Study on the Shear Deformation of Unsaturated Sandy Soil with Increase of Degree of Saturation

概要

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In order to examine the suction-strain relations, suction unloading tests with constant axial and lateral pressure in an unsaturated triaxial compression test apparatus were carried out. As results, following facts were made clear. As suction decreases, principal strains becomes larger and strain increment also becomes larger. And if principal stress ratio and mean principal stress becomes larger, principal strains progress in larger suction region. This relation can be converted into that of degree of saturation to shear strain. In this case, effect of increase of principal stress ratio to progress of shear strain is larger than that of mean principal stress. Next, in order to predict suction-strain relation, consitutive equation for unsaturated sandy soil was proposed. The equation is a stress-strain relation on CMP, with stress correction with homogeneous bond stress on 6-axis originated from suction in the equation. This new model could simulate the results of suction unloading tests well, so the model is thought to be able to predict suction-strain relation of unsaturated sandy soil.
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