作为新型的海洋基础型式,建立复合加载模式下地基基础的破坏包络面,并依此评价海洋平台基础及地基的稳定性是地基基础设计与施工中的关键问题。但目前对于吸力式桶形基础的破坏包络面形状及其数学形式尚缺乏合理的计算模式和分析方法。基于大型有限元分析软件ABAQUS,采用Swipe试验加载方法,通过比较系统的数值计算与分析,考察了不同荷载组合加载模式下桶形基础破坏包络面形状,并给出了其数学表达式,依次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。
It is one of the key fundamental issues in design and construction of bucket-foundation-supported offshore platforms to evaluate overall stability behavior and failure mechanisms of structures and foundations under combined loading. However, as a new type of foundation, the bearing capacity and practical performance of suction bucket foundation under combined loads remain unaddressed. Based on the Swipe test procedure of loading, implementing a three-dimensional finite element method in the framework of the general-purpose FEM software package ABAQUS, this paper proposes the empirical calculation formulas of failure envelopes of bucket foundation in different loading spaces. The stability of active state of bucket foundation can be estimated based on those equations, which can supply referential resources for design and construction of suction bucket foundation.