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为研究岩石节理张开度的概率模型，将节理抽象成界面层，根据含贯通节理的岩石压缩变形特征，确定节理的平均力学张开度。根据节理非饱和渗流试验测定的毛细压力与饱和度的关系推断节理张开度的概率分布类型和分布参数。研究表明，单参数的Gamma分布可合理地表征节理张开度的随机分布特征；张开度的空间变化可用Monte－Carlo法模拟，从而为进一步研究岩石节理的非饱和渗透特性创造条件。
In order to study the probability model of the open degree of rock joints, the joints are abstracted into the interface layer. Based on the compressive deformation characteristics of the rock with through-going joints, the average mechanical openness of joints is determined. According to the relationship between the capillary pressure and the saturation measured by the unsaturated seepage test, the types of probability distribution and the distribution parameters of the joint opening are deduced. The results show that the single parameter Gamma distribution can reasonably characterize the stochastic distribution of the joint opening degree. The spatial variation of the opening degree can be simulated by Monte-Carlo method, which can create the conditions for further studying the unsaturated permeability characteristics of rock joints.