钻进过程中孔壁瓦斯涌出规律研究

Study on the Law of Gas Emission from Borehole Wall in the Drilling Process

出于预测煤巷煤与瓦斯突出危险性的连续流量法研究的需要,以Darcy渗透定律为基础,分析了钻进过程中孔壁瓦斯动态涌出的特点,并在一定的简化和假设条件下,以FLAC3D为工具,建立了孔壁瓦斯动态涌出的Mohr-Coulomb圆柱体渗流模型。研究结果表明:孔壁瓦斯涌出速度随钻进深度的增加而增大,停钻瞬间达到最大;孔壁累计瓦斯涌出量也随钻进深度的增加持续增大。

For the need of the research on continuous flow method to forecast coal and gas outburst in coal roadway,based on Darcy s seepage law,the characteristics of dynamic gas emission from borehole wall in the drilling process were analyzed,and then under some simplifications and hypothesis,a Mohr-Coulomb cylinder seepage model about dynamic gas emission from borehole wall was founded using FLAC3D.The results of research show that the emission velocity of gas from borehole wall increases continuously with the dep...