The behaviour and properties of unsaturated soils have attracted increasing attention world-wide. To improve our understanding of unsaturated soil behaviour and properties, this paper investigates and summarises some recent findings on the soil-water characteristics, small strain stiffness and shear strength of unsaturated soils. Measured results obtained from laboratory tests on recompacted and natural specimens and in-situ tests are compared and discussed. This paper focuses on decomposed geomaterials, which are relatively not well studied but relevant to many parts of the world.




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