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基于裂隙局部开度为平行板模型的假定， 按一定分布抽样生成裂隙面上开度随机数， 并分别对单裂隙饱和及非饱和渗流进行了数值模拟。裂隙饱和及非饱和渗流在渗流机理上都是由于水势差引起的， 只不过在非饱和渗流情形下， 湿润相水压力小于非湿润相空气的压力。饱和渗流时，水流主要集中在大开度， 即 “沟槽”中； 而非饱和渗流时， 水流运动多发生在小开度， 即 “狭缝”中。
Based on the assumption that the local crack opening is parallel plate model, random numbers of opening on the fracture surface are sampled according to a certain distribution, and the numerical simulation of the single fracture saturated and unsaturated seepage is carried out respectively. Fissure saturation and unsaturated seepage are both caused by water potential difference in the seepage mechanism, except that in the case of unsaturated seepage, the wet-phase water pressure is less than the pressure of the non-wetting phase air. When saturated seepage, the water flow is mainly concentrated in the large opening, ie, the “groove”. When the seepage is not saturated, the water flow occurs in a small opening, ie “slit”.