综放工作面顶煤瓦斯抽放数值模拟研究

Research of Numerical Simulation on Drainage Top Coal Gas at Working Face

结合专利技术"综放工作面架载顶煤瓦斯抽放系统",运用数值模拟软件模拟架载顶煤抽放钻孔处于不同位置时顶煤区域内瓦斯压力、顶煤瓦斯卸压范围、顶煤瓦斯浓度的分布与变化规律,分析综放工作面顶煤瓦斯运移规律和瓦斯抽放效果。模拟结果表明:抽放半径、抽放瓦斯浓度均随架载抽放管的插入深度增加而增大,顶煤瓦斯卸压范围的大小随架载抽放装置插入深度的增加而逐渐接近架载抽放钻孔的长度。

Combined with the patent-＇Gas drainage system Installed in the top coal of working face＇ and also simulates the gas pressure in the top-coal region, the range of the coal gas pressure relief, the distribution and change regulations of the top-coal gas density when the drainage device is in different location by the numeral simulation software. The simulation results show that the drainage radius and drainage gas concentration enlarge with the increasing of pipes insertion depth. The size of the coal gas pressure relief range is approaching the length of the drainage hole when the depth of the drainage device are increased.