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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

Influence of scour depth and type on p–y curves for monopiles in sand under monotonic lateral loading in a geotechnical centrifuge Thumbnail


Authors

Georgios Chortis

Amin Askarinejad

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 Mar 29, 2024
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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