桶型基础结构与土壤相互作用的有限元无限元接触元耦合线性分析

A linear coupling analysis of infinite element, finite element and contact element of the interaction between bucket foundation and groundsill

桶型基础是一种新型的海洋基础结构型式。在负压作用下的下沉过程中 ,桶型基础结构与地基产生了相互作用。考虑结构与土壤的相互作用的强度分析为桶型基础的设计提供依据。本文将有限元 -无限元 -接触元相耦合的线性数值分析方法引入桶型基础的结构与土壤之间的相互作用的强度分析 ,采用接触单元考虑结构与土壤之间的错动滑移及拉裂 ;采用无限元更有效地反映地基无限域的远场效应 ;还推导出三节点、七节点、八节点三种新形式的单向无限元坐标映射函数。应用该方法的计算结果与模型试验结果比较 ,取得较好的效果。

Bucket foundation is a new type of foundation structure in ocean engineering. In the diving process under the suction, there is an interaction between the bucket foundation structure and groundsill. The strength analysis considering the interaction between the foundation and groundsill provides a sound basis for the foundation design work. This paper introduces the linear value analysis method that couples the finite element, infinite element and contact element into the strength analysis of the interaction between the foundation and groundsill. This paper adopts the contact element to consider the dislocated slippage and tensile crack, and uses the infinite element to reflect the far field effect of the groundsill infinite region more efficiently. Moreover, this paper puts forward a unidirectional infinite coordinate reflecting the function of three new formations: three, seven and eight nodes. Comparison between the calculating result by this method and the model testing result shows the former one works better.