近距离煤层群立体抽采瓦斯流动规律的模拟

Simulation of gas flow rule at three-dimensional drainage under close-distance seam group mining

对近距离煤层群采空区垮落带破碎煤岩的渗透率进行量化研究,得出其分布规律;采用Fluent软件模拟了近距离煤层瓦斯立体抽采防突过程,得出了抽采钻孔周围的瓦斯流动规律,抽采钻孔周围煤体中瓦斯压力分布,从钻孔中心向外0～8 m范围内呈增大扩散,抽采钻孔周围煤体中瓦斯流动速度场分布,从钻孔中心向外0～2 m范围内呈减小扩散,确定了相关的抽采负压、流量和抽采半径等参数。

Through studying on permeability of coal and rock at goaf collapse zone under close-distance seam group mining,the gas distribution law was received.Simulated the three-dimensional drainage under close-distance seam group mining using Fluent software,the gas flow law of around drilling holes was received.the methane pressure of drilling holes becomes larger from the center to outer circle in the distance of 0～8 m,and the methane flow velocity gets smaller in the distance of 0～2 m.The drainage negative pressure and quantity of flow and influence semi-diameter of drainage were confirmed.