Abstract
While slope failures due to torrential rain occurs frequently in all over the country, it is used two-dimensional saturated-unsaturated flow analysis by finite element method and limit equilibrium method in many of the design practices and various research. In addition, osmosis water pressure of the unsaturated zone obtained by flow analysis is not considered to slope stability evaluation. Therefore, in this study, the coupling was carried out analysis of the seepage and stress by the shear strength reduction method using a simple model of masa soil. In addition, osmotic pressure and torrential rains of the unsaturated zone was carried out the impact study on the stability of the slope. And it was further applicability verification of the design practices of the limit equilibrium method by comparison with the sliding safety factor by comparison with the conventional method. It showed that conventional method is not applicable cases.
