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Nonlinear soil-pile interaction induced by ground settlements: pile displacements and internal forces

Franza, Andrea; Marshall, Alec M.; Jimenez, Rafael

Authors

Andrea Franza

ALEC MARSHALL alec.marshall@nottingham.ac.uk
Professor of Geotechnical Engineering

Rafael Jimenez



Abstract

In urban areas, the construction of tunnels and deep-excavations beneath and near to pile foundations can be detrimental for the superstructure and the foundation. A two-stage continuum-based nonlinear soil-pile interaction model is presented in this paper for predicting the axial and flexural response of piles affected by ground movements. The model accounts for the effects of near-pile non-linear (hyperbolic) soil stiffness degradation and unloading effects. The approach is used to analyse the relationship between the pile axial response (both displacements and internal forces) and greenfield ground settlements for purely-frictional and floating piles in uniform ground. Both displacement and non-displacement piles are analysed by applying appropriate pre-excavation loading sequences. Results demonstrate the influence of initial safety factor, installation method, and capacity distribution (between shaft and base) on pile settlements and on critical tensile axial forces (both in terms of magnitude and depth). Dimensionless design charts are provided to estimate pile settlements and critical axial forces for the case of greenfield settlements that either increase or decrease linearly with depth. These charts provide a rational and more general framework to describe excavation-induced effects on piles than empirical methods.

Citation

Franza, A., Marshall, A. M., & Jimenez, R. (2019). Nonlinear soil-pile interaction induced by ground settlements: pile displacements and internal forces. Géotechnique, 71(3), Article 239-249. https://doi.org/10.1680/jgeot.19.p.078

Journal Article Type Article
Acceptance Date Sep 10, 2019
Online Publication Date Oct 9, 2019
Publication Date Oct 9, 2019
Deposit Date Sep 18, 2019
Publicly Available Date Mar 28, 2024
Journal Géotechnique
Print ISSN 0016-8505
Electronic ISSN 1751-7656
Publisher Thomas Telford
Peer Reviewed Peer Reviewed
Volume 71
Issue 3
Article Number 239-249
DOI https://doi.org/10.1680/jgeot.19.p.078
Keywords excavation piles & piling settlement soil/structure interaction tunnels & tunnelling
Public URL https://nottingham-repository.worktribe.com/output/2630088
Publisher URL https://www.icevirtuallibrary.com/doi/abs/10.1680/jgeot.19.p.078

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