煤矿瓦斯有效抽放半径的测定计算方法

Measuring and Calculation Method of Borehole Effective Gas Drainage Radius

为了测定煤层钻孔的有效抽放半径并探索合理的计算公式,将钻孔瓦斯涌出初速度、瓦斯压力、钻孔瓦斯浓度等作为测定考察指标,在2个不同煤矿对同一煤层进行了测定研究。试验结果表明:钻孔瓦斯涌出初速度、钻孔瓦斯浓度这2个指标易于考察,规律性强,能够有效反应钻孔抽放的影响范围。在现场测定考察研究的基础上,利用灰色关联理论及方法,提出了瓦斯抽放钻孔有效抽放半径的计算公式。

In order to measure the effective drainage radius of the borehole in seam and to discover the rational calculation formula,the initial gas emission velocity from the borehole,gas pressure,borehole gas density,and others were taken as the investigation indexes.A measurement study was conducted in same seams of two different mines.The test results showed that the two indexes of the initial gas emission velocity from borehole and the borehole gas density would be easy to be investigated,would have a law and co...