Study on Gas Emission and Migration Law of Residual Coal in Gob and Coal Wall aboveSupport in Fully Mechanized Caving Face with U+I-shape Ventilation System
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摘要: 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。Abstract: In order to reveal the gas emission and migration laws of residual coal in the gob and coal wall above the support in the fully mechanized caving face with U+I-shape ventilation system, No.3205 fully mechanized caving face of Wangpo Coal Mine was taken as the site background, the steady computing model of gas emission and migration of residual coal in the gob and the unsteady computing model of gas emission and migration of the coal wall above the support were set up. Quantitative analysis was carried out on the influence of the face advancing speed, the thickness of the residual coal in the gob and the distributed air volume in the face on the gas-concentration field distribution formed by the gas emission of residual coal in the gob, and quantitative analysis was also carried out on the influence of the moving direction of support and top-coal caving direction on the gas-concentration field distribution in the gob and roadway formed by the gas emission of the coal wall above the support. The results have important guiding significance for gas overrun prediction in the coal face.
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