华亭煤矿强矿压力学机制与防治对策

Mechanism and control measures of rockburst in Huating Coal Mine

为从机理上认识和防治华亭煤矿强矿压,应用震源机制解答方法反演强矿压岩体破裂机制,结合现场地应力测量、微震监测、现场调查、采矿活动分析和理论分析等技术途径,验证震源机制解答方法的可靠性,分析强矿压成因,制定强矿压防治策略。研究得出如下认识:震源机制解答方法反演煤矿采动岩体破裂机制的应用效果较好;华亭煤矿强矿压频发的主要原因是水平应力强度高、最大主应力方向与巷道走向大角度相交、厚层砂岩大面积悬顶、底煤厚度大且冲击倾向性强;防治此类强矿压发生的主要途径是工作面设计应避开最大主应力方向与巷道走向大角度相交、先开采底板抗冲击性能较好的下分层、顶板预裂卸掉垂向采动应力和巷道钻孔、切槽断底。

In order to understand the mechanism and prevention of rockburst in Huating mine,the rupture mechanismof rockburst was inversed,using focal mechanism solution method. Combining with in-situ stress measurement,micro-seismic monitoring,field investigation,mining analysis and theoretical analysis,the focal mechanism solution methodwas proved to be reliable,and the appropriate control strategies would be made after analyzing the causes of rockburst.It was concluded that the focal mechanism solution method was effective for mining rupture mechanism inversion. Thefrequent rockburst in Huating mine was mainly caused by great horizontal stress,the large angle of intersection betweenmaximum principal stress direction and roadway trend,the large unsupported roof of thick sandstone,and the largethickness and strong burst trend of bottom coal. There were severalways to prevent mine rockburst. During coal face de-sign,it should be avoided that the maximum principal stress direction intersected roadway trend with a big angle. Min-ing lower slice with good impact resistance,relieved vertical mining stress by roof presplitting,roadway drilling andcutting off the floor,were also the major solutions for the prevention of rockburst.