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Quantitative 3D imaging of partially saturated granular materials under uniaxial compression
Citation Link: https://doi.org/10.15480/882.3905
Publikationstyp
Journal Article
Date Issued
2021-08-23
Sprache
English
Author(s)
Institut
TORE-DOI
Journal
Volume
16
Issue
11
Start Page
3573
End Page
3600
Citation
Acta Geotechnica 16 (11): 3573-3600 (2021-11-01)
Publisher DOI
Scopus ID
Publisher
Springer
Gauging the mechanical effect of partial saturation in granular materials is experimentally challenging due to the very low suctions resulting from large pores. To this end, a uniaxial (zero radial stress) compression test may be preferable to a triaxial one where confining pressure and membrane effects may erase the contribution of this small suction; however, volume changes are challenging to measure. This work resolves this limitation by using X-ray imaging during in situ uniaxial compression tests on Hamburg Sand and glass beads at three different initial water contents, allowing a suction-dependent dilation to be brought to the light. The acquired tomography volumes also allow the development of air–water and solid–water interfacial areas, water clusters and local strain fields to be measured at the grain scale. These measurements are used to characterise pertinent micro-scale quantities during shearing and to relate them to the measured macroscopic response. The new and well-controlled data acquired during this experimental campaign are hopefully a useful contribution to the modelling efforts—to this end they are shared with the community.
Subjects
Partially saturated granular soils
Shear strength
Uniaxial compression tests
X-ray computed tomography
DDC Class
550: Geowissenschaften
600: Technik
Funding Organisations
More Funding Information
Laboratoire 3SR is part of the LabEx Tec 21 (Investissements d’Avenir grant agreement n ANR-11-LABX-0030).
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