Abstract
In tropical volcanic countries such as Indonesia, residual soil covers most of the islands; as the weathering process of igneous, sedimentary and metamorphic rocks is still actively undergone due to the tropical climate. The objective of this paper is presented the effect of drying-wetting cycle’s repetition on the static and dynamic properties of three natural residual soils. The laboratory and field test results from three residual soils show that, the void ratio decreased with clay content, the cohesion were increase with clay content. Drying-wetting cycle’s repetition reduces void ratio, negative pore-water pressure, cohesion and internal friction angle of soils. On the other hand, the unit weight of soil and shear modulus (GUBE) increase with the number of cycles. The cohesion after the sixth cycle reduce 8,70%, 9,09% and 1,5% respectively. Shear modulus (GUBE) after the sixth cycle for all undisturbed residual soils increase 25,46%, 24,15% and 11,25% respectively. As the soil densities and void ratio were increase, the soil cohesion were decrease.
