FAULT-PILLAR INDUCED ROCK BURST MECHANISM
OF THICK COAL SEAM IN DEEP MINING
LI Zhenlei1，2，DOU Linming1，2，CAI Wu1，2，HE Jiang1，2，WANG Guifeng1，LIU Jun3，HAN Rongjun2，3
(1. State Key Laboratory of Coal Resources and Safety Mining，China University of Mining and Technology，Xuzhou，Jiangsu
221008，China；2. School of Mines，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China；
3. Yuejin Coal Mine，Yima Mining Group，Yima，Henan 472301，China)
Abstract：There are more rock bursts happen when coal mining comes near to the fault area. To solve this severe problem，a research on the burst mechanism in fault area has done by means of theoretical analysis，laboratory experiment，numerical simulation，engineering practice，and other methods. The main research contents and conclusions are as follows：(1) The mechanical model of fault locking and unlocking is established；and by theoretical derivation，the judge formula for up unlocking and down unlocking is obtained. The formula indicates that the fault unlocking is decided by fault friction strength，fault dip angle and the ratio between horizontal stress and vertical stress. (2) The concept of fault-pillar induced rock burst is proposed，and it is classified into three kinds：rock burst induced by fault slide，rock burst induced by coal-pillar failure and rock burst induced by the interaction of fault and coal-pillar. Moreover，the burst mechanisms of the three kinds are explained. (3) The burst source distribution rule，burst influence factors and burst mechanism of the 20 times rock bursts at coalface 25110 in Yuejin coal mine are analyzed；and it is found that the majority of the rock bursts are fault-pillar induced rock burst resulting from fault slide，main roof failure and fault-pillar failure. (4) From the two aspects of weakening fault slide and coal-pillar burst，some control measures against fault-pillar induced rock burst at coalface 25110 are proposed. The engineering application presents that controlling mining speed can reduce fault slide induced rock burst and rock burst disasters can be reduced effectively by strengthening roadway supporting and releasing pressure through blasting and large diameter drilling.
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2013, Vol. 32 
