筒型基础防波堤土压力性状的有限元分析  

Finite element analysis for earth pressure on bucket foundation of breakwater

作　　者：王元战[1] 肖忠[1] 李元音[2] 谢善文[2] 

机构地区：[1]天津大学天津市港口与海洋工程重点实验室,天津300072 [2]中交第一航务工程勘察设计院有限公司,天津300222

出　　处：《岩土工程学报》2009年第4期622-627,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50779043);西部交通建设科技项目(200632800003-06);高等学校博士点基金项目(20050056036)

摘　　要：筒型基础防波堤是一种新型港口与海岸工程结构,依靠沉入地基土层中的筒型基础维持结构稳定,作用在筒型基础上的土压力是结构稳定性验算的核心内容。结合某实际工程,建立了筒型基础防波堤三维弹塑性有限元模型,分析了不同波浪力加载值下作用在筒型基础上土压力的大小及竖向和环向分布规律,并将有限元计算的极限状态下的土压力与Rankine主动、被动土压力和静止土压力进行了比较分析。根据筒型基础的位移模式,将土压力分为主动、被动和静止3个区域,建议了不同区域土压力的简化计算方法,为筒型基础结构稳定性验算提供了基本依据。The bucket foundation of breakwater is a new type of structure applied in port and coastal engineering, the stability of which is sustained by the bucket foundation penetrated in soft soil. The calculation of earth pressure on the bucket foundation is the key content of examination for structure stability. A 3D elasto-plastic finite element model is established to analyze the magnitude, vertical and circumferential distribution of earth pressure on bucket foundation under different wave load according to a practical project. Besides, the earth pressures calculated by the finite element method in the limit state are compared with the earth pressure at rest, active and passive earth pressures. According to the displacement mode of bucket foundation, the distribution areas of earth pressure are divided into three regions, i.e., active, passive and static regions. The simplified calculation methods of earth pressures for different regions are suggested. The results can be used to check computations of stability for the bucket foundation of breakwaters.

关 键 词：筒型基础 土压力 有限元模型 简化计算方法 

分 类 号：TU432[建筑科学—岩土工程]