沉入式大圆筒码头结构稳定性的有限元分析方法

摘要

基于有限元软件ABAQUS建立分析沉入式大圆筒码头稳定性的三维弹塑性有限元模型，采用弹性模型模拟大圆筒结构，采用Coulomb-Mohr屈服准则建立土体的本构关系模型，在圆筒与土体之间设置接触面单元模拟圆筒与土体的滑移、张裂和闭合，接触面的切向采用库仑摩擦本构关系模型、法向采用硬接触的方式。通过定义沉入式大圆筒码头稳定性判别准则和加载系数，提出根据加载系数要位移曲线判别结构稳定性的方法。针对某沉入式大圆筒码头工程的结构方案，采用有限元法计算码头结构的稳定性，分析不同土性指标对码头结构稳定性的影响，计算结果表明采用有限元方法分析沉入式大圆筒码头结构的稳定性是可行的。%A 3D elastic-plastic finite element model is built for the stability analysis of the wharf supported on immersed large cylinders by applying ABAQUS finite element software. Elastic model is used to simulate the cylinder; Coulomb-Mohr yield rule is adopted to build the soil constitutive model. Interface element is set to simulate the sliding, tension fissures and closure between cylinder and soil body. Coulomb friction constitutive model is used for tangent direction of the interface, and hard contact is used for normal direction of the interface. By defining the loading coefficient and the stability criterion for the immersed large cylinder wharf,the method of discriminating stability by using loading factor-displacement curve is put forward. As for the structural plan of one immersed large cylinder wharf project, finite element method is used to calculate the wharf stability and analyze the influence of different soil indices on the wharf stability, which proves the feasibility of applying finite element method to the stability analysis of immersed large cylinder wharf.