Effects of Monopile Installation on Subsequent Lateral Response in Sand. II: Lateral Loading
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 5
Abstract
Monopiles under in-service conditions are subjected to lateral forces and resultant bending moments from the offshore environment. The subsequent lateral response following installation is significantly influenced by the initial soil state postinstallation, which is influenced by the pile installation process, as demonstrated in previous numerical studies. To date, there are no technical guidelines established for considering the installation effects on the design of laterally loaded monopiles. This paper is the second of a pair of companion papers that investigate the effect of different installation methods on the subsequent response of monopiles under lateral loading. The paper focuses on the quantification of the effect of pile installation on the initial stiffness and lateral capacity. The numerical model is first validated against purpose-designed centrifuge tests. The analysis confirms that impact driven piles have significantly higher initial stiffness and lateral capacity than jacked piles and wished-in-place piles. The effect of installation methods on the lateral response is also influenced by the initial soil density, driving distance, pile geometry, stress level, and load eccentricity. The study highlights the importance of considering the effects of the installation process on the subsequent lateral pile response.
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Data Availability Statement
The measurement data and model output are available from the corresponding author by request.
Acknowledgments
This work forms part of the activities of the Centre for Offshore Foundation Systems (COFS), which is currently supported as a Centre of Excellence by the Lloyd’s Register Foundation and through the Fugro Chair in Geotechnics and the Shell EMI Chair in Offshore Engineering. Lloyd’s Register Foundation helps to protect life and property by supporting engineering-related education, public engagement, and the application of research. This support is gratefully acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 5 • May 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 29, 2020
Accepted: Dec 22, 2020
Published online: Mar 3, 2021
Published in print: May 1, 2021
Discussion open until: Aug 3, 2021
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