Fundamental Behavior of Unsaturated Widely-Graded Soil
Colluvial soils are widely distributed on natural terrains and often serve as fill materials for earth structures, including embankments, foundations, and slopes. Colluvial soils are characterized as coarse, widely-graded, and often under unsaturated conditions. Related geotechnical problems dealing with natural hazards and disasters such as dam failures, ground settlement, and landslides have demanded increased attention. Most current studies on nsaturated soils primarily focus on fine-grained soils.
How water infiltrates into such coarse soils and how the shear strength of these soils decreases during water infiltration are not well understood. Also, it is not clear how coarse granular particles affect water infiltration and groundwater flows into the soil
deposits. To answer these questions, several challenging scientific issues need to be addressed on the soil-water characteristics, hydraulic conductivity, and shear strength of these coarse soils.
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