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近距离高瓦斯煤层群开采时,受采动卸压作用工作面上部煤层瓦斯及底板下部煤层瓦斯均会对工作面造成影响导致瓦斯超限,需同时治理。针对杏花煤矿28#煤层右二工作面近距离高瓦斯煤层群开采时瓦斯涌出量大的问题,通过理论计算及数值模拟分析了顶底板煤岩破坏卸压规律为抽采工程设计提供了依据,结合工程经验采用了高位钻场、低位钻场及高抽巷相结合的立体化抽采措施控制本煤层及邻近层瓦斯,并取得了良好的应用效果。
During the mining of the close-range high-gassy coal seams, the gas in the upper coal seam and the coal seam gas in the lower part of the floor affected by the mining pressure-relief working face will affect the working face and cause the gas to exceed the limit, which needs to be treated at the same time. In order to solve the problem of large gas emission when mining near-seam high-gassy coal seams in No. 2 face of No.28 coal seam of Xinghua Coal Mine, theoretical and numerical simulations were conducted to analyze the pressure-relief rules of coal-rock failure in roof and floor, Based on the experience of the project, a high-level drilling site, a low-level drilling site and a high extraction roadway are used to control the gas in the coal seam and its adjacent layers through the three-dimensional extraction measures, and the good application effect has been achieved.