土工基础

›› 2017, Vol. 31 ›› Issue (1): 63-67.

• 工程实录 • 上一篇    下一篇

黏土地基中桶形基础抗拔承载特性有限元分析

霍知亮1，闫澍旺2   

  1. （1.天津市市政工程设计研究院，天津 300051；2.天津大学水利工程仿真与安全国家重点实验室，天津 300072）
  • 收稿日期:2016-02-18 修回日期:2016-02-29 出版日期:2017-02-20 发布日期:2017-02-24
  • 作者简介:霍知亮（1987-），男，工程师，博士，研究方向为海洋土力学及岩土工程勘察方面。

Finite Element Analysis of Uplift Behavior of the Suction Caisson in Soft Clay

HUO Zhiliang1, YAN Shuwang2   

  1. (1.Tianjin Municipal Engineering Design & Research Institute, Tianjin 300051;
    2.State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072)
  • Received:2016-02-18 Revised:2016-02-29 Online:2017-02-20 Published:2017-02-24

摘要： 黏土地基中桶形基础在抗拔承载特性方面，由于桶裙内土体（土塞）的受力状态，使得它与其它海洋基础形式有明显的区别。桶形基础可能产生局部剪切破坏、底部张力破坏以及反向承载力破坏三种不同的抗拔失效形式，其中确定反向承载力破坏时的极限承载能力最为关键。通过有限元分析，研究桶形基础反向承载力破坏的机理，及组成抗拔承载力各部分抗力的变化情况，并利用计算结果与理论公式进行对比，提出适宜的抗拔承载力计算公式，为桶形基础抗拔承载力的设计提供依据和有益参考。

关键词: 桶形基础, 抗拔, 反向承载力破坏, 有限元分析

Abstract: Due to the soil inside the suction caisson, the suction caisson and other marine foundations demonstrate a significant difference in the uplift characteristics. For suction caissons subjected to primarily vertical tensile loads, there exist three different failure modes, “slide failure”, “bottom resistance failure” and “reversed bearing capacity failure”. Different drainage conditions at the bottom of the caisson control the applicable failure mode. In this paper, efforts are made to investigate the suction caissons as a type of foundation for the underwater structures. Numerical analyses are performed to simulate the working mechanism and evaluate the resistance of the reversed bearing capacity failure mode. The most appropriate design method was also proposed through experiments and theoretic analysis.

Key words: Suction Caisson, Uplift, Reversed Bearing Capacity Failure, Finite Element Analysis