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Title: Causes of post-installation penetration of jack-up spudcan foundations in clays
Authors: Li Y.P.
Yang Y. 
Yi J.T.
Ho J.H.
Shi J.Y.
Goh S.H. 
Lee F.H. 
Keywords: Article
finite element analysis
physical parameters
spudcan settlement
building material
Gulf of Mexico
fossil fuel
Construction Materials
Finite Element Analysis
Fossil Fuels
Gulf of Mexico
Mechanical Phenomena
Issue Date: 2018
Publisher: Public Library of Science
Citation: Li Y.P., Yang Y., Yi J.T., Ho J.H., Shi J.Y., Goh S.H., Lee F.H. (2018). Causes of post-installation penetration of jack-up spudcan foundations in clays. PLoS ONE 13 (11) : e0206626. ScholarBank@NUS Repository.
Abstract: This paper examines possible causes of additional spudcan settlement after preloading using both centrifuge model tests and small strain finite element analysis, in which spudcan settlement due to cavity collapse, consolidation settlement and settlement due to cyclic loading are incorporated. Back-analyses of seven jack-up rigs in the Gulf of Mexico show that even complete cavity collapse could only explain part of the measured additional settlements in the majority of the cases. Small strain finite element analyses also show that spudcan consolidation settlement is likely to account for even less of the additional settlement than cavity collapse in the sites considered. On the other hand, centrifuge model tests show that large amplitude cyclic rocking has a very significant effect on spudcan settlement, even if half of the preload has been removed. However, this effect cannot be explained by the exceedance of the yield envelope since the loading combination had not exceeded the yield envelope. One possible explanation is the stiffness and strength degradation of the soil under cyclic loading. In view of this, a conservative approach is recommended in instances where large amplitude cyclic rocking, such as that arising from storm loading, is expected shortly after preloading. The presence of lattice legs is found to reduce the spudcan settlement during large amplitude cyclic rocking. © 2018 Li et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Source Title: PLoS ONE
ISSN: 19326203
DOI: 10.1371/journal.pone.0206626
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