Slip Failure Analysis and Evaluation of Wave Pressure Effects on Rubble Mound Breakwater using the Strength Reduction Method

This study performed a slip failure analysis and evaluated the structural stability of a rubble mound breakwater under wave pressure using the strength reduction method (SRM).The reliability of the SRM was verified by reproducing the results of a conventional slope stability analysis using ABAQUS finite element analysis.Considering the wave pressure distribution acting on the crown wall, the slip failure behavior within the rubble mound was analyzed.The analysis results showed that, under the sectional configuration and material properties adopted in this study, a non-circular slip failure surface was formed at a wave height of 7m, and the factor of safety was estimated to be approximately 1.68.In addition, uncertainty analysis using the Latin hypercube sampling was conducted to derive the fragility curve of the rubble mound breakwater with respect to variations in wave height.The results demonstrated that the probability of failure increased rapidly with wave height, and the critical wave height was evaluated to be approximately 6.85m.This study demonstrates the effective applicability of numerical analysis based on SRM to the wave-resisting stability and fragility evaluation of rubble mound breakwaters.