静水条件下砂岩渗透性的试验研究

在TRIAXIAL CELL V3岩石三轴伺服试验机上进行了砂岩的渗透试验，采用流量法测量不同围压和渗透压作用下的砂岩渗透率，揭示了围压和渗透压对砂岩渗透率的影响规律，并给出了围压与渗透率的拟合关系式。结果表明，在相同围压下，随着渗透压差的增加，砂岩渗透率呈不同程度的增加；围压越小，渗透压差对渗透率的影响越大；当渗透压差相同时，砂岩围压一渗透率曲线变化趋势基本一致，渗透率随围压的增加而减小，显示砂岩内部裂隙的闭合程度受围压的影响较明显。

Experimental Study on Seepage Properties of Sandstone in Hydrostatic Condition

A series of permeability tests of sandstone under different confining stresses and seep- age pressures were carried out by using a servo-controlled rock mechanical test system named TRIAXIAL CELL V3. The test results indicate that the permeability of sandstone varies with confining stress and seepage pressure. On one hand, the permeability increases with seepage pressure under the same confining stress, and the results show that for small confining pressure permeability pressure has a great influence on permeability. On the other hand, the confining stress-permeability curve of sandstone has the same variation trend at the same seepage pressure. The permeability decreases with confining pressure due to the closure of microfissures. Further- more, the fitting equations are presented for interpreting the relationship between permeability and confining pressure.