压力指标法与瓦斯流量法测定有效抽放半径的分析

Analysis on the Method of Pressure Index and Gas Flow to Measuring Effective Drainage Radius

为准确测定郭村煤矿二1煤层顺层钻孔瓦斯有效抽放半径,分别将钻孔瓦斯压力和钻孔瓦斯流量作为考察指标进行了测定研究。结果表明:瓦斯流量法较压力指标法更能准确地测定有效抽放半径;同时,得出结论:郭村煤矿二1煤层抽放14 d时的有效抽放半径为1 m。

To accurately measure the effective drainage radius of the borehole drilled along seam in Ⅱ coal seam of Guocun Coal Mine,the authors make empirical research on it by means of gas pressure and gas flow of the borehole respectively. The research results show that the gas flow method could determine the effective drainage radius more accurately than the pressure index method,then it drew a conclusion that the effective drainage radius in Ⅱ i coal seam of Guocun Coal Mine is 1 meter in 14 days.