Undrained capacity of circular shallow foundations under combined VHMT loading

Pengpeng He (Lead / Corresponding author), Tim Newson

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Abstract

Wind turbine (WT) foundations are generally subjected to large combined vertical, horizontal, moment, and torsional (VHMT) loads. The available investigations of the ultimate limit states of WT foundations focus predominately on unlimited-tension soil-foundation interfaces that are more appropriate for offshore settings. However, the interfaces for onshore WT foundations are generally unable to resist tensile loads. To address this omission, a zero-tension interface is used to investigate the VHMT failure envelope of circular shallow foundations under undrained soil conditions using finite element analysis. The effects of soil strength heterogeneity and foundation embedment were investigated. The results show that torsional loads reduce the VHM bearing capacity of circular foundations. The foundation embedment is also found to significantly increase the foundation bearing capacity. A full 4-D analytical expression for the VHMT failure envelope has been proposed based on the calculated failure envelopes.

Original languageEnglish
Pages (from-to)1452-1470
Number of pages19
JournalWind Engineering
Volume46
Issue number5
Early online date11 Mar 2022
DOIs
Publication statusPublished - Oct 2022

Keywords

  • circular foundation
  • failure envelope
  • finite element analysis
  • Wind turbine
  • zero-tension interface

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