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根据计算流体力学基本理论,利用Fluent软件,对采空区渗透率为均匀分布、分段均匀分布、连续分布、“O”型连续分布4种不同分布情况下采空区瓦斯运移规律进行数值模拟。当渗透率均匀分布时采空区漏风较少,高浓度瓦斯分布靠近工作面;当渗透率分段均匀分布时,在采空区中有2条跳跃的瓦斯沟壑;当渗透率连续分布时,采空区漏风较多,高浓度瓦斯分布靠近采空区深部;当渗透率“O”型连续分布时,采空区漏风最多。结果表明,当渗透率不同分布情况下采空区漏风和瓦斯分布有很大差别。因此,为了得到更符合现场实际情况的瓦斯运移规律,在模拟采空区瓦斯运移规律时需要描述更能如实反映采空区煤岩冒落规律的渗透率分布。
According to the basic theory of Computational Fluid Dynamics (CFD), using Fluent software, the permeability of goaf is uniform distribution, uniform distribution, continuous distribution and “O” continuous distribution of gas distribution in goaf Numerical simulation. When the permeability is evenly distributed, there is less air leakage in the gob area and the high concentration gas distribution is close to the working face. When the permeability is evenly distributed in sections, there are 2 jumping gullys in the goaf; when the permeability is continuously distributed, There were more air leakage in the goaf, and the high concentration gas distribution was close to the deep part of the goaf. When the permeability was continuously distributed in the “O” pattern, the air leakage in the goaf was the largest. The results show that there are great differences between the air leakage and the gas distribution in the gob when the permeability is different. Therefore, in order to get the law of gas migration that is more in line with the actual situation in the field, it is necessary to describe the permeability distribution which can more accurately reflect the law of coal and rock buildup in the goaf while simulating the gas migration in the goaf.