锯齿形断层煤柱影响区冲击危险多参量分析

Multi-parameter Analysis of Shock Hazard in the Impact Area of Coal Pillar in Sawtooth Fault

工作面沿断层开采时,断层切割煤柱处极易形成高静载应力集中,导致矿压显现强度及冲击危险程度均明显增加。基于赵楼煤矿7301工作面在开采过程中的微震、应力在线及钻屑量监测结果,分析了千米埋深和断层切割等复杂地质条件下工作面过锯齿形煤柱区的多参量演化规律。研究表明,煤柱边缘及交界处应力集中程度最明显,且在工作面初次进入煤柱影响区时冲击危险程度最高。研究结果对相似地质条件工作面的安全生产特别是防治冲击地压具有一定的借鉴意义。

When the working face is mined along the fault,the high static load stress concentration is easily formed at the coal pillar cut by the fault,resulting in a significant increase in the strength of strata behavior and the degree of impact risk.Based on the microseismic,stress online and drilling cuttings moni⁃toring results of 7301 working face in Zhaolou Coal Mine during mining,the multi-parameter evolution law of working face crossing sawtooth shape coal pillar area under complex geological conditions such as kilo⁃meter burial depth and fault cutting was analyzed.The research shows that the stress concentration at the edge and boundary of the coal pillar is the most obvious,and the rock burst risk is the highest when the working face first enters the coal pillar affected zone.The research results have certain reference signifi⁃cance for the safety production of working face under similar geological conditions,especially for the pre⁃vention and control of rock burst.