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

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  • MLSによる応力補正を導入した弾塑性粒子法によるケーソン防波堤の津波越流洗掘解析
  • MLS ニ ヨル オウリョク ホセイ オ ドウニュウ シタ ダン ソセイ リュウシホウ ニ ヨル ケーソン ボウハテイ ノ ツナミエツリュウ センクツ カイセキ

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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.

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