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渗透性影响土体工程地质特性与力学行为,要对渗透系数进行理论估算相当困难。为应用泊肃叶定律建立土体渗透系数的估算模型,引入等效渗透管径概念并推导其关系式,利用针对性渗透试验对模型合理性与适用性进行校验。结果表明:土体内部渗透通道可借助等效性原理给予等效细管化;等效渗透管径的关系式,能够考虑土体密实度、结合水含量和颗粒级配、排布方式、几何形状等;模型的计算结果与试验数据较为一致,在误差控制方面表现良好。基于泊肃叶定律的土体渗透系数估算模型,各关键参量具有相对严格的物理背景,物理含义较为明确;可能适用的土体粒径范围为0.002~0.500 mm,大致覆盖上至中砂粒、下至粗粘粒包含的区间。
Permeability affects the engineering geological characteristics and mechanical behavior of soil, and it is difficult to theoretically estimate the permeability coefficient. In order to apply the Poiseuille’s law to establish an estimation model of the permeability coefficient of soil, the concept of equivalent permeation pipe diameter was introduced and its relation was deduced, and the targeted penetration test was used to verify the rationality and applicability of the model. The results show that the internal permeation channels of the soil can be equivalently thinned by means of the equivalence principle; the relation of the equivalent permeation pipe diameter can consider the soil compaction degree, the combined water content and the particle grading, arrangement, geometry The shape, etc.; The model’s calculation results are in good agreement with the experimental data and perform well in error control. The soil permeability coefficient estimation model based on Potus method, each key parameter has a relatively strict physical background, the physical meaning is relatively clear; possible application of soil particle size range is 0.002 ~ 0.500 mm, roughly covering up to the middle sand, under To the interval that the coarse clay contains.