Evaluation of SWCC Curves and Undrained Shear Parameters at Different Densities and Saturations of Unsaturated Clay

Abstract

The behaviour of unsaturated soils in terms of physical and mechanical properties is somewhat different than typical saturated soils. Undrained shear parameters of soil having an unsaturated state are analysed. Moreover, the influences of moisture content and dry density are also observed. The saturation of the specimens ranges from 20%, 40%, 60% and 80%, and the dry density ranges as per standard Proctor density and modified Proctor density of particular soil type. Fredlund's modified Mohr–Coulomb failure envelope is used to evaluate undrained shear parameters of unsaturated soils. The soil matric suction is evaluated using a contact filter paper technique. It is an effort towards how soil compacted fills and slopes have behaved after its construction while they are exposed to the natural environment.