土工基础

›› 2019, Vol. 33 ›› Issue (2): 232-235.

• 工程实录 • 上一篇    

“铁板砂-黏土”中桩靴贯入峰值阻力的离心试验

荆少东1，陈 霄2，孙永福3，张民生2，寇海磊2，王 栋2   

  1. （1.中石化石油工程设计有限公司，山东东营  257026；2.中国海洋大学，山东青岛 266100；
    3.自然资源部第一海洋研究所，山东青岛 266061）
  • 收稿日期:2019-03-20 修回日期:2019-03-24 出版日期:2019-04-20 发布日期:2019-04-22
  • 通讯作者: 王 栋（1975-），男，教授，研究方向为海洋岩土工程。
  • 作者简介:荆少东（1972-），男，教授级高级工程师，研究方向为工程勘察和岩土工程设计。
  • 基金资助:

    国家自然科学基金项目（U1806230，51809247）；山东省自然科学基金（ZR2018BEE043）

Centrifuge Tests for Peak Penetration Resistance of Spudcan Footings in Hard Crust Layer Overlying Clay

JING Shaodong1, CHEN Xiao2, SUN Yongfu3, ZHANG Minsheng2, KOU Hailei2, WANG Dong2   

  1. (1.Sinopec Petroleum Engineering Corporation, Dongying 257026, China; 
    2.Ocean University of China, Qingdao 266100, China;
    3.The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China)
  • Received:2019-03-20 Revised:2019-03-24 Online:2019-04-20 Published:2019-04-22

摘要： 东营埕岛海域广泛分布“铁板砂-黏土”地层，自升式平台的桩靴基础在这种复杂土层中安装时易发生穿刺失稳。为研究此类问题，进行了离心机模型试验，量测“铁板砂-黏土”中桩靴贯入阻力随深度的变化。针对铁板砂层中峰值阻力的幅值及出现深度，讨论了ISO规范和两种代表性预测方法的适用性，发现可以将铁板砂层视为不排水条件下的强黏土层，采用针对“强黏土-弱黏土”地层的预测方法估计峰值贯入阻力。

关键词: 桩靴, 粉质砂土, 穿刺, 不排水强度, 排水条件

Abstract: The “hard crust layerclay” layered soil is spread widely in shallow waters near Chengdao, Dongying. When they are installed in such stratigraphy, the spudcan footings of jackup rigs are vulnerable to punchthrough failure. A number of centrifuge tests were conducted to explore the penetration resistance profile of spudcans in hard crust layer overlying clay. The approaches recommended in the ISO guidelines and other two representative approaches are compared, in terms of the magnitude of peak resistance and its corresponding depth. It is found that hard silty sand layer can be regarded as a strong clay layer under undrained conditions, then the peak resistance may be estimated through previous approaches for “stiffoversoft” clays.

Key words: spudcan, silty sand, punchthrough, undrained strength, drainage conditions