Journal article

Breakout force required for jack-up spudcan extraction from sand-over-clay seabeds

P Hu, M Cassidy, F Sahdi, S Stanier

Soils and Foundations | Elsevier | Published : 2020


Spudcan retrieval from clay soils remains a major concern offshore as the extraction force required to overcome suction and soil resistance often exceeds the pulling capacity available on the mobile jack-up, causing extensive delays. Although methods to calculate extraction resistance have been recently suggested for seabeds of pure clay, to date there is no guidance available for the commonly encountered sand-over-clays. Based on failure mechanisms observed in half-spudcan visualisation tests, and calibrated against an extensive geotechnical centrifuge database of precisely measured extractions, this paper presents a method for calculating the force required to extract the spudcan foundatio..

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University of Melbourne Researchers


Awarded by Australian Research Council

Funding Acknowledgements

This work forms part of the activities of the Centre for Offshore Foundation Systems (COFS) at the University of Western Australia, Australia, which is supported by the Lloyd's Register Foundation. Lloyd's Register Foundation invests in science, engineering, and technology for public benefit, worldwide. This project received additional support from the ARC Laureate Fellowship FL130100059 of the second author. The last author was supported by ARC DECRA Fellowship DE170100119.