The effect of scour on monopile lateral behaviour

S. M. Bayton, J. A. Black

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


A series of centrifuge experiments examining the effect of scour hole formation on the lateral ultimate limit state (ULS) behaviour of monopiles is presented. Model foundation tests were performed at 100 gravities (100g) of a prototype pile 5 m in diameter with a pre-scour hole embedment of L/D = 5. The testing schedule saw four separate scour cases - 0.5D, 1.0D and 1.5D local scour (a conical formation around the monopile) and 1.0D global scour (a complete loss of embedment). Observations reveal a significant reduction in lateral stiffness and ultimate capacity with an increase in scour depth. In addition design codes are proven to be conservative in their recommendations for dealing with scour. Local p - y curves along the depth of the monopile are presented and exemplify the effects of overburden stresses from soil outside of the scour formation; it would appear that at depth, the effects of scour on soil strength become negligible.

Original languageEnglish
Title of host publicationProceedings of the XVII ECSMGE-2019: geotechnical engineering foundation of the future
EditorsHaraldur Sigursteinsson, Sigurður Erlingsson, Bjarni Bessason
PublisherIcelandic Geotechnical Society
ISBN (Electronic)9789935943613
Publication statusPublished - 01 Sept 2019
Externally publishedYes
Event17th European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2019 - Reykjavik, Iceland
Duration: 01 Sept 201906 Sept 2019


Conference17th European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2019


  • Centrifuge
  • Monopile
  • Offshore
  • P - y curves
  • Scour

ASJC Scopus subject areas

  • Soil Science
  • Geotechnical Engineering and Engineering Geology


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