中文摘要：

为了研究近距离煤层开采上覆采空区气体分布规律，确定上覆采空区自然发火危险区域，运用多孔介质渗流理论建立近距离煤层开采上覆采空区三维数学模型；对上覆及下覆采空区孔隙结构及孔隙率进行研究，利用Fluent软件对上覆采空区气体分布规律进行数值模拟．研究结果表明，上覆采空区在采煤工作面上部水平方向30m范围内氧气浓度和瓦斯浓度超限，存在自然发火危险性．

英文摘要：

In order to study the gas distribution law of the goaf of upper slice under the condition of close distance coal seam mining, and determine the spontaneous combustion dangerous area in the goaf of upper slice, a three-dimensional mathematic model of the goaf of upper slice under the condition of close distance coal seam mining is constructed, based on the theory of porous media seepage. To carry on the numerical simulation of the air gas distribution law of the goaf of upper slice, the pore structure and porosity in the upper and lower goafs are researched through the Fluent software. Research shows that the oxygen concentration and gas concentration are transfinite in the goaf of upper slice above the coal face in the upper horizontal direction within 30 m, and the risk of spontaneous combustion in the goaf of upper slice exists.