FORCED THRUST MECHANISM OF FAULT MUTATION IN DEEP MINING
LI Tie1，2，WANG Jinan1，2，LIU Jun3
(1. State Key Laboratory of High-efficiency Mining and Safety of Metal Mines，Ministry of Education，University of Science and Technology Beijing，Beijing 100083，China；2. School of Civil and Environment Engineering，University of Science and Technology Beijing，Beijing 100083，China；3. Yima Coal Industry Group，Yima，Henan 472300，China)
Abstract：In Laohutai coal mine，it occurred that normal fault was activated and varied into thrust fault movement，and strong mining earthquake energy release was produced during deep mining. The mechanical mechanism was explored by using microseismic monitoring and focal mechanism solutions，combining field investigation，in-situ stress measurement and three-dimensional numerical experiments. Analysis and conclusions: coal mining resulted in activation of faults，and the action mode of mining stress led the mode of fault movement. changing the fracture mechanisms of original fault；deep normal fault was mined in hanging wall after crossing fault in footwall，and the change of the direction of normal fault motion was caused by mining induced concentrated stress，forcing thrust motion，accompanied by the releasing of strong mining earthquake energy，and barriers and asperities can be sheared，also it may initiate second main-earthquake；the details about preventing normal fault catastrophe should be dynamically determined，according to the mode of action of stress during mining；by equipping with high-precision microseismic equipment，tracing analysis on spatial distribution of rock rupture sources and failure mechanism，the tendency of mining induced fault activation and variation can be caught out ahead of time，so that precaution will be taken promptly.
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2014, Vol. 33 
