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为了揭示“U+I”型通风形式下综放工作面采空区遗煤及支架上方煤壁瓦斯放散与运移规律,以王坡煤矿3205综放工作面为现场背景,建立了采空区遗煤瓦斯放散与运移稳态计算模型、采空区支架上方煤壁瓦斯放散与运移非稳态计算模型。定量分析了工作面推进速度、采空区遗煤厚度和工作面配风量3个因素对由采空区遗煤瓦斯放散形成的瓦斯浓度场分布的影响,定量分析了移架放顶煤方向对由采空区支架上方煤壁瓦斯放散形成的采场巷道及采空区瓦斯浓度场分布的影响,研究结果对现场工作面瓦斯超限预测具有重要的指导意义。
In order to reveal the law of gas release and migration from coal left over from the goaf in the fully mechanized caving mining face with “U + I” type ventilation and the 3205 fully mechanized top coal caving face in Wangpo coal mine as the on-site background, Methane Emission and Transport Steady State Calculation Model of Coal Washery in Open Area, Unsteady Calculation Model of Gas Dissipation and Transportation of Coal Wall Above Goaf. This paper quantitatively analyzed the influence of the advancing speed of working face, the thickness of coal left in the goaf and the air volume of the working face on the distribution of methane concentration field formed by gas emission from coal left in coal mined-out area, The influence of the gas concentration field distribution in the stope and the gob area formed by the gas drainage from the coal wall above the goaf support is of great significance for the prediction of gas overrun in the working face.