ABSTRACT

As the interpretation of site investigation data and the derivation of a design shear strength profile for use in bearing capacity analysis have traditionally relied heavily on experience, there is potential risk associated with extrapolation of such experience from one soil type to another. Indeed, the subjectivity of the choice of a design shear strength profile was highlighted in an exercise within the InSafeJIP (Osborne et al. 2008, 2009a). The site investigation results of two jack-up locations were provided to a number of people. Their interpretation varied widely, as did the suggested design shear strength profiles. This showed the need for a more objective evaluation of each of the soil strength characterisation methods used as well as the process of deriving shear strength profiles for use in load-penetration predictions for jack-up rigs.