Conference Proceedings

A comparative assessment of the use of spudcans and caissons as the foundations of jack-up structures

G Vlahos, MJ Cassidy, B Knowles

PROCEEDINGS OF THE 24TH INTERNATIONAL CONFERENCE ON OFFSHORE MECHANICS AND ARCTIC ENGINEERING, VOL 2 | AMER SOC MECHANICAL ENGINEERS | Published : 2005

Abstract

More than ever before, operators are advancing mobile jack-up units into deeper waters and harsher environments. Constraining their use is the capacity of the shallow foundations (typically inverted conical spudcans) to withstand the larger wave, wind and current loads of these environments. The use of foundation skirts (or caissons) is often touted as an alternative, though today only a small percentage of jack-up units use caisson foundations. One restraining feature is limited understanding of their behaviour when compared to conventional spudcan. This paper addresses this by comparing the results of push-over experiments of a three-legged jack-up with similarly sized caisson and spudcan ..

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University of Melbourne Researchers