Abstract
The effects of normal stress and soil water conditions on soil strength and the process of shear deformation were estimated with a simple shear test using Toyoura standard sand. The simple shear test was able to depict shear deformation and was executed under low normal stress conditions that reproduce shallow landslides. This paper proposes an equation that describes the relationship between shear stress and shear strain. The equation corresponds well with the results of shear tests.
The effects of normal stress and soil suction on the shear deformation process between shear stress and shear strain were explained by variation of the equation parameters. A response analysis of the equation parameters clearly separated and explained two suction effects due to effective stress and another not due to effective stress.
