可变形多孔介质渗透系数的测定方法

A Testing Method for Determining the Permeability of Deformable Porous Materials

在Ｂｉｏｔ理论基础上给出可变形多孔介质耦合渗流基本方程；求出小试件一维定常耦合渗流问题的解答；表明在一维流固耦合情况下试件内部压力梯度有明显的非均匀性。因此通过实验确定可变形多孔介质渗透系数在数学上可归结为微分方程的反问题，传统的测试渗透系数的方法需要改进。介绍了可变形多孔介质渗透系数的测试原理和测试方法。对粒状多孔材料实验的结果表明，传统实验方法得到的渗透系数误差较大。

Based on Biot′s theory, a system of equtions which describes the coupled flow of pore fluids in deformable porous material is presented. The analytical solution for one dimensional steady flow is derived to show that the gradient of pore pressure in a one dimensional testing sample is non homogeneous owing to the interaction between fluid phase and solid phase, and that the traditional method for determining the permeability of porous materials, which adopts the assumption that the pore fluid pressure in testing sample is homogeneous, has to be improved. An improved test principle and relevant measuring method for determining the premeability of deformable porous materials are suggested. Experiments on granular porous aggregate are given. Results are compared with the permeability value from traditional test.