逆断层影响下停采线调整工作面冲击地压防治研究

    Research on Coal Burst Prevention and Control for a Working Face with Stop Line Adjustment under the Influence of a Thrust Fault

    • 摘要: 针对梁宝寺煤矿某回采工作面受F05逆断层影响条件下停采线调整引起的冲击地压防治问题,采用工程地质条件分析、冲击危险主控因素判定、监测治理措施适应性分析及巷道抗冲击能力计算相结合的方法,研究停采线调整后工作面末采阶段的重点防冲区域及防治措施。结果表明:停采线调整后,工作面末采阶段冲击危险主要受F05逆断层、厚硬顶板和调采扰动共同控制,停采线外轨道顺槽为重点防冲管控区域。针对该区域动静载叠加特征,构建了微震监测、煤体应力在线监测和钻屑法相结合的综合监测体系,并提出大直径钻孔预卸压与解危卸压相配合的治理措施。基于支护系统吸能能力和围岩冲击能量平衡关系计算可知,现有支护系统可抵抗1.88级震动事件,对应可承受震动能量为2.4×105 J。研究表明,在有效卸压和监测预警条件下,现有防冲措施及支护系统能够为工作面末采阶段安全回采提供保障。

       

      Abstract: To address the coal burst prevention and control problem caused by stop line adjustment under the influence of the F05 thrust fault in a mining face of Liangbaosi Coal Mine, this study adopts a combined method of engineering geological condition analysis, identification of main controlling factors of burst risk, adaptability analysis of monitoring and control measures, and calculation of roadway impact resistance. The key burst-prone areas and prevention measures in the final mining stage after stop line adjustment are investigated. The results show that after stop line adjustment, the coal burst risk in the final mining stage is jointly controlled by the F05 thrust fault, thick and hard roof, and adjustment mining disturbance. The tailgate outside the stop line is identified as the key area for burst prevention and control. To address the superposition characteristics of dynamic and static loads in this area, an integrated monitoring system combining microseismic monitoring, online coal stress monitoring, and drilling cuttings method is established. Furthermore, a control measure combining large-diameter borehole pressure relief and targeted destressing is proposed. Based on the energy absorption capacity of the support system and the impact energy balance relationship of the surrounding rock, the existing support system can resist a seismic event of magnitude 1.88, corresponding to a tolerable vibration energy of 2.4×105 J. The study indicates that under effective pressure relief and monitoring and early warning conditions, the existing anti-burst measures and support system can ensure safe mining in the final stage of the working face.

       

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