Bore-induced Dynamic Responses of Revetment and Soil Foundation

摘要

Tsunami take away life,wash houses away and bring devastation to social infrastructures such as breakwaters,bridges and ports.The coastal structure targeted object in this study can be damaged mainly by the wave pressure together with foundation ground failure due to scouring and liquefaction.The increase of excess pore water pressure composed of oscillatory and residual components may reduce effective stress and,consequently,the seabed may liquefy.If liquefaction occurs in the seabed,the structure may sink,overturn,and eventually increase the failure potential.In this study,the bore was generated using the water level difference,its propagation and interaction with a vertical revetment analyzed by applying 2D-NIT(Two-Dimensional Numerical Irregular wave Tank) model,and the dynamic wave pressure acting on the seabed and the surface boundary of the vertical revetment estimated by this model.Simulation results were used as input data in a finite element computer program(FLIP) for elasto-plastic seabed response.The time and spatial variations in excess pore water pressure ratio,effective stress path,seabed deformation,structure displacement and liquefaction potential in the seabed were estimated.From the results of the analysis,the stability of the vertical revetment was evaluated.