黎之奇,徐文祥.桩靴在黏土中不连续加载穿刺现象的实验研究[J].湖南大学学报:自然科学版,2019,(9):108~114
桩靴在黏土中不连续加载穿刺现象的实验研究
Experimental Study on Punch-through Phenomenon of Spud-can in Clay under Discontinuous Loading
  
DOI:
中文关键词:  海洋平台  黏土  桩靴  穿刺  冲桩
英文关键词:marine platform  clay  spud-can  punch-through  waiter jetting
基金项目:
作者单位
黎之奇,徐文祥 (湖南大学 土木工程学院湖南 长沙 410082) 
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中文摘要:
      为解决自升式平台在南海等软黏土区域作业时出现的穿刺问题,对平台桩靴在黏土中加载时出现的穿刺现象进行实验验证,并对穿刺机理和解决方案进行探索.以某大桩靴自升式平台的实际加载过程为原型,设计一套不连续加载的单桩模型插桩实验装置,通过力加载的方式模拟自升式平台预压载过程,分析插桩时的冲桩处理对穿刺风险的消除效果.研究结果表明:黏土层中不连续加载能够形成穿刺现象,并且减小加载速率在一定程度上可以降低穿刺风险;通过在加载过程中进行冲桩作业,能有效减少穿刺的发生.因此在实际工程中可通过选择合适的加载速率,并在加载过程中进行冲桩操作来降低穿刺风险,保证作业 安全.
英文摘要:
      In order to solve the punch-through problem of the Jack-up platform in the soft clay area such as the South China Sea, the punch-through phenomenon of the Jack-up platform when penetrating in clay was verified by experiment, and the mechanism and solution for the punch-through were explored. In this paper, an experimental set for single leg penetration test under discontinuous loading was designed to simulate the preloading process of a real Jack-up platform with large spud-can, and a series experiments were performed to investigate the effect of the water jetting process for eliminating the risk of punch-through. The results show that the punch-through can occur in the clay layer under discontinuous loading, and the risk of the punch-through can be mitigated by reducing the loading rate or performing water jetting process. Thus, the present investigation is beneficial for safety operation of the jack-up platform in practice.
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