CONSOLIDATIION OF 2-D POROUS UNSATURATED SEABED UNDER A COMPOSITE BREAKWATER

This paper uses the Dynamic Biot's equation as the governing equation, and adopts the finite element method for space discretization and the generalized Newmark- for time discretization. A computational program PORO-WSSI 2D is developed for the consolidation and dynamic response analysis of seabed foundation. It is based on the program SWANDYNE which is for earthquake analysis. The consolidation modulus in PORO-WSSI 2D is validated by the Terzaghi 1D consolidation theory. Applying the PORO-WSSI 2D,the consolidation process and the final consolidation status of seabed foundation under a large-scale composite breakwater and hydrostatic water pressure are intensively investigated. The computational results indicate the PORO-WSSI 2D can effectively analyze and evaluate the consolidation process, and predict the shear failure of seabed foundation under marine structures.the final consolidation status determined also can provide the initial conditions as true as possible for the later analysis of liquefaction and shear failure in seabed foundation under the ocean wave or earthquake loading in engineering.