Observing strain localisation processes in bio-cemented sand using x-ray imaging
(2011) In Granular Matter 13. p.247-250- Abstract
- In-situ x-ray tomography has been used to follow deformation processes in 3D during two triaxial compression tests, one on a specimen of bio-cemented Ottawa 50-70 sand and the other on a specimen of the non-cemented sand. The global stress-strain responses show that the bio-cementation process increases the shear strength (peak deviator stress is approximately doubled), and causes the material to exhibit a linear behaviour up until peak, as well as increasing the dilatancy angle. The residual strength of the two samples is very close at large strain. Quantitative 3D digital image analysis (porosity, cement-density and strain field measurements), reveals that a dilatant shear band gradually develops pre-peak in the reference material. The... (More)
- In-situ x-ray tomography has been used to follow deformation processes in 3D during two triaxial compression tests, one on a specimen of bio-cemented Ottawa 50-70 sand and the other on a specimen of the non-cemented sand. The global stress-strain responses show that the bio-cementation process increases the shear strength (peak deviator stress is approximately doubled), and causes the material to exhibit a linear behaviour up until peak, as well as increasing the dilatancy angle. The residual strength of the two samples is very close at large strain. Quantitative 3D digital image analysis (porosity, cement-density and strain field measurements), reveals that a dilatant shear band gradually develops pre-peak in the reference material. The cemented sample however undergoes an abrupt change of deformation mechanism at peak stress: from homogeneous deformation to localised dilatant shearing, which is associated with a local loss of cementation. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2441183
- author
- Tagliaferri, Francesco ; Waller, Jack ; Ando, Edward ; Hall, Stephen LU ; Viggiani, Gioacchino ; Besuelle, Pierre and DeJong, Jason T.
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Granular Matter
- volume
- 13
- pages
- 247 - 250
- publisher
- Springer
- external identifiers
-
- scopus:79958178352
- ISSN
- 1434-7636
- DOI
- 10.1007/s10035-011-0257-4
- language
- English
- LU publication?
- no
- additional info
- 3
- id
- 18a66339-32d3-4fcb-9a92-b48e7c103ce5 (old id 2441183)
- date added to LUP
- 2016-04-04 07:54:19
- date last changed
- 2022-03-30 22:55:59
@article{18a66339-32d3-4fcb-9a92-b48e7c103ce5,
abstract = {{In-situ x-ray tomography has been used to follow deformation processes in 3D during two triaxial compression tests, one on a specimen of bio-cemented Ottawa 50-70 sand and the other on a specimen of the non-cemented sand. The global stress-strain responses show that the bio-cementation process increases the shear strength (peak deviator stress is approximately doubled), and causes the material to exhibit a linear behaviour up until peak, as well as increasing the dilatancy angle. The residual strength of the two samples is very close at large strain. Quantitative 3D digital image analysis (porosity, cement-density and strain field measurements), reveals that a dilatant shear band gradually develops pre-peak in the reference material. The cemented sample however undergoes an abrupt change of deformation mechanism at peak stress: from homogeneous deformation to localised dilatant shearing, which is associated with a local loss of cementation.}},
author = {{Tagliaferri, Francesco and Waller, Jack and Ando, Edward and Hall, Stephen and Viggiani, Gioacchino and Besuelle, Pierre and DeJong, Jason T.}},
issn = {{1434-7636}},
language = {{eng}},
pages = {{247--250}},
publisher = {{Springer}},
series = {{Granular Matter}},
title = {{Observing strain localisation processes in bio-cemented sand using x-ray imaging}},
url = {{http://dx.doi.org/10.1007/s10035-011-0257-4}},
doi = {{10.1007/s10035-011-0257-4}},
volume = {{13}},
year = {{2011}},
}