软基桶形基础承载性能三维弹塑性有限元仿真

Simulation of bearing capacity of bucket foundation on soft foundation by three-dimensional elasto-plastic FEM

针对用于海洋平台的桶形基础在单调加载或复合加载作用下的承载性能,基于大型通用有限元分析软件ABAQUS,建立了桶形基础的三维弹塑性计算模型,通过比较系统的数值计算与分析,探讨了不同加载模式下软黏土土性参数和桶体长径比对桶形基础承载性能的影响效果,进而建立复合加载模式下桶形基础的破坏包络面,并依此评价海洋平台基础及地基的稳定性.结果表明:不排水抗剪强度及桶体的长径比是影响桶形基础承载性能的主要因素,而软黏土的重度是影响桶形基础承载性能影响的次要因素.

As a new type of foundation, the suction bucket foundation is widely employed in offshore engineering. To evaluate the bearing capacity of bucket foundation under monotonic or combined loading, presented in this paper are the three-dimensional nonlinear numerical analyses of the bearing capacity of bucket foundation in soft clay. The general-purpose finite element software ABAQUS is utilized and numerical computations are conducted Through the numerical analyses, sensitivity analysis of the effect of soil parameters on the bearing capacity for monotonic and combined loading of bucket foundation is reviewed. It is shown that the shear strength and aspect ratio of the bucket foundation have the substantial effect on the bearing capacity of bucket foundation. However, the effect of the bulk weight of soft soil on bearing capacity of bucket foundation is not considerable relatively.