Dynamic Response Of Free Seabed Under Wave Loading Based On Stream Function Theory

Marine constructions must be built on firm foundations. These foundations areoften buried in marine soil, which is a kind of multiphase porous media. In suchcircumstance, shallow wave and deep sea currents are normally met with.In order tosimulate the actual wave, force and deformation characteristics of marine soil reasona-bly, numerical simulation is used to study the following tasks:1) the stream function wave theory is introduced, part of the results with relatedresults calculated by linear wave theory obtained were compared; the advantages ofthe stream function wave theory in considering the role of ocean currents is explored;wave pressure based on stream function waves in the sea with time and space distribu-tion is derived, which is used to simulate wave loading;2) seabed is assumed to be a two-phase fluid-saturated porous media. Based onelastic wave equation of two-phase fluid-saturated porous medium. Explicit gradualintegration time domain finite element method format and local transmission artificialboundary is used. Seabed dynamic response under wave loading were calculated andanalyzed;3) wave-induced dynamic water pressure was calculated by stream functiontheory, with consideration of dynamic water pressure caused by an earthquake. Takethe Hongkong-Zhuhai-Macao Bridge contruction site as example, dynamic analysisby the impact of water stress on soil properties, based on the NERA software wereperformed. The dynamic response of a one-dimensional space under the combinedeffects of the earthquake and the wave action were illustrated, the preliminary stabilitywere analysed.