全煤厚掘进巷道瓦斯涌出数值模拟

Numerical simulation of gas emission of whole coal tunneling roadway

为揭示全煤厚掘进中煤巷瓦斯涌出规律,采用有限体积法对煤巷掘进过程中巷帮瓦斯压力及巷道瓦斯涌出速率进行数值模拟,瓦斯渗流过程控制方程采用C-N隐式时间积分方案离散化.研究结果表明:掘进煤巷巷帮采动应力集中区煤体渗透率减小对巷帮深处瓦斯向巷道方向运移具有明显的抑制作用;掘进煤巷瓦斯涌出主要集中于迎头部位,致使一个掘进循环周期内掘进煤巷瓦斯涌出总速率波动大.

Inorder to reveal laws of gas emission of the whole coal tunneling roadway,finite volume method was applied to simulate the distribution of gas pressure in the coal wall and the gas emission rate of the whole coal tunneling roadway.The C-N implicit time integral scheme is used to discrete the continuity equation of the gas seepage process.The study results show that permeability of mining stress concentrated area in the coal wall is reduced has obvious in hibitory effect ong as flowing from deep place in the coal wall to coal roadway,and that gas emission of the tunneling roadway mainly concentrated in the head-on part leads to the total gas emission of the tunneling roadway is extremely unstable in a complete driving cycle.