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Mechanisms of root-reinforcement in soils: an experimental methodology using four-dimensional X-ray computed tomography and digital volume correlation

Mechanisms of root-reinforcement in soils: an experimental methodology using four-dimensional X-ray computed tomography and digital volume correlation
Mechanisms of root-reinforcement in soils: an experimental methodology using four-dimensional X-ray computed tomography and digital volume correlation
Vegetation on railway or highway slopes can improve slope stability through the generation of soil pore water suctions by plant transpiration and mechanical soil reinforcement by the roots. To incorporate the enhanced shearing resistance and stiffness of root-reinforced soils in stability calculations, it is necessary to understand and quantify its effectiveness. This requires integrated and sophisticated experimental and multiscale modelling approaches to develop an understanding of the processes at different length scales, from individual root-soil interaction through to full soil-profile or slope scale. One of the challenges with multiscale models is ensuring that they sufficiently closely represent real behaviour. This requires calibration against detailed high-quality and data-rich experiments. This study presents a novel experimental methodology, which combines in situ direct shear loading of a willow root reinforced soil with X-ray computed tomography to capture the 3D chronology of soil and root deformation within the shear zone. Digital volume correlation (DVC) analysis was applied to the computed tomography (CT) dataset to obtain full-field 3D displacement and strain information. This paper demonstrates the feasibility and discusses the challenges associated with DVC experiments on root-reinforced soils.
Digital volume correlation, Direct shear, Root reinforcement, Slope stability, Soil science, X-ray computed tomography
1364-5021
1-23
Bull, Daniel
3569ba02-89de-4398-a14d-02c3f9b4eab2
Smethurst, Joel
8f30880b-af07-4cc5-a0fe-a73f3dc30ab5
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Bengough, Anthony G.
ac1f754e-002c-44f6-8907-8771a4cd1fd3
Bull, Daniel
3569ba02-89de-4398-a14d-02c3f9b4eab2
Smethurst, Joel
8f30880b-af07-4cc5-a0fe-a73f3dc30ab5
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Bengough, Anthony G.
ac1f754e-002c-44f6-8907-8771a4cd1fd3

Bull, Daniel, Smethurst, Joel, Sinclair, Ian, Pierron, Fabrice, Roose, Tiina, Powrie, William and Bengough, Anthony G. (2020) Mechanisms of root-reinforcement in soils: an experimental methodology using four-dimensional X-ray computed tomography and digital volume correlation. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 476 (2237), 1-23, [20190838]. (doi:10.1098/rspa.2019.0838).

Record type: Article

Abstract

Vegetation on railway or highway slopes can improve slope stability through the generation of soil pore water suctions by plant transpiration and mechanical soil reinforcement by the roots. To incorporate the enhanced shearing resistance and stiffness of root-reinforced soils in stability calculations, it is necessary to understand and quantify its effectiveness. This requires integrated and sophisticated experimental and multiscale modelling approaches to develop an understanding of the processes at different length scales, from individual root-soil interaction through to full soil-profile or slope scale. One of the challenges with multiscale models is ensuring that they sufficiently closely represent real behaviour. This requires calibration against detailed high-quality and data-rich experiments. This study presents a novel experimental methodology, which combines in situ direct shear loading of a willow root reinforced soil with X-ray computed tomography to capture the 3D chronology of soil and root deformation within the shear zone. Digital volume correlation (DVC) analysis was applied to the computed tomography (CT) dataset to obtain full-field 3D displacement and strain information. This paper demonstrates the feasibility and discusses the challenges associated with DVC experiments on root-reinforced soils.

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Accepted/In Press date: 21 April 2020
e-pub ahead of print date: 20 May 2020
Published date: 27 May 2020
Keywords: Digital volume correlation, Direct shear, Root reinforcement, Slope stability, Soil science, X-ray computed tomography

Identifiers

Local EPrints ID: 439699
URI: http://eprints.soton.ac.uk/id/eprint/439699
ISSN: 1364-5021
PURE UUID: a0380c23-fcf6-4bf0-8101-01045907feb3
ORCID for Daniel Bull: ORCID iD orcid.org/0000-0001-6711-6153
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994
ORCID for Tiina Roose: ORCID iD orcid.org/0000-0001-8710-1063
ORCID for William Powrie: ORCID iD orcid.org/0000-0002-2271-0826

Catalogue record

Date deposited: 30 Apr 2020 16:30
Last modified: 26 Nov 2021 02:55

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Contributors

Author: Daniel Bull ORCID iD
Author: Joel Smethurst
Author: Ian Sinclair
Author: Fabrice Pierron ORCID iD
Author: Tiina Roose ORCID iD
Author: William Powrie ORCID iD
Author: Anthony G. Bengough

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