采动影响下前伏断层活化突水的数值模拟

Numerical Simulation of Water Inrush Induced by Activation of Anterior Volt Fault under Mining

本文以某煤矿采煤工作面前伏正断层为背景,建立了采动影响下前伏断层活化突水的数值计算模型,分析了前伏断层岩体的应力、位移、塑性区和孔隙水压力随工作面回采的变化规律,揭示了前伏正断层采动活化导水机理。研究结果表明:(1)断层在距离采煤工作面70 m^10 m时间范围时,位于工作面前方的岩体会产生显著的应力集中区,最大应力集中系数为2.5;(2)工作面回采至距离断层40 m^10 m时,断层最大位移达到100 mm,出现了显著的断层活化现象;(3)当断层距离采煤工作面小于10 m时,断层与采空区产生导水通道,易发生突水事故。

In front of a certain coal mining work anterior volt normal fault as the background,numerical calculation model of water inrush was set up with anterior volt normal fault.The change law of the stress,displacement and plastic zone and pore water pressure along with the mining face was studied in rock anterior volt normal fault.The mechanism of mining activation water inrush in anterior normal fault is revealed.The results show that:(1)Working face 70 m to 10 m,from fault face appeared in front of the rock mass stress concentration significantly,the maximum stress concentration coefficient is 2.5;(2)When the working face is 40 m^10 m away from the fault,the maximum displacement of the fault reaches 100 mm,showing significant fault activation.(3)When the distance between the working face and the fault is less than 10 m,a water diversion channel between the fault and the goaf occurs,resulting in water inrush accidents.