To improve the stability of a caisson type breakwater against wave force, it is effective to provide back-filling behind a caisson. To evaluate the effectiveness of the back-filling behind the caisson, it is necessary to clarify the interactive resistance of the caisson, the back-filling and the rubble foundation against wave force. However, it is thought that these effects are not clarified yet. Therefore, a series of the centrifuge model experiments has been carried out to clarify these effects. In these experiments, horizontal static load was applied to a model caisson with back-filling, and a sliding failure surface was evaluated from the deformation of back-filling and rubble foundation. Besides, the elasto-plastic FEM analysis was carried out to find out a sliding failure surface, and the stability of a caisson with back-filling was evaluated using the circular arc failure method considering the forces acting on back-filling and rubble foundation. As the results of the comparison between the experiment results and those calculated, both of the sliding failure surfaces fitted well, and it was conformed that the circular arc failure method is applicable as a design tool to evaluate the stability of the caisson with back-filling.
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