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Localised deformation in a wide-grained sand under triaxial compression revealed by X-ray tomography and digital image correlation

Takano, Daiki; Lenoir, Nicolas; Otani, Jun and Hall, Stephen LU (2015) In Soils and Foundations 55(4). p.906-915
Abstract
Understanding the mechanisms of deformation and failure of soils is essential in geotechnical engineering. In particular, strain localisation is a key issue for the failure of soils. In laboratory mechanical testing, localised deformation can be investigated efficiently through full-field measurements of displacement and strain in soil specimens. The objective of this study is to investigate the deformation and the failure of a soil under triaxial compression using in situ X-ray (i.e., X-ray scanning during the loading test) computed tomography (CT) and digital image correlation (DIC). This paper is concerned with the characterisation of internal strains and with strain localisation patterning in wide-grained sand undergoing triaxial... (More)
Understanding the mechanisms of deformation and failure of soils is essential in geotechnical engineering. In particular, strain localisation is a key issue for the failure of soils. In laboratory mechanical testing, localised deformation can be investigated efficiently through full-field measurements of displacement and strain in soil specimens. The objective of this study is to investigate the deformation and the failure of a soil under triaxial compression using in situ X-ray (i.e., X-ray scanning during the loading test) computed tomography (CT) and digital image correlation (DIC). This paper is concerned with the characterisation of internal strains and with strain localisation patterning in wide-grained sand undergoing triaxial compression at different confinement pressures using Three Dimensional (3D) volumetric DIC. Complete 3D images of specimens have been recorded at several stages throughout the triaxial tests and analysed using 3D Volumetric DIC in order to obtain 3D incremental displacement and strain fields. Based on the results of the combined X-ray tomography and DIC, the deformation process and especially the strain localisation are quantitatively characterised in space and time under different triaxial compression conditions. (C) 2015 The Japanese Geotechnical Society. Production and hosting by Elsevier Boy. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Wide-grained sand, Triaxial compression, X-ray tomography, Image, analysis, Digital image correlation
in
Soils and Foundations
volume
55
issue
4
pages
906 - 915
publisher
Japanese Geotechnical Society
external identifiers
  • wos:000360657800019
  • scopus:84940720741
ISSN
0038-0806
DOI
10.1016/j.sandf.2015.06.020
language
English
LU publication?
yes
id
ff3237f2-960e-49ce-ab12-ce2a829f1857 (old id 8080541)
date added to LUP
2015-10-26 15:08:29
date last changed
2017-05-21 04:00:56
@article{ff3237f2-960e-49ce-ab12-ce2a829f1857,
  abstract     = {Understanding the mechanisms of deformation and failure of soils is essential in geotechnical engineering. In particular, strain localisation is a key issue for the failure of soils. In laboratory mechanical testing, localised deformation can be investigated efficiently through full-field measurements of displacement and strain in soil specimens. The objective of this study is to investigate the deformation and the failure of a soil under triaxial compression using in situ X-ray (i.e., X-ray scanning during the loading test) computed tomography (CT) and digital image correlation (DIC). This paper is concerned with the characterisation of internal strains and with strain localisation patterning in wide-grained sand undergoing triaxial compression at different confinement pressures using Three Dimensional (3D) volumetric DIC. Complete 3D images of specimens have been recorded at several stages throughout the triaxial tests and analysed using 3D Volumetric DIC in order to obtain 3D incremental displacement and strain fields. Based on the results of the combined X-ray tomography and DIC, the deformation process and especially the strain localisation are quantitatively characterised in space and time under different triaxial compression conditions. (C) 2015 The Japanese Geotechnical Society. Production and hosting by Elsevier Boy. All rights reserved.},
  author       = {Takano, Daiki and Lenoir, Nicolas and Otani, Jun and Hall, Stephen},
  issn         = {0038-0806},
  keyword      = {Wide-grained sand,Triaxial compression,X-ray tomography,Image,analysis,Digital image correlation},
  language     = {eng},
  number       = {4},
  pages        = {906--915},
  publisher    = {Japanese Geotechnical Society},
  series       = {Soils and Foundations},
  title        = {Localised deformation in a wide-grained sand under triaxial compression revealed by X-ray tomography and digital image correlation},
  url          = {http://dx.doi.org/10.1016/j.sandf.2015.06.020},
  volume       = {55},
  year         = {2015},
}