地震作用下防波堤结构地基液化及变形分析

摘要

采用有限差分软件FLAC3D,对防波堤结构地基地震响应进行了分析和计算,重点给出了地基液化程度和变形情况.计算结果表明:在强度较小地震作用下,防波堤结构地基破坏的程度较小,可以正常使用;在较强地震作用下,防波堤结构地基出现了较明显的孔压增长和位移变化.当地震加速度峰值提高到0.2g后,防波堤地基出现明显液化现象,液化区域主要集中在右侧上层.地震引发的防波堤变形对结构整体安全影响较小,对安全性影响的主要因素是砂土液化,会造成结构不同程度的破坏.%In this paper,the seismic responses of the structure foundation breakwater are analyzed and calculated using the finite difference software FLAC3D,including the emphasis on the degree of foundation liquefaction and deformation.Calculations results show that:under the strength of the smaller earthquake conditions,the breakwater structure foundation analysis is a smaller extent of the damage,and can be used normally;In the role of a strong earthquake conditions,breakwater structure can be liquefied at part of the foundation.There have been obvious changes in pore pressure and displacement variations.When the peak acceleration exesses 0.2 g the structure foundation is liquefied,Breakwater structure is a clear foundation liquefaction phenomenon,Liquefaction areas are mainly concentrated in the upper right side of the structure.Deformation of breakwater under the seismic action has a relatively small impact on overall structure safety,and the main influence factor of the security is sandy soil liquefaction which will damage structure to varying degrees.The research results on this paper can provide reference for seismic design of similar projects.