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在建立石门揭煤抽放瓦斯钻孔周围煤体瓦斯渗流方程的基础上 ,利用数值计算方法模拟分析了煤层钻孔周围瓦斯渗流规律以及影响石门揭煤钻孔瓦斯抽放率的影响因素 ,提出了在一定煤层透气性条件下原始煤层钻孔抽放瓦斯的极限抽放时间、极限抽放量和最大的安全抽放钻孔间距 ,并将数值计算结果应用于指导现场施工 ,取得了较满意的结果
On the basis of establishing gas seepage equation of coal gas around boreholes in gas leakage of Shimen coal seam, numerical simulation method was used to simulate and analyze the gas seepage law around coal seam borehole and the influencing factors of methane drainage rate in open seam boreholes Under the conditions of certain coal seam gas permeability, the limit pumping time, the ultimate pumping capacity and the maximum safe drainage borehole spacing of the raw coal seam borehole drainage gas are calculated. The numerical results are applied to guide the on-site construction and are satisfied the result of