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64 ABSTRACT: Monitoring of surface displacement of slope has been widely adopted as time prediction method of shallow landslide due to rainfall. Modeling of shear deformation according to rainfall infiltration is necessary for establishment of the method. In order to examine the constitutive relation for the model, surface displacement, pore pressure at the base, volumetric water content (hereafter, V.W.C.) and suction, shear strain in the sandy model slope are monitored during artificial rainfall. Analysis of the monitored data shows that surface displacement and shear strain in the slope proceed at small rate under unsaturated condition first, then increase remarkably with the rise of pore pressure. Unsaturated component of surface displacement of steeper slope is larger than that of gentler slope. It is likely to be due to that shear strain with the increase of suction is larger in steeper slope while shear strain according to the increase of pore pressure is larger in gentler slope.

Shear Deformation Development and the Increase of Pore Pressure due to Rainfall Infiltration in Sandy Model Slope under Different Inclination