论文部分内容阅读
为解决回风巷和上隅角瓦斯超限的问题,对高抽巷与回风巷的内错距离进行了研究。根据采场气体的流动特征,基于Navier-Stokes、Brinkman、平移-扩散方程和Fick扩散定理建立了采场瓦斯流动耦合模型,采用多物理场耦合分析软件COMSOL Multiphysics模拟无高抽巷时和高抽巷与回风巷内错距离不同时,采场瓦斯浓度及流场分布特征,并结合具体的工程实例进行了验证。结果表明:不同内错距离的高抽巷对采场瓦斯治理效果有明显的影响;采空区及工作面上部瓦斯浓度大于下部,上隅角附近平均瓦斯浓度与内错距离呈“V”型关系,当内错距离约30 m时,上隅角和采空区上部瓦斯浓度最小,瓦斯治理效果最好。数值模拟结果与现场工程应用结果基本一致,证明了模型的合理性。
In order to solve the problem of gas overrun in the return airway and the upper corner, the research on the internal distance of the high and low return lanes was carried out. Based on the flow characteristics of stope gas, a gas-liquid coupling model of stope was established based on Navier-Stokes, Brinkman, translation-diffusion equation and Fick diffusion theorem. COMSOL Multiphysics software was used to simulate the gas- When the distance between lane and air return lane is different, the gas concentration and the distribution of flow field in the stope are verified by the concrete engineering examples. The results show that the high gas drainage tunnel with different internal distance has a significant effect on gas control effect in stope. The gas concentration in the goaf and the upper part of the working face is higher than that in the lower part. The average gas concentration and the internal fault distance near the upper corner are "V When the internal distance is about 30 m, the gas concentration in the upper corner and the upper part of the goaf is the lowest, and the gas treatment effect is the best. The results of numerical simulation and field engineering application are basically the same, which proves the rationality of the model.