遮帘式板桩码头地基地震液化破坏机理

发布时间：2018-05-19 23:03

本文选题：遮帘式板桩码头 + 地震液化　；参考：《地震工程学报》2015年02期

【摘要】：遮帘式板桩码头作为一种新型的板桩结构型式,其抗震性能研究是设计建造过程中的重要环节。在FEM-FDM水土耦合计算的平台上引入循环弹塑性本构模型,借助FORTRAN编程软件形成饱和砂土动力液化分析的数值方法,可有效模拟饱和砂土在地震动力作用下的非线性及大变形特性,同时也可模拟砂土液化流动对遮帘桩和前墙的动土压力。研究表明:地震作用下可液化土层超孔隙水压力比增长并发生较大的水平流动变形,对前墙的水平破坏大于竖向破坏;前墙剪力最大值位于海床与前墙交界处;遮帘桩剪力最大值位移与前墙底平行的位置;后拉杆拉力逐渐变大,前拉杆拉力逐渐变小。通过对板桩码头地震液化灾害的分析,可为抗震和抗液化设计提供参考依据。
[Abstract]:As a new type of plate pile structure, the seismic behavior of sheet-pile wharf is an important part of design and construction. The cyclic elastoplastic constitutive model is introduced on the platform of FEM-FDM soil and water coupling calculation, and the numerical method of dynamic liquefaction analysis of saturated sand is developed by means of FORTRAN programming software. The nonlinear and large deformation characteristics of saturated sand under seismic dynamic action can be effectively simulated. At the same time, it can simulate the dynamic earth pressure of sand liquefaction flow on curtain pile and front wall. The results show that the excess pore water pressure ratio of liquefiable soil layer increases and the horizontal flow deformation occurs, and the horizontal damage to the front wall is greater than the vertical failure, and the maximum shear force of the front wall lies at the junction of the seabed and the front wall. The maximum displacement of the shearing force of the curtain pile is parallel to that of the front wall, and the pull force of the back rod becomes larger and the pull force of the front rod becomes smaller. Through the analysis of seismic liquefaction disaster of plate pile wharf, it can provide reference basis for seismic and anti-liquefaction design.
【作者单位】：大连理工大学建设工程学部岩土工程研究所;大连理工大学海岸与近海工程国家重点实验室;
【基金】：国家高技术研究发展计划863资助项目(NO.2012AA112510)
【分类号】：U656.112

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