深部开采临近断层应力场演化规律研究

Study on the evolution law of stress field when approaching fault in deep mining

针对耿村煤矿东部区段深部开采临近F16逆冲断层容易造成冲击地压问题,采用数值计算与相似材料实验相结合的研究方法,研究了随开采深度增加及临近F16断层过程中围岩应力场演化规律。研究结果表明,随着开采深度的增加及临近F16断层,增大了围岩应力集中程度,在断层上盘岩体水平推力、覆岩重力以及采空区岩层下滑力叠加作用下容易使得断层下盘岩体以某一轴线发生扭转,增大了冲击危险性。综合判断其冲击地压失稳模式为F16逆冲断层、井田境界煤柱影响下的高应力、大范围、区域性失稳。

According to the problems which F16 thrust fault can easily cause rockburst in the deep mining of the eastern mining area in Gengcun Mine, the evolution law of surrounding rock stress field was studied as the increasing of mining depth and approaching to the F16 fault by using numerical calculation and similar material experiment. Research results show that the degree of surrounding rock stress concentration becomes higher as the increasing of mining depth and approaching to the F16 fault. The fault footwall rock occurs torsion easily in an uncertain axis under the action of superposition that horizontal thrust of fault upper wall rock, the gravity of overburden rock and glide force of goaf＇ s rock mass,and rockburst hazard increased. It is determined comprehensively that rockburst occurred pattern is high stress and large range,regional instability under the influence of F16 trust fault and mining field boundary coal pillar.