最后运用Burgers模型阐述了矿震孕育的应力、应变、应变速率及能量的变化机理.

For study the mining-induced engineering effects and its control action to shock bump, taking Dongtan coal mine for background,the relationship between the second distribution of vertical stress and the abundant pressure with microseismic points were analyzed and the height of caving zone and fractured zone were divided. The result show： the microseismic points were mainly concentrated in fractured zone and stress-concentrated area with the working face mining. And they were concentrated in the main roof,than developed to the upward,recovered to the main roof at last.Microseismic times were mainly consisted to abundant pressure.Microseismic energy has fixed lagging distance to abundant pressure,and using YE= ME＋ Δd to represent it. The height of caving zone and fractured zone which microseismic revealed are respectively 37. 8 m and 95 m. The research result was certified using numerical simulation. The stress,the strain,strain rate and energy mechanism were expounded using burgers model at last.