ABSTRACT
Landslide is one of severe natural disasters all over the world. Actually, this can be divided into the 3 research fields in general. The first one is landslide, where is currently sliding in the mountain, with its sliding zone is specified by geologists based on soil investigations. The second one is land collapse by the rainfall or earthquake. The third one is mud water flow mixing soils and gravels. The numerical procedure could simulate at displacement of slope by rain at a site of slope in Hiroshima Japan. This is very unique because many researches focus on either water or deformation. The water saturation also increased on the stepped curve with three stages at the each depth VW4, VW5, VW6 at the upper portion of slope. Two different slope deformation processes to collapses were obtained with the same conditions of slope angle and rainfall.
