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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.
In order to study the engineering effect caused by coal mining and its control effect on mine shocks, taking Dongtan Coal Mine as an example, based on microseismic monitoring data, the relationship between microseism source distribution and vertical stress secondary distribution and advance support pressure distribution is analyzed. Roof caving pocket and fissure zone height.The results show that the focal point with the working face mining mainly concentrated in the fracture zone and stress rise area, and the focal point first gathered in the old roof, and then gradually developed upward, and then recovered to the top of the roof after mining The trend of micro-seismic frequency and support pressure distribution are basically the same. The microseismic energy peak has some hysteresis with respect to the support pressure peak and is expressed by the formula Y_E = M_E + Δd. The microseismic monitoring shows that the height of the overburden caving zone and fracture zone are 37.8 m And 95 m.The results are verified by numerical simulation.Finally, the Burgers model is used to illustrate the mechanism of stress, strain, strain rate and energy change during geophone.