岩石节理非饱和渗透特性初步研究

A preliminary study on unsaturated permeability of rock joints

利用不溶混驱替的方法，在室内精确地观测了花岗岩节理非饱和渗透排泄和吸湿过程，探讨了节理非饱和渗透机理，提出了基于节理张开度概率分布的毛细压力与饱和度的解析模型以及节理非饱和水力传导度的理论表达式。研究表明，单节理非饱和渗透特性与二维非均质多孔介质具有一定的相似性，文中提出的有关模型可作为确定岩石节理非饱和渗透参数的参考方法。

With the method of immiscible displacement, the drainage and imbibition curves are accurately measured for a single joint in granite sample. The mechanism governing the unsaturated flow in the joint is discussed on the basis of the data obtained from the test. According to the probability distribution, an analytical model for the relationship between capillary pressure and saturation, and an expression for unsaturated hydraulic conductivity are put forward. The studies show that the unsaturated hydraulic conductivity of a single joint has certain similarities to that of porous media; the models proposed in this paper can be used as a reference method for deterimining the unsaturated seepage paramenters of rock joints.