半圆型防波堤地基承载特性的有限元数值分析

半圆型防波堤是适用于软土地基的轻型重力式结构,地基承载特性是工程应用中需解决的重要问题。以大型通用有限元软件ABAQUS作为分析平台,建立了波浪荷载作用下半圆堤结构的弹塑性有限元分析模型。结合工程实例,分别参照地基极限承载力、结构允许变位判别标准对半圆堤的地基承载特性以及影响因素进行了有限元数值分析,并与汉森公式计算结果进行比较。结果表明:基于允许变位判别标准下的地基承载力分析结果相对安全,地基极限承载力计算的有限元结果与理论公式结果基本吻合,证实了汉森公式对半圆堤结构的适用性。进一步利用有限元方法分析了地基土强度、基础宽度、加固深度等因素对地基承载力的影响。

Finite element analysis on bearing characteristics of foundation abort semi-circular breakwater

Semi-circular breakwater is light gravity structure and suitable for soft soil foundation,and its bearing capacity of foundation is an important problem to be solved in engineering application.With the general finite element software ABAQUS,an elastic-plastic finite element model about semi-circular breakwater structure under wave load was established.Combining with an engineering example,the bearing characteristics of foundation and influence factors were analyzed by finite element method according to ultimate bearing capacity and allowable displacement of structure,and the results were compared with the Hansen formula.The results confirm the feasibility of Hansen formula on semi-circular breakwater,and bearing capacity of foundation according to the allowable displacement of structure is relatively safe.The strength of the foundation soil,preloading,width and depth of bedding and other factors on bearing capacity of foundation were further analyzed using the FEM.