Torrential or atomized rain is one of the key factors that lead to slope deformation and failure. With rain water infiltration, the pore pressure increases and the matric suction decreases even lose, which lead to the soil shear strength sharply reduced and the slope destabilized. This paper selects the in-situ red clay of the Naji reservoir in Guangxi province as research object and investigates the stress-strain characteristics of undisturbed unsaturated red clay under different matric suction conditions by the triaxial test. The numerical verification of test results is conducted by finite element software ABAQUS, using Duncan-Chang model and Mohr-Coulomb model respectively. Comparing with the Duncan-Chang model, Mohr-Coulomb model can reflect the stress-strain behavior of red clay better. And the slope stability of the project in rainfall condition is analyzed by numerical model, which would offer references for the implementation of the revetment engineering.

Ship wave is one of the key factors that affect slope stability of inland waterway because of scour and corrosion. In this paper, the investigations on the softening index, the residual strain and the shear strength with cyclic loading of saturated clay were carried out through cyclic triaxial shear tests in conditions of three different ambient pressures in Naji area on the upper reaches of You River in Guangxi. The relationship between softening index and vibration times, the relationship between residual strain and vibration times as well as the shear strength discounting ratio curve varying with cyclic loading were obtained. Based on the tests, the finite element model of inland waterway slope was founded to analyze the stability of inland waterway slope under effect of ship wave.