软基循环弱化效应时箱筒型基础防波堤稳定性分析

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.