Print Email Facebook Twitter Influence of scour depth and type on p–y curves for monopiles in sand under monotonic lateral loading in a geotechnical centrifuge Title Influence of scour depth and type on p–y curves for monopiles in sand under monotonic lateral loading in a geotechnical centrifuge Author Chortis, G. (Student TU Delft) Askarinejad, A. (TU Delft Geo-engineering) Prendergast, L.J. (TU Delft Geo-engineering; University of Nottingham) Li, Q. (TU Delft Geo-engineering) Gavin, Kenneth (TU Delft Geo-engineering) Date 2020 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. Subject Centrifuge modellingOffshore monopilesp-y curvesScour To reference this document use: http://resolver.tudelft.nl/uuid:85a02f2f-6035-4fdb-ac30-0809c6abf92b DOI https://doi.org/10.1016/j.oceaneng.2019.106838 Embargo date 2020-07-17 ISSN 0029-8018 Source Ocean Engineering, 197 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2020 G. Chortis, A. Askarinejad, L.J. Prendergast, Q. Li, Kenneth Gavin Files PDF 1_s2.0_S0029801819309357_main.pdf 2.86 MB Close viewer /islandora/object/uuid:85a02f2f-6035-4fdb-ac30-0809c6abf92b/datastream/OBJ/view