CPT Based Design Procedure for Installation Torque Prediction for Screw Piles Installed in Sand

Therar Al-Baghdadi, Craig Davidson, Michael Brown, Jonathan Knappett, Andrew Brennan, Charles E. Augarde, William M. Coombs, Lei Wang, David Richards, Anthony Blake

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

Abstract

Screw piles (helical piles) have been used widely as foundations for onshore projects due to their ability to provide high compressive and tensile resistance as well as reduced noise/vibration during installation. These types of piles have been proposed as a potential innovative foundation for offshore wind turbines in deeper water. In order to adopt the screw pile technique as an offshore foundation, the geometry of the piles would need to be scaled up so they can provide the high capacities required for this application. Such a change in size and geometry will lead to uncertainties in predicting the required torque for installation in different soil types and stress histories. Without the ability to accurately predict installation torque it is difficult to design screw piles for offshore use or develop appropriate installation plant with the required torque capabilities in different soils. This paper presents centrifuge test results of screw piles and CPT tests undertaken in dense sand. The installation torque (T) has been correlated to the cone resistance qc to establish a proposed CPT-based design method to predict the required installation torque for modified screw pile geometries.
Original languageEnglish
Title of host publicationOffshore Site Investigation and Geotechnics: Smarter Solutions for Future Offshore Developments
Subtitle of host publicationProceedings of the 8th International Conference, held 12–14 September 2017 at the Royal Geographical Society, London
PublisherSociety for Underwater Technology
Pages346-353
Volume1-2
ISBN (Print)9780906940570 (hbk) Volume 1, 9780906940587 (hbk) Volume 2
Publication statusPublished - 12 Sep 2017
Event8th Offshore Site Investigation and Geotechnics International Conference: ‘Smarter Solutions for Future Offshore Developments’ - Royal Geographical Society, London, United Kingdom
Duration: 12 Sep 201714 Sep 2017
http://www.sutconnects.com/ (Link to conference website)

Conference

Conference8th Offshore Site Investigation and Geotechnics International Conference
CountryUnited Kingdom
CityLondon
Period12/09/1714/09/17
Internet address

Keywords

  • Screw piles
  • CPT test
  • Sand
  • Torque

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