当降雨强度小于土体的饱和渗透系数时，表层土体达不到饱和状态，最终的稳定入渗只能达到一个非饱和入渗状态。
If the infiltration intensity is less then the saturated permeability coefficient, the surface soil finally reaches to an unsaturated infiltration stage instead of saturated infiltration stage.
根据土水特征曲线可以确定非饱和土的强度、体应变和渗透系数，甚至可以确定地下水面以上水份分布。
Strength, volumetric strain and permeability coefficient, and even moisture-distribution above ground water surface can be determined by the soil-water characteristic curve.
介绍的实验室方法——自然降压法，结合实验数据，给出一个测量非饱和湿沥青样品空气渗透系数的方法。
This paper develops a model for measuring air permeability of partially saturated asphalt samples using falling-pressure method in laboratory introduced by Li et al.
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