尾巷风压及风量变化对采空区自然发火影响的理论分析与数值模拟

基于多孔介质的渗流连续性方程、动力弥散方程以及相似理论，建立了U+I型综放工作面与尾巷负压和风量变化相关的理论数学模型，对4种尾巷风量条件下有关采空区可能自燃带范围和回风流瓦斯浓度进行了模拟分析。通过理论分析和数值模拟发现，回风巷瓦斯浓度随尾巷风量变化幅度较大，而采空区可能自燃带宽度变化曲线较为平缓，因此，是否需要通过降低尾巷负压来减小采空区可能自燃带范围，必须根据各矿具体的实际情况而定:当工作面供风量较小时，实施意义不大；当工作面风量较大时，降低尾巷负压则可能既使回风巷瓦斯不超限，又使采空区浮煤自然发火危险性显著降低。

Theoretical analysis and numerical simulation of influence of the change of negative pressure and air volume of inner interlocked tail road on coal spontaneous combustion

Based on continuity equation of air leakage,seepage flow diffusion consumption equation and similarity theory,a theory and numerical model about adjusting the negative pressure and air volume of inner interlocked tail road in U+I Ventilation was established,range of spontaneous combustion and gas density in return airflow roadway were simulated and analyzed with the change of four different air volume of inner interlocked tail road.Through the theoretical analysis and numerical simulation,finds that the range ability of gas density in return airflow roadway is comparatively large by adjusting the air volume of inner interlocked tail road,but the range of spontaneous combustion is not obvious changed.A conclusion is arrived that is or isn’t need to adjust the negative pressure or air volume of inner interlocked tail road to reduce the range of spontaneous combustion is defined by the different real conditions of each coal mines: when the air volume of the air intake crossheading is small,it’s not significant;on the contrary,could not only keep the gas density in return airflow roadway not transfinite,but also reduce the fatalness observably of coal spontaneous combustion in goaf.