Abstract
Analysis of monitored data of the deformation in sandy model slope under artificial rainfall was conducted in this study. The analysis revealed that the relationship between the surface displacement and the groundwater level in the slope was able to be modified as hyperbolic which is often adopted for the constitutive relation between the shear strain and the stress ratio under direct shear condition of loose sand. New prediction method for the time of the onset of a rainfall-induced landslide was proposed based on the relationship in the slope. Formula for predicting the relationship between time and surface displacement in the slope could be derived by combining regression equation between the time and the groundwater level to that between the surface displacement and the groundwater level at any time during the experiment in the model. The formula could simulate the actual deformation of the model slope well. It suggests the utility of the method for the time prediction of the onset of rainfall-induced landslides.
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