Abstract
The footprints that remain on the seabed after offshore jack-up platforms completed operations and moved out provide a significant risk for any future jack-up installation at that site. Detrimental horizontal and/or rotational loads will be induced on the base cone of the jack-up platform leg (spudcan) in the preloading process where only vertical loads are normally expected. However, there are no specific guidelines on design of spudcan re-installation very close to or partially overlapping existing footprints. This paper presents a rational design approach for assessing spudcan–footprint interaction and the failure process of foundation in a single layer based on nonlinear finite element method. The relationship between the distance between the spudcan and the footprint and the horizontal sliding force has been obtained. Comparisons of simulation and experimental results show that the model in this paper can deal well with the combined problems of sliding friction contact, fluid–solid coupling, and convergence difficulty. The analytical results may be useful to jack-up installation workovers close to existing footprints.
Highlights
With an increase in frequency of operations, the situation that installation of jack-up platforms on sites which contains old Edited by Yan-Hua Sun footprints is becoming more common and inevitable
This paper presents a rational design approach for assessing spudcan–footprint interaction and the failure process of foundation in a single layer based on nonlinear finite element method
There are approximately 80 new single footprint points added to the existing datasets every year
Summary
With an increase in frequency of operations, the situation that installation of jack-up platforms on sites which contains old. Teh et al (2006) reported a set of test results investigating the effects of sloping seabed (30° inclined to the horizontal) and footprint on loads developed in jack-up legs. They found that the effect of the footprint is much greater than that of the seabed slope. This paper takes various factors including failure process of foundation, nonlinearity, sliding friction contact, and fluid–solid coupling into account It discusses the finite element model of spudcan–footprint interaction in spudcan re-installation near an existing footprint as well as handling relative parameters. The finite element model was validated by comparing the simulation result with experimental results
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