Seismic Liquefaction Analysis Of The Foundation Of A New Port Breakwater

In areas prone to earthquakes,seismic design of newly-built buildings?structures?is essential to reduce the damage of buildings?structures?.A new port is located in an earthquake-prone area.The proposed port site contains a layer of loose sand.To ensure the safety of important structures such as breakwaters,an analysis of the site's seismic liquefaction is required.This article uses FLAC and FLAC^3D to analyze the liquefaction situation of the site under the seismic load for the slope-type breakwater of the port,and mainly carries out the following work:?1?Using FLAC,the dynamic response of the breakwater and the sand layer is analyzed on a section of the west breakwater under the application of a peak acceleration of 0.5g in the horizontal direction.The calculation results show that the sand layer in the foundation beneath the breakwater is partially liquefied,and the breast wall sinks and deflects.?2?Under the consideration of both horizontal and vertical ground motions,FLAC^3D is used to perform a three-dimensional dynamic response analysis on a certain section of the west revetment breakwater.The seismic wave used in the calculation is Kobe wave.The calculation results show that during the 95-year recurrence period,the residual deformation of the breakwater under earthquake action is small,and the maximum horizontal and vertical deformation is only a few centimeters.The maximum vertical settlement of the breakwater is31.1 cm,and the maximum horizontal displacement is 42.5 cm.The sand layer below the breakwater is partially liquefied.?3?Refill and strengthen the calculated liquefaction zone,and perform three-dimensional calculations for the 475-year return period conditions.The calculation results show that the residual deformation of the superstructure becomes smaller after replacement,and the site does not liquefy.