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The Influence of Net Normal Stresses on the Shear Strength of Unsaturated Residual Granite Soils  

성상규 (고려대학교 토목환경공학과)
이인모 (고려대학교 토목환경공학과)
Publication Information
Journal of the Korean Geotechnical Society / v.19, no.2, 2003 , pp. 27-38 More about this Journal
Abstract
The characteristics and prediction model of the shear strength of unsaturated residual granite soils were studied in this paper. In order to investigate the influence of the net normal stress on the shear strength, unsaturated triaxial tests and SWCC tests were carried out by varying the net normal stress. Experimental data for unsaturated shear strength tests were compared with predicted shear strength envelopes obtained from existing prediction models. It was shown that the soil-water characteristic curve and the shear strength of the unsaturated soil varied with the change of the net normal stress. Therefore, to achieve a truly descriptive shear strength envelope for unsaturated soils, the effect of the normal stress on the contribution of matric suction to the shear strength has to be taken into consideration. In this paper, a modified prediction model f3r the unsaturated shear strength was proposed.
Keywords
Net normal stress; Prediction model; Soil-water characteristic curve; Unsaturated shear strength;
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