NUMERICAL SIMULATION ON CAISSON BREAKWATER FAILURE DUE TO TSUNAMI OVERTOPPING USING PARTICLE-BASED ELASTOPLASTIC MODEL WITH MODIFICATION OF STRESS BY MLS

Abstract

 In a particle-based elastoplastic model, it is difficult to eliminate numerical noise because of its explicit algorithm. Moving Least Square is one of the method to modify a physical quantity and based on the approximation that it can be described by the Taylor series expansion. In this study, MLS is introduced to modify a stress field that includes numerical noise. Moreover, Particle Shifting is also applied to obtain more accurate stress field. The present model is applied to a numerical simulation on a caisson breakwater failure due to tsunami overtopping. In a series of failure process of a caisson breakwater including a tsunami overtopping, a scouring of mound and soil foundation behind a caission and fall of the caisson into a scour hole, a calculation that stress noise does not emerge clearly is realized.