交叉断层型综放采场见方阶段应力分布及微震活动规律

Stress Distribution and Microseismic Activity Regular of Cross Fault Fully Mechanized Face at Square Stage

为揭示综放采场在两条断层交汇影响下,其分别回采至小面见方、大面见方和等效见方阶段的应力分布及微震活动性规律,采用数值模拟的方法,依据煤矿的实际地质条件及工作面的布置和回采情况构建了FLAC^(3D)数值模型,研究了见方阶段工作面附近的围岩应力分布规律。并选取工作面回采至见方结束期间的微震数据,分析了微震和覆岩的空间演化规律。通过研究得出断层是工作面回采期间的主要能量释放来源,表明该区域煤岩体在回采期间形成了弹性核,积聚了变形能。并据此制定了具有针对性的卸压措施,为现场优化及具有相同特殊地质条件的工作面提供了参考和依据。

In order to reveal the stress distribution and microseismic activity of fully mechanized caving stope under the influence of the intersection of two faults at the stage of small face square,large face square and equivalent face square,adopt the method of numerical simulation and builds the FLAC^(3D) numerical model according to the actual geological conditions,working face layout and mining situation of coal mine.The stress distribution law of surrounding rock near the working face in square stage is studied.The microseismic data from the working face mining to the end of the square are selected to analyze the spatial evolution law of microseismic and overhanging rock.It is concluded that fault is the main source of energy release during mining,which indicates that elastic core is formed during mining and deformation energy is accumulated in coal and rock in this area.According to this,the pressure relief measures are formulated to provide reference and basis for field optimization and working face with the same special geological conditions.