The response of a sandy seabed underneath a caisson breakwater has been investigated by large scale experiments and numerical simulations. Under dynamic and cyclic wave loads residual pore pressure in sand foundations may occur, when the drainage of the foundation soil is restricted. Dissipation of residual pore pressure causes a densification of the soil, thus reducing the generation rate of excess pore pressure. This behavior is presented based on measurements and numerical investigations, which have been performed with COBRAS (hydrodynamic model) and DIANA-SWANDYNE II (FEM for structure and foundation). The results indicate that a combination of these two numerical models, even uncoupled, is very appropriate to describe the complex interaction between wave, structure and foundation.
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