Seismic Dynamic Response Analysis Of Breakwaters On Reclaimed Reef And Foundation

As the infrastructure of reclaimed reef,revetment breakwater is build to resist wave erosion and maintaining the integrity of reclaimed land.Therefore,the stability of revetment breakwater under earthquake must be paid attention to.Although there are many cases of failure and instability of offshore structures under strong earthquakes,there are few studies have been conducted on the dynamic response of offshore structures and foundations under seismic loads.It is very important to understand the dynamic characteristics of breakwater and reef foundation under earthquake for engineering design and maintenance.In this paper,a coupled numerical model FSSI-CAS 2D is used to study the dynamic response of breakwaters on reclaimed reef and foundation system under earthquake,and the amplification effect and absorption effect of foundation under high,medium and low frequency seismic excitation are also studied.The results of numerical calculation show that:when the seismic wave propagates from the bottom to the top in the foundation,the acceleration is amplified in each rock and soil layer,and the reclaimed calcareous sand has a strong amplification effect on the ground motion;the breast wall deflects anticlockwise under seismic loading,and the horizontal cumulative displacement is 9cm;the slope protection,reclaimed calcareous sand layer and Original calcareous sand layer move to the sea,and the slope protection moves 5cm;There are obvious resonance phenomena in the horizontal dynamic response of foundation and breakwaters;Excess pore water pressure induced by seismic excitation and the vibration amplitude is positively correlated with the depth of the point.