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Cavity expansion analysis of pile installation in chalk using synchrotron X-ray computed tomography

Cavity expansion analysis of pile installation in chalk using synchrotron X-ray computed tomography
Cavity expansion analysis of pile installation in chalk using synchrotron X-ray computed tomography
Pile installation in chalk was investigated using physical models and in-situ synchrotron X-ray computed tomography. The aim was to quantify void ratio (e) changes in the chalk induced by pile penetration and assess the suitability of drained cavity expansion theory to predict these changes using a critical state model with plastic hardening and cementation degradation. Two experiments were carried out: a cone-tipped pile was slowly and monotonically pushed into the sample to model drained penetration, and an open-ended tube pile was cyclically jacked at a fast rate to mimic partially undrained pile driving. Cavity expansion analysis accurately predicted the remoulded chalk e values at the pile wall for both experiments. It also delivered accurate predictions of the radial e profiles of the remoulded zone, but accuracy slightly decreased for the partially undrained case. Radial e profile predictions for an exhumed field-scale pile from the literature yielded similar results. Analytical results were highly sensitive to the intact chalk density, which affected plastic hardening. The initial stiffness also affected results, but to a lesser degree. The cementation degradation rate had a negligible effect, as cementation strength was found to be small compared to stresses mobilised during plastic hardening.
Chalk, Displacement piles, synchrotron tomography, cavity expansion, physical modelling
1069-1074
Australian Geomechanics Society
Alvarez-Borges, Fernando
5512cdfd-6ad3-475f-8aec-2fc767607314
Atwood, Robert
853929bc-679d-47bb-8ba8-acd139fc857e
Connolley, Thomas
baeb481e-885f-4ac9-ad83-fc6537ac5337
Vo, Nghia
5dccb7ee-1aa0-4b42-b9e1-5eed7aeea2a5
Ahmed, Sharif
ddc6bab1-9d76-4391-b7ea-ae68d6f3924d
Madhusudhan, B.N.
366ffcb0-657c-4897-8f72-8621f36af32f
Richards, David J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Rahman, Mizanur
Jaska, Mark
Alvarez-Borges, Fernando
5512cdfd-6ad3-475f-8aec-2fc767607314
Atwood, Robert
853929bc-679d-47bb-8ba8-acd139fc857e
Connolley, Thomas
baeb481e-885f-4ac9-ad83-fc6537ac5337
Vo, Nghia
5dccb7ee-1aa0-4b42-b9e1-5eed7aeea2a5
Ahmed, Sharif
ddc6bab1-9d76-4391-b7ea-ae68d6f3924d
Madhusudhan, B.N.
366ffcb0-657c-4897-8f72-8621f36af32f
Richards, David J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Rahman, Mizanur
Jaska, Mark

Alvarez-Borges, Fernando, Atwood, Robert, Connolley, Thomas, Vo, Nghia, Ahmed, Sharif, Madhusudhan, B.N. and Richards, David J. (2022) Cavity expansion analysis of pile installation in chalk using synchrotron X-ray computed tomography. Rahman, Mizanur and Jaska, Mark (eds.) In Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering. Australian Geomechanics Society. pp. 1069-1074 .

Record type: Conference or Workshop Item (Paper)

Abstract

Pile installation in chalk was investigated using physical models and in-situ synchrotron X-ray computed tomography. The aim was to quantify void ratio (e) changes in the chalk induced by pile penetration and assess the suitability of drained cavity expansion theory to predict these changes using a critical state model with plastic hardening and cementation degradation. Two experiments were carried out: a cone-tipped pile was slowly and monotonically pushed into the sample to model drained penetration, and an open-ended tube pile was cyclically jacked at a fast rate to mimic partially undrained pile driving. Cavity expansion analysis accurately predicted the remoulded chalk e values at the pile wall for both experiments. It also delivered accurate predictions of the radial e profiles of the remoulded zone, but accuracy slightly decreased for the partially undrained case. Radial e profile predictions for an exhumed field-scale pile from the literature yielded similar results. Analytical results were highly sensitive to the intact chalk density, which affected plastic hardening. The initial stiffness also affected results, but to a lesser degree. The cementation degradation rate had a negligible effect, as cementation strength was found to be small compared to stresses mobilised during plastic hardening.

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ICSMGE_2022-183 - Version of Record
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More information

Published date: 7 June 2022
Venue - Dates: 20th International Conference on Soil Mechanics and Geotechnical Engineering, International Convention Centre, Sydney, Australia, 2022-05-01 - 2022-05-05
Keywords: Chalk, Displacement piles, synchrotron tomography, cavity expansion, physical modelling

Identifiers

Local EPrints ID: 484448
URI: http://eprints.soton.ac.uk/id/eprint/484448
PURE UUID: 419b1c72-571e-4130-aa4b-0f189743c306
ORCID for Fernando Alvarez-Borges: ORCID iD orcid.org/0000-0002-6940-9918

Catalogue record

Date deposited: 16 Nov 2023 12:13
Last modified: 12 Jun 2024 02:04

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Contributors

Author: Fernando Alvarez-Borges ORCID iD
Author: Robert Atwood
Author: Thomas Connolley
Author: Nghia Vo
Author: Sharif Ahmed
Author: B.N. Madhusudhan
Editor: Mizanur Rahman
Editor: Mark Jaska

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