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以神华乌海能源公司平沟煤矿16#低透气性高瓦斯煤层走向超长瓦斯抽放钻孔为研究对象,建立其钻孔周围瓦斯流动方程,并用MATLAB数值分析软件对其瓦斯抽放半径进行数值分析与计算,获得“近似”的超长钻孔瓦斯抽放半径后,以此半径为参考值,在该煤层回采工作面回风巷中,选择合适观测点布置垂直于走向超长钻孔的测试钻孔,并在测试钻孔中注入SF6气体,检测超长钻孔内SF6气体浓度情况,结合二分法实施具体的优化步骤,确定出超长钻孔瓦斯抽放半径。
Based on the gas drainage equation of 16 # low gas permeability coal seam in Pinggou Mine of Shenhua Wuhai Energy Company, the gas flow equation around the borehole was established and its gas drainage radius was calculated by MATLAB numerical analysis software Numerical analysis and calculation, after obtaining the “” “approximate ” of ultra-long borehole gas drainage radius, with this radius as the reference value, select the appropriate observation point return airway in the coal mining face return face perpendicular to the long direction Borehole test drilling, SF6 gas is injected into the test borehole to detect SF6 gas concentration in the ultra-long borehole. Combined with the dichotomy, concrete optimization steps are performed to determine the gas drainage radius of the extra-long borehole.