Back-calculation of measured leg penetrations of tubular legged jack-ups during preloading
Raymackers, S. (2013). Back-calculation of measured leg penetrations of tubular legged jack-ups during preloading, in: Cui, Y.-J. et al. (Ed.) Proceedings of the 5th International Young Geotechnical Engineers' Conference. pp. 213-217. dx.doi.org/10.3233/978-1-61499-297-4-213
In: Cui, Y.-J. et al. (Ed.) (2013). Proceedings of the 5th International Young Geotechnical Engineers' Conference. IOS Press: [s.l.]. ISBN 978-1-61499-296-7. , meer
For offshore wind applications, four-legged jack-ups with tubular legs are often operated without spudcans. In cohesive soils the leg penetrations during preloading can exceed 2.5 times the diameter of the pile. The behaviour is therefore typically that of a semi-deep foundation. Because industry standards were originally intended for truss leg jack-ups with spudcans, guidance is limited for the estimation of leg penetrations of tubular leg jack-ups without spudcans. In this paper measured leg penetrations at 2 sites across Europe are back-calculated using industry standard methods (ISO 19905-1: 2012) and compared with CPT results. Based on a literature study and pile bearing capacity formulae, a method to predict semi-deep leg penetrations of tubular leg jack-ups directly from CPT's, is proposed. The method will be calibrated based on the presented measured leg penetrations.
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