唐山矿深部孤岛工作面冲击地压预控技术研究

Study on the pre-control of rock burst in the isolated island face of Tangshan mine

冲击地压是严重危害矿井安全生产的动力灾害之一。孤岛工作面及其巷道附近应力集中程度高、顶板运动剧烈,易发生冲击地压。本文针对唐山矿孤岛工作面的特性,首先运用综合指数法确定Y484工作面的危险等级,将该工作面划分为7个弱冲击强度、2个中等冲击强度和3个强冲击强度区域;而后采用钻孔应力计和十字布点法确定了区域内的支撑压力峰值位置和影响范围,并根据不同的冲击地压危险等级分别采用钻孔卸压和爆破卸压技术对冲击地压进行预控。应用结果表明,该综合防治技术对Y484工作面的防控安全有效。

Rockburst is one of the dynamic disasters that seriously threatened the safety of mine production.The stress concentration in the isolated working face and its roadway is high,and the characteristics of the violent roof movement make it more easy to occur rock burst.In view of the characteristics of isolated working face in Tangshan Coal Mine,firstly,the comprehensive index method was used to determine the dangerous grade of working face Y484,and the working face was divided into seven weak impact strength,two medium impact strength and three strong impact strength areas.Later,borehole stress gauge and cross-point method were adopted to determine the peak position and influence range of support pressure in the area.According to different dangerous grades of rock burst,the technology of borehole pressure relief and blasting pressure relief were used to pre-control rock burst.The application study shows that the comprehensive prevention and control technology is safe and effective for the prevention and control of working face Y484.