U+L型通风采空区瓦斯运移数值模拟与实验研究

Numerical simulation and experiment research on gas migration in goaf under U+L type ventilation

为获取U+L型通风综采采空区瓦斯运移规律,依据渗流理论和质量守恒定律,建立了综采采空区瓦斯运移方程;以淮南矿区1111综采工作面为研究对象,采用FLUENT软件对采空区瓦斯运移规律进行了三维数值模拟研究,并采用相似材料实验方法对数值模拟的可靠性进行了验证;从数值模拟和实验结果对比分析来看:采用FLUENT数值模拟方法研究采空区瓦斯运移规律是合理、可行的,与相似实验结果相一致;U+L型通风方式下,采空区在走向、倾向和竖直方向上瓦斯分布具有一定规律性;与U型通风方式相比较,U+L型通风通过增加尾巷抽排瓦斯的方式,可明显降低工作面和上隅角瓦斯浓度,以确保矿井安全生产。

In order to gain gas migration law of goaf in fully mechanized coal mining working face under U ＋ L venti- lation, a goaf gas migration equation was established based on seepage theory and the law of mass conservation. Taking No. 1111 working face of Huainan Mining Area as the research object and using FLUENT software, gas mi- gration rule of goal was simulated, and the numerical simulation reliability was validated by similar experiments. From numerical simulation and experiment results, it can be concluded that gas migration law of goal obtained from numerical simulation method through FLUENT is logical and feasible, and the results agree with those from experi- ments. Gas distribution in goal has some laws in the strike, incline and vertical direction for U ＋ L ventilation. Compared with U-type ventilation, gas concentration in working face and top corner can be evidently reduced by in- creasing tunnel exhaustion for U ＋ L-type ventilation, which is beneficial to safety production for mines.