Centrifuge Model Study on the Effect of Lattice Leg and Sleeve on the Postconsolidation Bearing Capacity of Spudcan Foundation
Centrifuge Model Study on the Effect of Lattice Leg and Sleeve on the Postconsolidation Bearing Capacity of Spudcan Foundation
复制标题
格构腿和套筒对桩基地基后固结承载力影响的离心模型研究
DOI：
10.1115/1.4039372
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Yi JT
中科院分区：
文献类型：
--
作者：
Li Yu Ping;Yi Jiang Tao;Lee Fook Hou;Yi JT
迄今为止，对自升式平台筒式基础固结后承载力提高的研究多采用离心模型试验和数值分析，而忽略了实际的自升式平台格构式桩腿。本文采用离心模型试验，模拟了正常固结粘土中固结后的钢筋混凝土柱的“贯入-卸载-固结-再贯入”全过程，研究了典型的格构柱和套筒对固结后钢筋混凝土柱承载力的影响。试验结果表明，与无腿筒相比，格构腿和套筒对筒体两侧承载力的影响较大。第一，它增加了瞬态承载力在初始的dedcan渗透;第二，较少的postconsolidation承载力的改善是由腿的存在。前者对自升式平台桩腿贯入度的预测具有重要意义，而后者对实际海上自升式平台在预加载和运行期间的套管穿通风险具有较低的意义。
Up to now, the postconsolidation bearing capacity enhancement of jack-up spudcan foundation has been explored using centrifuge model tests and numerical analyses, which however ignored the realistic jack-up lattice leg. This paper investigates both typical lattice leg and sleeve effects on the postconsolidation spudcan bearing capacity using centrifuge model tests, by replicating the entire process of spudcan in normally consolidated clay: “penetration–unloading–consolidation–repenetration.” The experimental results show that the lattice leg and sleeve affect the spudcan bearing capacity in two sides compared with spudcan without leg. First, it increases the transient bearing capacity during initial spudcan penetration; second, less postconsolidation bearing capacity improvement is yielded by the presence of the leg. The former effect is of importance on the prediction of jack-up leg penetration, and the latter effect would suggest a lower risk of spudcan punch-through for realistic offshore jack-up rig during preloading and operation period.