Cyclic Capacity of Monopiles in Sand under Partially Drained Conditions: A Numerical Approach
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 149, Issue 2
Abstract
Cyclic loading of saturated sand under partially drained conditions may lead to accumulated strains, pore pressure buildup, and consequently reduced effective stress, stiffness, and shear strength. This will affect the ultimate limit state capacity of monopile foundations in sand for offshore wind turbines. This paper calculates the performance of large-diameter monopile foundations, which are installed in uniform dense sand, subjected to storm loading using the partially drained cyclic accumulation model (PDCAM). The simultaneous pore pressure accumulation and dissipation is accounted for by fully coupled pore water flow and stress equilibrium (consolidation) finite element analyses. Drainage and cyclic load effects on monopile behavior are studied by comparing the PDCAM simulation results with simulation results using a hardening soil model with small strain stiffness. At the end, a simplified procedure of PDCAM, named PDCAM-S, is proposed, and the results using this approach together with PLAXIS 3D and the NGI-ADP soil model are compared with the PDCAM results.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge the support from the Wave Loads and Soil Support for Extra-Large Monopiles (WAS-XL) project (NFR Grant 268182) and from the REDucing cost of offshore WINd by the integrated structural and geotechnical design 2 (REDWIN 2) project (NFR Grant 296511).
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 149 • Issue 2 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Sep 27, 2021
Accepted: Sep 30, 2022
Published online: Nov 25, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 25, 2023
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