Numerical Study of Footprint Generation and Reinstallation of Jack-Up Footings
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 10
Abstract
Jack-up leg installation, extraction, and reinstallation near extraction-induced footprints are simulated using the coupled Eulerian-Lagrangian method with a strain-softening soil model. A typical footprint considering soil remolding is summarized based on 29 installation and extraction simulations. The reinstallation behavior of flat-base footings, spudcans, and skirted footings near extraction-induced and idealized conical or cylindrical footprints is compared. The horizontal force and bending moment induced by the footprint are explained in terms of predicted soil flow mechanisms and reaction loads acting on various footing surfaces. Considering soil remolding in a footprint, the results indicate that the soil on the near side of the footprint collapses earlier than that on the far side. The back flow soil on the near side of the footprint leads to obvious negative loading on the footing leg. Two peaks in the profile are observed. The first one is due to the footing touching the uneven seabed and the second is due to asynchronous collapse of the near-side and far-side walls of the footprint. The effects of the footing type and offset distance on the reinstallation behavior are discussed. The maximum values of and in both the positive and negative ranges during reinstallation are presented. Among the investigated footing types, the skirted footing has the greatest potential for mitigating the footing–footprint interaction problem because it provides the largest vertical resistance but induces the smallest horizontal forces and bending moments.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This study was supported by the Chinese National Natural Science Foundations (51890915, 51679038, 51639002). The discussions with Dr. Youngho Kim, Dr. Shazzad Hossain, and Prof. Yuxia Hu at the University of Western Australia are sincerely acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 10 • October 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jul 31, 2019
Accepted: Jun 3, 2021
Published online: Aug 11, 2021
Published in print: Oct 1, 2021
Discussion open until: Jan 11, 2022
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