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Keywords = dense sand overlying non-uniform clay

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12 pages, 2382 KB  
Article
On Cubic Spudcan Deep Penetration in Dense Sand Overlying Non-Uniform Clay
by Jun Zhao, Yang Zhang and Luyu Liu
J. Mar. Sci. Eng. 2022, 10(11), 1607; https://doi.org/10.3390/jmse10111607 - 31 Oct 2022
Cited by 4 | Viewed by 1962
Abstract
Installing spudcans for jack-up rigs in a layered seabed with an interbedded strong-over-soft layer is challenging in the offshore industry due to possible punch-through failure. The methods currently used to predict punch-through failure mainly focus on generic spudcans, usually ignoring the geometric features [...] Read more.
Installing spudcans for jack-up rigs in a layered seabed with an interbedded strong-over-soft layer is challenging in the offshore industry due to possible punch-through failure. The methods currently used to predict punch-through failure mainly focus on generic spudcans, usually ignoring the geometric features of the spudcan. The aim of this study is to determine whether the punch-through potential of a generic spudcan is applicable to a cubic spudcan of a BH12# jack-up rig installed in dense sand overlying non-uniform clay. We conducted a series of large deformation finite element (LDFE) analyses on dense sand overlying non-uniform clay using a generic spudcan and a cubic spudcan. The thickness of the sand layer was also varied to cover a range of practical interest. The special cubic spudcan was found to be less likely to induce punch-through failure on sand-over-clay sediments compared with the corresponding generic spudcan. Herein, we propose a method to predict the degree of post-peak bearing reduction, which is a key measure of the severity of punch-through failure. Full article
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