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以煤峪口矿为工程背景,为保护盘区大巷的安全,采用KJ551微震监测系统对2条大巷及周边区域顶板破坏情况进行实时监测,研究了巷道稳定性及其微震时空能量特性。研究发现:微震事件能量值与煤岩应力大小和集中程度有很大关系,应力越大,集中程度越高,微震发生时煤岩体变形破坏的程度越大,释放的能量越高;上层煤层的采掘活动会引起下层顶板内部的破裂失稳,巷道顶板稳定性与上层煤层的采掘活动密切相关;采掘活动对不同高度层位的岩层的破坏程度是不同的,低位岩层的破裂程度大,而高位岩层的破裂程度较小。
Taking the Meiyukou mine as an example, the KJ551 microseismic monitoring system was used to monitor the roof damage of two lanes and the surrounding area in real time. The stability of the roadway and the spatiotemporal energy characteristics of the microseismicity were studied. The results show that the energy value of microseismic events is closely related to the stress and concentration of coal and rock. The higher the stress and the higher the degree of concentration, the greater the extent of deformation and failure of coal and rock mass during microseismic events and the higher the energy released. The upper coal seam The excavation activities will lead to the rupture and instability in the roof of the lower floor. The roof stability of the roadway is closely related to the excavation activity of the upper coal seam. The destructive degree of the mining activities to the rock layers with different height is different, High rock fractures less.