Abstract
Residual soils derived from the in-place weathering of parent rocks represent the predominant type of earth materials in those parts of the world where slope failures are very prevalent. However, residual soils have received very little attention from the geotechnical community. Residual soils are invariably unsaturated and the stability of slopes in such soils is mainly governed evidently by the shear strength behaviour of unsaturated soils and the effect of rainwater infiltration. This paper summarizes some of the laboratory and field tests that had been carried out on unsaturated residual soils in Malaysia. Some of the catastrophic rainfall-induced slope failures in these soils are also described.
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