CHD pile performance, part II: Numerical modelling

Jonathan Adam Knappett; Karlis Caucis; Michael John Brown; John Ross Jeffrey; Jonathan David Ball

doi:10.1680/jgeen.15.00132

CHD pile performance, part II: Numerical modelling

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

Civil Engineering

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20 Citations (Scopus)

320 Downloads (Pure)

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 language	English
Pages (from-to)	436-454
Number of pages	19
Journal	Proceedings of the Institution of Civil Engineers: Geotechnical Engineering
Volume	169
Issue number	5
Early online date	21 Apr 2016
DOIs	https://doi.org/10.1680/jgeen.15.00132
Publication status	Published - Oct 2016

Keywords

Geotechnical engineering
Piles and piling
Models (numerical)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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Cite this

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title = "CHD pile performance, part II: Numerical modelling",

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.",

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author = "Knappett, {Jonathan Adam} and Karlis Caucis and Brown, {Michael John} and Jeffrey, {John Ross} and Ball, {Jonathan David}",

note = "The fourth author would like to acknowledge the financial support of the Engineering and Physical Sciences Research Council (EPSRC) (funding code CASE/CAN/07/03). The authors are grateful for the additional financial and technical support provided by Roger Bullivant Ltd.",

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AU - Caucis, Karlis

AU - Brown, Michael John

AU - Jeffrey, John Ross

AU - Ball, Jonathan David

N1 - The fourth author would like to acknowledge the financial support of the Engineering and Physical Sciences Research Council (EPSRC) (funding code CASE/CAN/07/03). The authors are grateful for the additional financial and technical support provided by Roger Bullivant Ltd.

PY - 2016/10

Y1 - 2016/10

N2 - 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.

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KW - Models (numerical)

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CHD pile performance, part II: Numerical modelling

Abstract

Keywords

UN SDGs

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Discussion: CHD pile performance: Part I – Physical modelling

Understanding CHD pile performance in granular soils

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