吸力式桶形基础多桶组合结构承载力特性研究

Studies on Bearing Capacity of Composite Multi-bucket Structure of Suctional Bucket Foundation

海洋采油平台结构中一般采用多桶组合基础型式,然而迄今对多桶组合结构尚缺乏理论分析和实验研究。本文针对我国第一座吸力式桶形基础采油平台CB20B,基于单桶基础在复合加载模式下的承载力特性,建立了双桶、四桶组合基础的三维有限元数值计算模型,探讨了对称多桶基础结构与单桶基础结构的承载力特性之间的相互关系,阐述了不同桶间距的多桶组合结构地基破坏机制,为工程设计提供参考依据。

Multi-bucket foundation is generally adopted for actual offshore platforms;however,its performance has been short of theoretical analysis and experimental research.To evaluate the bearing capacity of a multi-bucket foundation on soft soils,the first offshore platform CB20B composed of suctional bucket foundation in China is taken for an example for the development of a finite element procedure based on the bearing capacity of single bucket foundation.And the finite element procedure is extended to set up a three-dimensional finite element model for double and four-bucket foundations.The relationship of bearing capacity between a multi-bucket foundation and a single-bucket foundation is explored to formulate the failure mechanisms of composite multi-bucket foundation and the soil underneath,which will be helpful in engineering practice.