INFLUENCE OF ACTIVATION FAULT AFTER COAL EXTRACTION ON COAL MINE KARST WATER -INRUSH
LI Qingfeng1，2，WANG Weijun1，2，PENG Wenqing1，2，PENG Gang1，2
(1. Hunan Key Laboratory of Safe Mining Techniques of Coal Mines，Hunan University of Science and Technology，Xiangtan， Hunan 411201，China；2. School of Energy and Safety Engineering，Hunan University of Science and Technology， Xiangtan，Hunan 411201，China)
Abstract：For scientifically and effectively preventing karst water bursting because of fault activation，both the mining activation rule of fault and coal mine karst water bursting effect by fault activation are studied. First of all，according to the fault formation mechanism，the stress environment of all kinds of fault forming had been analyzed，and the stress condition of coal-seam fault activating had been discussed. Then，based on the law of stress field in stope and motion of the rock mass in the course of mining process，the main reason of fault activating is because of the uneven changes between secondary vertical stress and horizontal stress. Finally，it is analyzed that water-inrush mechanism of karst is initiated by activation of fault after coal extraction. Fault activation leads to the height of water flowing fractured zone increasing，and the karst aquifer is got through because aquifuge is failure，so water inrush accident is occurred.
