基于微震监测技术的巷道顶板稳定性分析
Roadway Roof Stability Analysis Based on Microseismic Monitoring Technology
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摘要: 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。Abstract: Taking Meiyukou Coal Mine as the engineering background, the damage situations of two main roadways and surrounding area roof failure were monitored by KJ551 microseismic monitoring system in order to protect the panel roadway safety. The stability of roadway and its temporal and spatial characteristics of microseismic energy were studied. The results show that the energy value of microseismic event has great relationship with coal rock force and concentration degree. The greater the stress and the higher the degree of concentration will lead greater degree of coal and rock deformation and failure when microseismic event occurs, and the higher energy will be released. The mining activities of the upper coal seam will lead the rupture and instability of internal roof of lower coal seam. Roadway roof stability is closely related with the upper coal seam mining. The damage degree of mining activities on different height layers of the rock is different, the fracture degree of the low rock is bigger,but the high rock is smaller.
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