Effect of stress state on the unsaturated shear strength of a weathered granite

Abstract

The effect of urea state on the unsaturated shear strength of a Korean residual soil was studied using modi¬fied triaxial tests. Experimental results show that the soil-water characteristic curve and shear strength of this soil arc significantly affected by the change of net normal Stresses. This effect should be taken into consideration in the model to precisely describe the shear strength envelope of unsaturated soils. Thus, a new model for estimation of unsaturated shear strength is proposed using the soil-water characteristic curve and the saturated shear strength parameters.