Seabed instability is an important aspect in the design of different offshore structures. Particularly for a jack-up drilling rig, which is supported by three independents legs, this becomes a crucial issue.

A geotechnical engineering analysis for the installation (preloading) and storm loading of the world’s largest jack-up rig, temporarily installed next to a quay of a Norwegian yard, to be upgraded for production work on the North Sea, is given in this article.