瓦斯抽放条件下采空区气体运移规律的数值模拟研究

Numerical Simulation Study on Migration Rule of Gas in Goaf in Condition of Drainage

为了掌握采空区气体的运移情况,指导采空区瓦斯的抽采工作,针对山西晋煤集团凤凰山煤矿综采工作面上隅角瓦斯超限的实际情况,在煤层顶板覆岩内布置高位钻孔直接对上邻近层卸压瓦斯进行抽采和拦截。通过建立采空区瓦斯流动模型,并对模型中各边界条件和参数进行设置,运用FLUENT软件对综采工作面顶板抽放条件下采空区气体分布及运移规律进行数值模拟,得出采空区氧气、瓦斯气体运移规律,为防治采空区遗煤自燃和瓦斯防治提供科学依据。

In order to grasp the goaf gas migration and guide drainage work of the goaf gas,according to the actual situation in gas mine fully mechanized coal Shanxi coal group in upper corner,use the gas drainage and interception in upper neighbouring coal seam by arranging high level borehole in the coal bed roof,according to the actual situation of gas concentration exceeding limits in upper corner in fully mechanized working face of Shanxi Jinmei. Through the establishment flow model of goaf gas,setting up the boundary conditions and the parameters of the model are set up,the FLUENT software is applied to simulate the distribution and migration of goaf gas in condition of roof boreholes,and laws of oxygen and gas migration are obtained. It' s provided a scientific basis for the prevention and control of spontaneous combustion in goaf.