CHD pile performance, part II: Numerical modelling

Jonathan Adam Knappett, Karlis Caucis, Michael John Brown (Lead / Corresponding author), John Ross Jeffrey, Jonathan David Ball

Research output: Contribution to journalArticle

9 Citations (Scopus)
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Abstract

In this paper, a set of simple modelling procedures are presented that can be used to estimate the load-settlement behaviour of Continuous Helical Displacement (CHD) piles in sands, in conjunction with the Finite Element Method (FEM). The approach makes use of a stress and strain dependent non-linear soil model that can be parameterised using basic soil data (principally relative density) that can be determined through routine site investigation (e.g. SPT, CPT). The procedures are validated against a database of 1-g physical model tests reported in the Companion Paper, where they are shown to be suitable for estimating the load-settlement behaviour of CHD piles within the serviceability range. In this way they are complimentary to the analytical method for estimating the ultimate capacity of a CHD pile which was developed in the Companion Paper. In the final part of the paper, the FEM and analytical model are applied to four historical field pile load tests on CHD piles conducted at three different sand sites where they are (i) further validated; and (ii) used to discuss potential savings in pile material and therefore cost due to additional confidence in performance determination at both ultimate and serviceability limiting states.
Original languageEnglish
Pages (from-to)436-454
Number of pages19
JournalProceedings of the Institution of Civil Engineers: Geotechnical Engineering
Volume169
Issue number5
Early online date21 Apr 2016
DOIs
Publication statusPublished - Oct 2016

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Keywords

  • Geotechnical engineering
  • Piles and piling
  • Models (numerical)

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