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针对目前冲击危险性评价方法的不足,提出了II类开采技术因素,并揭示了该类因素诱发煤岩震动异常并激发灾害发生的内在规律。结果表明,工作面推进度与高能震动事件频率成正比,推进度变化梯度与高能震动事件能量大小成正比,大的变化梯度将增加冲击地压突发的风险;煤层卸压爆破针对巷道两帮冲击启动区,爆破后7~18 h内是解危措施发挥作用的主要时段;巷帮扩修使得围岩从原有的相对稳定变为不稳定状态,扩修进尺过快显著影响煤岩震动异常;工作面停产后恢复生产时期,各能级的微震事件急剧上升,且伴随高能事件发生的危险。II类开采技术因素临时介入,打破原有平衡状态,使得煤岩宏观调整,微观破裂突然无序,激发煤岩冲击事件发生。
In view of the shortcomings of current impact risk assessment methods, the technical factors of type II mining are put forward, and the inherent laws of coal mine rock anomalies induced by these factors and the occurrence of disasters are revealed. The results show that the advancing degree of working face is proportional to the frequency of high-energy vibration events, and the variation gradient of propulsive degree is proportional to the energy of high-energy shock event. The large variation gradient will increase the risk of burst pressure bursting. Impact start zone, the blasting within 7 ~ 18 h is the main period of relief measures to play a role; lane expansion to make the surrounding rock from the original relatively stable into an unstable state, the expansion of excessive impact on coal and rock significantly affect the vibration Abnormal; After discontinued working face recovery production period, the various levels of microseismic events rose sharply, and with the danger of high-energy events. Type II mining technology intervenes temporarily, breaks the original balance state, causes macro-adjustment of coal and rock, sudden disorder of micro-rupture, and stimulates coal-rock impact event.