Yang, LT, Li, X, Yu, HS et al. (1 more author) (2016) A laboratory study of anisotropic geomaterials incorporating recent micromechanical understanding. Acta Geotechnica, 11 (5). pp. 1111-1129. ISSN 1861-1125
Abstract
This paper presents an experimental investigation revisiting the anisotropic stress–strain–strength behaviour of geomaterials in drained monotonic shear using hollow cylinder apparatus. The test programme has been designed to cover the effect of material anisotropy, preshearing, material density and intermediate principal stress on the behaviour of Leighton Buzzard sand. Experiments have also been performed on glass beads to understand the effect of particle shape. This paper explains phenomenological observations based on recently acquired understanding in micromechanics, with attention focused on strength anisotropy and deformation non-coaxiality, i.e. non-coincidence between the principal stress direction and the principal strain rate direction. The test results demonstrate that the effects of initial anisotropy produced during sample preparation are significant. The stress–strain–strength behaviour of the specimen shows strong dependence on the principal stress direction. Preloading history, material density and particle shape are also found to be influential. In particular, it was found that non-coaxiality is more significant in presheared specimens. The observations on the strength anisotropy and deformation non-coaxiality were explained based on the stress–force–fabric relationship. It was observed that intermediate principal stress parameter b(b = (σ2 − σ3)/(σ1 − σ3)) has a significant effect on the non-coaxiality of sand. The lower the b-value, the higher the degree of non-coaxiality is induced. Visual inspection of shear band formed at the end of HCA testing has also been presented. The inclinations of the shear bands at different loading directions can be predicted well by taking account of the relative direction of the mobilized planes to the bedding plane.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015, The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
Keywords: | Anisotropy; discrete elements; laboratory tests; numerical models; plasticity; sand (soil type) |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > EPS Faculty Services (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 Nov 2016 16:21 |
Last Modified: | 30 Jun 2020 14:55 |
Published Version: | http://doi.org/10.1007/s11440-015-0423-7 |
Status: | Published |
Publisher: | Springer Verlag |
Identification Number: | 10.1007/s11440-015-0423-7 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:107171 |