软土地基海堤沉降的有限元模拟

围涂工程的海堤直接坐落在软土地基上，致使地基土受到挤淤、排水固结，产生了较大的沉降量。当前计算海堤沉降基本上按照规范规定以分层沉降总和法为主，辅以软土修正系数，对工后沉降要求结合固结计算和类似工程经验等综合分析确定，对不同的设计人员往往会产生较大的计算误差。如何准确判断海积软土在海堤荷载作用下的沉降变形往往是堤防建造和围海造地等重大工程中的关键环节。为研究海积软土的变形特性，在室内试验和实测沉降的基础上，采用plaxis有限元软件对实际的工程项目全过程施工的模拟，认为采用粘性土弹塑性模型对堤坝沉降变形进行平面应变情况的模拟，沉降模拟跟实测比较接近，并能很好地模拟工后沉降，能解决由经验判断产生的较大误差。

Finite Element Simulation on Settlement of Soft Seawall

Reclamation seawall project is located in the soft ground directly, which Caused the compaction of thefoundation soil, consolidation of drainage and resulting in a larger settlementindex Current calcuIations of the seawall settlement is largely based on the specification datas which mainly uses the sum of layer deposition methods, supplemented by soft soil correction factors. And also combined with comprehensive analysis of the settlement after the consolidation of computing and other similar engineering experience. Different designers tend to have different calculation results. How to determine marine soft soil in the seawall settlement deformation under load accurately is always the major key of the construction and land reclamation projects. In order to investoigate the deformation characteristics of marine soft soil, Basedon the laboratory tests and measured settlement, the author by used Plaxis finite element software to simulate the whole process of the actual projects construction. The author find that usling the elastic-plastic model to simulate plane strain deformation of clay dam settlements, simulation results are close to the measured settlement, and also could simulate the post-construction settlements for future purpose,It also can resolve the large errors resulting bv the exDerienee judgement.