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为了研究高瓦斯易自燃煤层采空区瓦斯与火灾复合灾害共存的情况下抽采瓦斯对采空区遗煤自然发火的影响,以彬长矿区文家坡煤矿高瓦斯易自燃的首采4101工作面为研究对象,利用ANSYS三维可视化数值模拟软件,建立了采空区漏风流场的数值模型,定量对比研究了高位钻孔抽采、邻近巷抽采和埋管抽采3种不同抽采瓦斯方法下采空区瓦斯浓度分布、采空区漏风流场以及采空区“三带”宽度范围变化的差异性。研究结果表明:采用高位钻孔抽采方法时采空区漏风流场和自燃带宽度范围在采空区深部30 m范围内的影响和变化都相对较小,能够有效的减少采空区瓦斯与火灾复合灾害的发生,从而对工作面的安全高效回采提供保障。
In order to study the influence of gas drainage on spontaneous combustion of coal left by the coal mined area under the coexistence of gas and fire disaster in the gob of spontaneous combustion coal seam with gas, Surface as the research object, the numerical model of the air leakage flow field in goaf was established by using ANSYS 3D visualization numerical simulation software. Three different gas drainage patterns The distribution of gas concentration in goaf, the leakage flow field in goaf and the difference of the width of “three zones” in the goaf. The results show that the influence and variation of air leakage flow field and auto-ignition band width in the 30 m deep in the goaf are relatively small when using the high-hole drilling method, which can effectively reduce the gas and Fire complex disaster occurred, thus safe and efficient mining face to provide protection.