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Publisher DOI: 10.1007/s11440-021-01315-5
Title: Quantitative 3D imaging of partially saturated granular materials under uniaxial compression
Language: English
Authors: Milatz, Marius  
Hüsener, Nicole  
Andò, Edward 
Viggiani, Gioacchino 
Grabe, Jürgen 
Keywords: Partially saturated granular soils; Shear strength; Uniaxial compression tests; X-ray computed tomography
Issue Date: 23-Aug-2021
Publisher: Springer
Source: Acta Geotechnica 16 (11): 3573-3600 (2021-11-01)
Abstract (english): 
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.
DOI: 10.15480/882.3905
ISSN: 1861-1133
Journal: Acta geotechnica 
Institute: Geotechnik und Baubetrieb B-5 
Document Type: Article
Project: Graduiertenkolleg 2462: Prozesse in natürlichen und technischen Partikel-Fluid-Systemen 
Projekt DEAL 
Funded by: Deutsche Forschungsgemeinschaft (DFG) 
More Funding information: Laboratoire 3SR is part of the LabEx Tec 21 (Investissements d’Avenir grant agreement n ANR-11-LABX-0030).
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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