LAUSR

Abstract This study is an application of the integrated numerical model FSSI-CAS 2D, to predict the subsidence of a huge rubble mound breakwater in the west part zone at Yantai port. The modified Cambridge clay soil model and poro-elastic model are adopted to describe the quasi-static mechanical behavior of the seabed foundation, which is consists of muddy-clay, clay and silt soil layers. The model parameters of soil used in computation are estimated based on a great number of laboratory tests (over one thousand). A novel point is that the buoyancy applied on the rubble mounds under SWL (Static Water Line), as well as its nonlinear variation dependent on the deformation of seabed foundation are considered in computation. Through analytical and experimental verification, as well as the comparison with observation data monitored in-situ, it is indicated that FSSI-CAS 2D is reliable to numerically predict the subsidence of offshore structures, and has the ability to be applied in practical engineering.