煤柱下高应力区面向采空区贯通方案优化与应用

Optimization and Application for Goaf Penetration Scheme in High Stress Zone Under Coal Pillars

  • 摘要: 开采活动导致遗留煤柱内的联络巷向采空区贯通,引发应力叠加效应,形成高应力集中区,常规卸压方式难以消除大能量冲击地压事件。针对此问题,基于极限平衡理论,提出顶帮全塑性卸压方案:通过顶帮钻孔释放巷道周围极限应力,使钻孔周围形成破裂区(阻断弹性能聚集),结合顶板爆破构建球形裂纹网络。现场应用结果显示,最大微震能量从1.16×104 J降至4.38×103 J,降幅达62.3%;但剩余贯通段15~25 m处裂隙未贯通,应力集中显著。结论表明,顶帮全塑性卸压方案可有效降低冲击风险,卸压保护带宽度应不小于15 m,为类似高应力区贯通问题提供技术参考。

     

    Abstract: The mining activities have led to the penetration of interconnected roadways in the remaining coal pillars into the goaf, causing stress superposition effect and forming high stress concentration zones. Conventional pressure relief ways are difficult to eliminate large-energy rock burst events. Aiming at this problem, based on the limit equilibrium theory, a fully plastic pressure relief scheme for the roof is proposed: the ultimate stress around the roadway is released through roof drilling, forming a fracture zone around the hole (blocking the accumulation of elastic energy), and a spherical crack network is constructed by combining roof blasting. The on-site application results indicate that the maximum microseismic energy is decreased from 1.16 × 104 J to 4.38 × 103 J, with a decrease of 62.3%; But the fissures at 15-25 m of the remaining penetration section are not penetrated, with significant stress concentration. The conclusion shows that the roof full plastic pressure relief scheme can effectively reduce the impact risk, and the width of the pressure relief protection zone should not be less than 15 m, providing a technical reference for the penetration problem in similar high stress zone.

     

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