Abstract
In order to predict the occurrence of rainfall-induced landslide by monitoring (measurement) of surface displacement, simulation model of surface displacement of shallow slope due to rainfall has been already developed. In the model, a change of stress due to the change of matric suction is evaluated in a suction-induced bond stress. In this study, suction-induced bond stress is newly expressed by Karube's equation using Soil water characteristic curve (SWCC) derived easily by infiltration test of undisturbed sample. And it is applied to the simulation of the surface displacement due to middle-scale rainfalls at the granite slope in Hiroshima in order to show the applicability of the model for the simulation. It reveals that the improved model simulates observed surface displacement relatively well. And the larger the suction-induced bond stress correspond to some suction value, the greater the calculated shear strain of the soil layer. It causes the large surface displacement with large suction-induced bond stress.
