承压状态下破碎砂岩气体渗透率试验研究

Preliminary Study on Laws of Steady State Seepage of Gas in Over-broken Rock Mass

考虑破碎岩体中气体渗流的非达西效应,依据气体渗流的非线性动力学方程,推导了破碎岩体中的一维稳态气体渗流的压力场分布规律,即沿着渗流方向,气体压力的平方呈线性下降。结合气体渗流试验数据,计算了不同粒径、荷载条件下的破碎砂岩气体渗透率。结果表明:岩石破碎程度越高,其对气体的传输能力就越弱,气体渗透率越低。

Considering the non-Darcy effect of gas seepage in over-broken rock mass, regularity of the pressure field distribution of one-dimensional steady gas seepage in broken rock is obtained based on the nonlinear dynamical equations of gas seepage, which states that along the flow direction the square of the pore pressure descends linearly. Besides, the permeability of over-broken sandrock is obtained according to the gas seepage experiment. The result indicates that:the greater degree the rock breaks,the weaker its ability of gas transmission gets, thus, the permeability is lower.