Georgios Chortis
Influence of scour depth and type on p–y curves for monopiles in sand under monotonic lateral loading in a geotechnical centrifuge
Chortis, Georgios; Askarinejad, Amin; Prendergast, Luke; Li, Qiang; Gavin, Ken
Authors
Amin Askarinejad
LUKE PRENDERGAST LUKE.PRENDERGAST@NOTTINGHAM.AC.UK
Associate Professor
Qiang Li
Ken Gavin
Abstract
The influence of scour on the lateral response of monopile foundations for offshore wind turbines is investigated in this paper. Application of lateral load-displacement (p-y) curves to predict the lateral pile behaviour is subject to uncertainty as many of the presently used design approaches have been derived for long, slender piles. These piles, with typical length/diameter ratios (L/D) of greater than 10 behave differently compared to rigid monopiles, with L/D typically less than 6. In this paper, centrifuge tests are conducted on a monopile model under various scour scenarios and p-y curves are derived from strain gauges embedded along the model pile wall. Global scour and two different shapes for local scour holes are studied. Using the piecewise polynomial method for extraction of p-y curves from sparsely distributed strain measurements, it is recommended to use a 4th order polynomial for the moment profile to extract soil reaction and a 7th order polynomial for the moment profile to calculate pile deflection. Results indicate that the pile behaviour is significantly influenced by the nature (size, shape) of the scour holes affecting the pile–soil system and suggest that the p-y curves should be appropriately modified to account for this behaviour.
Citation
Chortis, G., Askarinejad, A., Prendergast, L., Li, Q., & Gavin, K. (2020). Influence of scour depth and type on p–y curves for monopiles in sand under monotonic lateral loading in a geotechnical centrifuge. Ocean Engineering, 197, Article 106838. https://doi.org/10.1016/j.oceaneng.2019.106838
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 7, 2019 |
Online Publication Date | Jan 17, 2020 |
Publication Date | Feb 1, 2020 |
Deposit Date | Jan 22, 2020 |
Publicly Available Date | Jan 18, 2021 |
Journal | Ocean Engineering |
Print ISSN | 0029-8018 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 197 |
Article Number | 106838 |
DOI | https://doi.org/10.1016/j.oceaneng.2019.106838 |
Keywords | Offshore monopiles; p-y curves; Centrifuge modelling; Scour |
Public URL | https://nottingham-repository.worktribe.com/output/3781921 |
Publisher URL | https://www.sciencedirect.com/science/article/pii/S0029801819309357?via%3Dihub |
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