Abstract: Based on the dynamic consolidation theory of saturated soil, the behavior of a caisson dyke under ocean waves was predicted using finite element analysis codes- SWANDYNE II. The cyclic stress-strain behavior of seabed soil was modeled by a generalized plastic model, Pastor-Zienkiwicz Mark III model, and cyclic triaxial tests were performed to calibrate the main model parameters. Only the action of ocean waves directly on the structure was considered, while the action of traveling waves on the surface of seabed was neglected in the analysis. The result of the dynamic response analysis was the same in nature as that of pseudo-dynamic limit equilibrium analysis. The dynamic response analysis also provided with the distribution of the displacement, stress and excess pore water pressure of the system, as well as the cumulative process of the structure displacement with wave duration time. The broad prospect was presented of application of dynamic consolidation finite element analysis in offshore and coastal geotechnical engineering field.

Key words: sediment-protecting dyke, dynamic consolidation, ocean waves, finite element analysis