This paper performs laboratory model tests for simulating the slope failure due to vibration, and indicates that a slope failure during earthquake tends to occur when a cumulative plastic deformation exceeds a certain critical value. Based on the result, this paper proposes a numerical procedure to evaluate the slope stability during earthquake, in which the cumulative plastic deformation is calculated by a dynamic analysis using seismic wave, and in which the critical value of deformation is estimated by a static analysis considering seismic intensity.
