沿空工作面终采线外错诱冲机理及防治技术研究

Study on mechanism and prevention technology of external dislocation induced rock burst in terminal line of working face along goaf

为掌握终采线外错开采时沿空巷道围岩应力的分布规律和冲击危险,基于崔木煤矿22307工作面工程背景,通过数值模拟分析了终采线内错、外错和平齐3种情况下的应力变化特征,提出采空区顶板联动是造成沿空巷道冲击地压的主要原因,并对顶板联动条件进行了研究。研究结果表明:工作面终采线外错后与侧向采空区发生的顶板联动会带来更高的冲击危险,而顶板联动同时受厚层坚硬顶板、区段煤柱和双工作面开采宽度的影响。通过对终采线外错区域采取顶板预裂爆破措施后,微震事件能量和频次得到了明显降低,保障了末采期的安全生产。

In order to master the stress distribution law and impact risk of goaf roadway surrounding rock during staggered mining outside the terminal line, based on the engineering background of 22307 working face in Cuimu Coal Mine, the stress variation characteristics of the terminal line under three conditions of internal dislocation, external dislocation and flush were analyzed by numerical simulation. It was proposed that the roof linkage in goaf was the main cause of rock burst in goaf roadway, and the roof linkage conditions were studied. The results show that the roof linkage between the terminal line after external dislocation and the lateral goaf will bring higher impact risk. The roof linkage is affected by thick hard roof, district sublevel coal pillar and mining width of double working face at the same time. By taking roof precracking measures in the staggered area outside the terminal line, the energy and frequency of micro seismic events are significantly reduced, and the safety production during the final mining period is guaranteed.