深井区段煤柱冲击地压静载荷探测及综合防控技术

Static Load Detection and Comprehensive Prevention Technology of Rock Burst for Deep Shaft Section Coal Pillar

针对郓城煤矿1301工作面临空80m区段煤柱冲击地压防控难题,分析了区段煤柱冲击地压发生的主导因素,采用震波CT原位探测技术评价区段煤柱冲击危险性,制定了综合防治方案并进行现场应用。结果表明:80m区段煤柱冲击地压载荷源为高自重应力、强构造应力与采空区侧向支承压力叠加而成的静载荷;基于静载荷探测的震波CT原位评价技术揭示区段煤柱测区内冲击危险指数C=0. 5~0. 7,具有中等冲击危险;巷帮大直径钻孔强预卸压可转移高应力、改变煤层积聚弹性能的条件,巷道全断面支护加固来增强围岩的整体抗冲能力,确定合理推进度降低开采扰动,综合监测预警确定动态冲击危险区并及时卸压解危,现场应用表明防治效果明显。

In order to prevent and control the rockburst of gob-side entry with 80 m section coal pillar in 1301 working face in Yuncheng Coal Mine,the main influence factors are investigated,seismic wave CT is used to detected the static load of rockburst area for burst hazard assessment,and the prevention measures are formulated and applied.The results show that:the rockburst load source of 80 m section coal pillar is static load composed of the high gravity stress,strong tectonic stress and the lateral abutment pressure of goaf;in-situ evaluation technology of seismic CT based on static load detection shows that the burst hazard indices of the section coal pillar are C=0.5~0.7 and has moderate degree burst hazard;large-diameter borehole pre-relief technology is used to transfer concentrated stress and dissipate elastic strain energy of roadway side,full roadway section is designed to improve the anti-impact ability;reasonable advancing speed is determined to reduce mining disturbance,the comprehensive monitoring-early warning was determined the dynamic burst hazard area and pressure-relief measures.Field application shows favorable effect.