FUNDAMENTAL STUDY FOR SOIL SCOURING WITH A SLIDING SECESSION PROCESS BY USING A STABILIZED ISPH METHOD

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  • 安定化ISPH法による滑動離脱過程を有する洗掘現象の基礎検討

Abstract

In 2011, Tohoku-Kanto earthquake tsunami caused serious damage on the port structures such as breakwater and seawall. Damage mechanisms of these structures have been studied in the past, and there are mainly three causes; I. horizontal force due to the water level difference between the front and rear breakwater, II. piping destruction associated with the decline of the bearing capacity by seepage flow and III. soil scour and erosion behind the seawall during overflow. Fluid-Structure-Soil coupling simulation is desired for a systematic comprehension of seawall collapse mechanism, and it may help to develop next disaster prevention method. In this study, a particle simulation tool based on the SPH has been developed to solve soil scour problem. By using the empirical equation based on the correlation between shear velocity and sediment discharge, we implemented the numerical analysis to replicate phenomenon of scouring in the back of breakwater. The experiment tests with 1/25 scale breakwater are utilized for the validation of our numerical simulation model, then we have discussed the applicability and limitation of the empirical equation.

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