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中文摘要：
桶形基础结构是一种适宜于滩海软黏土地基上的新型海洋基础形式。研究复合加载模式下桶形基础的承载力特性，并进而依此评价海洋平台基础及地基的稳定性是桶形基础设计与施工中的关键问题。针对软黏土地基上桶形基础结构，利用大型通用有限元分析软件ABAQUS，采用基于Mohr-oulomb屈服准则的理想弹塑性本构模型，对复合加载模式下桶形基础的承载特性进行了三维弹塑性数值分析。在V-H、V-M、V-M-H空间内建立了复合加载模式下桶形基础极限承载力破坏包络图，推导了破坏包络面的经验计算公式，由此可根据实际的复合加载状态与数值计算所得的破坏包络曲面之间的相对关系，评判实际荷载作用下桶形基础的工作状态，为工程设计提供参考依据。
英文摘要：
As a new type of offshore foundation, the suction bucket foundation has been widely applied to soft ground in beach-shallow water. The response of the suction bucket foundation subjected to combined loads is therefore of significant importance for the design and construction of offshore foundation. Based on the Mohr-Coulomb yield criterion, a perfect elasto-plastic finite element method for numerical assessment of bearing capacity of bucket foundation under the combined loads was developed by virtue of the general-purpose FEM software ABAQUS. The failure envelopes in different loading spaces were generated. Then, the empirical calculation formulas were given according to the failure envelopes. Based on the relationship between the actual combined loading and the computed failure envelopes, the active state of bucket foundation could be evaluated, and it would be helpful in engineering practices.
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