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试验测定了 5种典型土样和砂样的毛细压力与饱和度的关系曲线 ,用 Leverett函数处理试验结果并与前人的结果进行比较分析 ,得出对于渗透率量级在 10 -7～ 10 -9cm2 间的土和均质砂 ,用 Leverett函数折算的无量纲的毛细压力—饱和度关系曲线可以很好地统一到一条曲线上来 ,且α=0 .65的结果更优。实测的不同饱和度情况下毛细压力水头与数学模拟结果的比较计算表明 ,Van Genuchten的表达式更适合于土的情况 ,而 Broods- Corey的表达式则更符合于砂的情况。
The curves of capillary pressure and saturation for five typical soil samples and sand samples were measured. The experimental results were processed by Leverett function and compared with the previous results. The results show that for the permeability of 10 -7 ~ 10 -9cm2 between the soil and homogeneous sand, using the Leverett function of non-dimensional capillary pressure-saturation curve can be well integrated into a curve up, and α = 0.65 results better. Comparisons of capillary pressure head and mathematical simulation results with different saturation indicate that Van Genuchten’s expression is more suitable for soil conditions, whereas Broods- Corey’s expression is more in line with sand’s condition.