ANALYSIS OF UNSATURATED CYCLIC TRIAXIAL TEST BY USE OF SOIL WATER CHARACTERISTIC CURVE AND CONSTITUTIVE MODEL OF SOIL SKEOLETON CONSIDERING EFFECT OF VOID CHANGE

Abstract

In order to increase accuracy of predicting the dynamic behavior of unsaturated soil, the method was proposed in which the change of void during cyclic loading was considered in the constitutive model of soil skeleton and the soil water characteristic curve. Moreover, the scanning curve which aims to the main wetting curve was also prepared.
These methods were employed in the governing equations of cyclic triaxial test in undrained water and air conditions. For the validation of the methods, the simulations of two kinds of the cyclic unsaturated triaxial tests were performed. It was revealed that the simulations in consideration of these methods could successfully describe the decrease of suction and skeleton stress and the amount of deviatoric stress observed in experiments.