石圪台煤矿过断层矿压显现规律研究

Study on rock pressure behaviors during crossing fault in Shigetai Coal Mine

以石圪台煤矿31202工作面挑顶过F306078断层为工程背景,采用数值模拟和现场实践的方法对该工作面过断层前中后的矿压显现规律进行研究。数值模拟结果显示,工作面越靠近断层,断层上半部分被动发生变形导致应力集中程度明显增大;支架循环末阻力云图显示,工作面越靠近断层,液压支架微震事件数量逐渐增多,总能量值也随之增加,但周期来压步距逐渐减小。

Taking the 31202 working face of Shigetai Coal Mine as the engineering background,the rock pressure behaviors before,during and after crossing the F306078 fault were studied by numerical simulation and on-site practice methods.The numerical simulation results show that the closer the working face is to the fault,the greater the degree of stress concentration,and the passive deformation of the upper part of the fault leads to a significant increase in stress concentration;the terminal resistance cloud map of the support cycle shows that as the working face approaches the fault,the number of micro-seismic events of the hydraulic support gradually increases,and the total energy value also increases,but the periodic weighting step gradually decreases.