Lateral Performance of Helical Piles as Foundations for Offshore Wind Farms

Helical piles can be the high capacity foundation needed to meet the growing demand for wind energy production. Predrilling alleviates the need for large torque to install high capacity helical piles, but affects its lateral performance. The paper describes 3D numerical analyses of field pile lateral load tests that have been used to study the effect of predrilling on the lateral resistance of helical piles. The field tests compare between the lateral performances of predrilled helical piles and that of typically installed ones. The paper also compares between predictions of the lateral performance of helical piles using p-y analysis (Lpile Plus 5.0) and the finite element method (FEM, PLAXIS 3D). The study investigates how each analysis captures the effect of predrilling on the lateral capacity. The FEM predictions showed better agreement with measured behavior in field tests for both predrilled and typical cases. The 3D model considers a remolded zone around the pile with reduced stiffness and shear parameters to capture the effect of installation. The analysis showed that similar results are achieved by adjusting the strength reduction factor of the interface element.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References;
  • Pagination: pp 449-458
  • Monograph Title: Geo-Chicago 2016: Geotechnics for Sustainable Energy

Subject/Index Terms

Filing Info

  • Accession Number: 01612445
  • Record Type: Publication
  • ISBN: 9780784480137
  • Files: TRIS, ASCE
  • Created Date: Aug 11 2016 3:06PM