倾斜荷载作用下桶形基础承载力特性研究

针对吸力式桶形基础结构，借助大型通用有限元软件ABAQUS平台，建立了均质软黏土地基上倾斜荷载作用的三维弹塑性有限元计算模型。通过系统地计算分析，得到了单个倾斜荷载分量作用下桶形基础的承载力特性及其破坏机制。进一步研究了水平倾斜荷载与竖向倾斜荷载共同作用下的桶形基础承载性能，得到了该倾斜荷载加载方式作用下桶形基础在V-H平面内的破坏包络面，依此建立了倾斜荷载与偏心距e之间的三维破坏包络曲面。计算结果表明，偏心距e对竖向倾斜承载力的影响相对水平倾斜承载力较大；桶形基础承载性能随着偏心距e的增大而减小。

Studies of bearing capacity of bucket foundation against inclined loading

A series of studies of suction bucket foundation in normally consolidated clay are carried out to investigate the bearing capacity of bucket foundation under inclined loads. A finite element method for assessing bearing capacity of offshore foundations or structures under eccentric and inclined loads is numerically implemented in the framework of the general-purpose FEM software package ABAQUS. In the method, a number of three-dimensional elastoplastic FEM computations for bearing capacity and failure mechanisms are conducted. The numerical results computed by the proposed method indicate that the effect of bearing capacity against vertical inclined loads is more significant than that against horizontal inclined loads. Moreover, failure envelopes in V-H loading space are reducing with the increase of eccentric distance and further investigations of a simple unique expression of failure envelopes. Finally, the three-dimensional failure envelope is formatted in different V-H corresponding to varied eccentricity. Those results by computed will provide referential resources for design and construction.