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KEYWORD: dry density; unsaturated soil; soil water characteristic curve; VG model ABSTRACT: The soil water characteristic curve is a important parameter that expresses the unsaturated characteristic of water holding and moisture migration. With filter paper method, the matric suctions of soil samples in six water contents and three dry densities are measured, and the soil water characteristic curves in different dry densities are obtained. Then the soil water characteristic curves are fitted with VG model. The effects of dry density on soil water characteristic curve and the parameters of VG model are discussed. The results show that for the clay in different dry densities the parameter the residual mass water content in VG model of soil water characteristic curve is a constant. The parameter a is linearly correlation with the reciprocal of air entry value. The dry density has great influence on soil water characteristic curve, so the influence must be considered in the analysis of moisture migration with hydro-mechanical coupling.

Effects of dry density on soil water characteristic curve of clay