This paper presents a study of stability of a trial quay wall of large diameter cylinders at the Yangshan Port, China. Stability analysis of the quay wall during construction is carried out using finite element method. The results of the analysis indicate that a turnover failure is potential for the single cylinder subjected to a five year design wave action. The case when the cylinder is empty is the critical situation during construction. Filling the cylinder right after the installation is an effective way to increase the stability. After the quay wall has been formed by joining the single cylinders, the safety against overturning is reevaluated. The factor of safety of the quay wall is assessed to be 1.5 under a fifty year design wave action.

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