浅埋深高瓦斯工作面瓦斯抽放对采空区自燃“三带”的影响研究

Study on Influence of Gas Drainage on Spontaneous Combustion“Three Zones”of Goaf in Shallow Buried Deep and High Gas Working Face

以五虎山煤矿010908工作面为背景,采用理论分析、数值模拟和现场实测等手段对浅埋深高瓦斯工作面瓦斯抽放对采空区自燃"三带"影响进行研究。研究结果表明:当瓦斯绝对涌出量与采空区漏风量处于均衡状态时,此时瓦斯对煤自燃将出现明显的耦合影响;当采空区漏风量小于瓦斯绝对涌出量时,采空区遗煤自燃将受到阻碍;与之相反,当漏风量大于瓦斯涌出量时,采空区遗煤自燃受瓦斯涌出量的影响较小;高位钻孔与工作面距离越远,采空区内部的漏风路径也越长,采空区氧化带、窒息带所处的区域越向采空区深部扩大,但靠近工作面一侧的氧化带范围并没有出现明显变化。

Take Wuhushan Coal Mine 010908 working face as the background, theoretical analysis, numerical simulation and field measurement are used to study the influence of shallow buried depth gas working face gas drainage on goaf spontaneous combustion "three zones". Results show that when the absolute gas emission is in equilibrium with the air leakage in goaf, the coupling effect of gas on spontaneous combustion of coal will be obvious. When the air leakage in goaf is less than the absolute gas emission, the spontaneous combustion of residual coal in goaf will be hindered. On the contrary, when the air leakage is greater than the gas emission, the spontaneous combustion of residual coal in goaf is less affected by the gas emission. The higher the distance between the upper borehole and the working face is, the longer the air leakage path inside the goaf is, and the oxidation zone and asphyxiation zone in the goaf expand deeper into the goaf, but the oxidation zone on the side near the working face does not change significantly.