利用相似原理,结合多孔介质渗流达西定律,导出模拟矿井综放工作面采空区瓦斯运移规律的相似准则数。以樟村矿2306工作面采空区为原型,建立综放工作面采空区相似模型,对不同风速条件下U、U+L及U+I型通风工作面采空区的气流流动、瓦斯运移及上隅角瓦斯浓度变化进行了实验研究。研究结果表明：通风方式决定了采空区内气流流动及瓦斯运移的空间变化规律；风速决定了采空区内气流流动及瓦斯运移的波动程度和影响范围；上隅角瓦斯浓度变化受工作面通风方式及风速影响,U+I型通风方式最有利于降低上隅角瓦斯浓度,工作面风速过低易出现瓦斯积聚,风速过高则瓦斯浓度波动明显,风速在1．5~2．5 m/s时上隅角瓦斯浓度控制效果较好。%In this paper the similar criterion numbers for simulating the gas migration law in the gob area of the fully mechanized caving face were derived by using the similarity criterion and the Darcy’s Law of porous media seepage. By taking the gob area of 2306 working face in Zhangcun Coal Mine as the background, a similar model for the gob area in the fully mechanized caving face was established, and with this model, the experimental study was carried out on the laws of air flow and gas migration in the gob area and the change of the gas concentration at the upper corner angle of the working face with U, U+L or U+I ventilation pattern at different air speed. Results showed that the ventilation patterns would determine the space variation law of the air flow and gas migration in the gob area;the air speed would determine their fluctuation degree and influence scope;the change of gas concentration at the upper corner angle of the working face was subject to the influence of the ventilation pattern and air speed, U+I ventilation pattern was most conducive to lower the gas concentration at the upper corner angle, the lower air speed in the working face would cause gas accumulation, the higher gas concentration fluctuated significantly, and when the air speed was in the range of 1. 5-2. 5 m/s, the gas concentration at the upper corner angle can be under better control.
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