软基循环弱化效应时箱筒型基础防波堤稳定性分析  

Stability Analysis of Cylindrical Foundation Breakwater by Considering Cyclic Weakening Effect of Soft Base

作　　者：李元音[1] 肖忠[2] 王元战[2] 李斌[1] 王会斌[2] 张哲源[2] 

机构地区：[1]中交第一航务工程勘察设计院有限公司,天津300222 [2]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《港工技术》2015年第1期26-29,54,共5页Port Engineering Technology

基　　金：国家自然科学基金项目(51109157);天津市应用基础与前沿技术研究计划项目(12JCQNJC04900);高等学校博士学科点专项科研基金项目(20110032120049);大连理工大学海岸和近海工程国家重点实验室开放基金项目(LP1106)

摘　　要：将基于D-P屈服准则的循环强度模型和由动三轴实验数据整理出的天津港软粘土循环强度曲线相结合,基于三维弹塑性有限元模型分析了循环波浪力引起的软基弱化作用对箱筒型基础防波堤结构稳定性的影响。由有限元计算结果可得出在考虑软基弱化作用时,天津港防波堤延伸工程中的箱筒型基础防波堤的稳定性下降约10%,且不对软土地基进行加固,结构稳定性仍满足。The cyclic strength model based on D-P yield criterion was combined with the cyclic strength curve of Tianjin port soft clay deduced from the dynamic tri-axial testing data, which was adopted to built a 3D elastic-plastic finite element model for analyzing soft base weakening impact on the stability of cylindrical foundation breakwater due to cyclic wave force. The finite element calculation results showed that the stability factor of cylindrical foundation breakwater was decreased by 10 % if soft base weakening effect was taken into consideration in Tianjin port breakwater extending project, however, the structure could still meet the stability requirement even though no soft base reinforcement was done.

关 键 词：箱筒型基础防波堤 稳定性 循环弱化效应 循环强度 有限元法 

分 类 号：U656.22[交通运输工程—港口、海岸及近海工程] TU471.8[交通运输工程—船舶与海洋工程]