Effects of Monopile Installation on Subsequent Lateral Response in Sand. I: Pile Installation
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 5
Abstract
Monopiles are widely used as the foundation to support offshore wind turbines (OWTs). The response of monopile-supported OWTs is strongly affected by the natural frequency of the system relative to the load spectrum, and in turn, the natural frequency is governed by the initial stiffness of the foundation. Both fatigue limit state (FLS) and serviceability limit state (SLS) design are also influenced by the foundation stiffness. The stiffness of the foundation during operational loading is a function of the initial soil state postinstallation, which is influenced by the installation effect. This is the first part of a pair of companion papers that investigates the effect of different installation methods on the subsequent response of monopiles under lateral loading through extensive numerical analyse. The present paper focuses on the quantification of the effect of pile installation on the soil state in sand for three different initial relative densities. The numerical model is first validated against purpose-designed centrifuge tests. Subsequent analyses demonstrate how the soil state, including the void ratio and stresses, is altered from in-situ conditions during pile installation and is markedly different depending on whether the pile is jacked or impact driven. The results presented here and in the companion paper highlight the need to account for the effects of the installation process on the 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: Oct 20, 2020
Published online: Mar 3, 2021
Published in print: May 1, 2021
Discussion open until: Aug 3, 2021
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