Journal
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 476, Issue 2237, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspa.2019.0838
Keywords
direct shear; slope stability; root reinforcement; digital volume correlation; X-ray computed tomography; soil science
Categories
Funding
- UK Engineering and Physical Sciences Research Council [EP/M020177/1, EP/M020355/1]
- University of Dundee
- University of Aberdeen
- Durham University
- James Hutton Institute
- Scottish Government (Rural & Environmental Services & Analytical Services Division)
- University of Southampton
- EPSRC [EP/M020177/1, EP/M020355/1] Funding Source: UKRI
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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 multi-scale 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 multi-scale 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 three-dimensional chronology of soil and root deformation within the shear zone. Digital volume correlation (DVC) analysis was applied to the computed tomography dataset to obtain full-field three-dimensional 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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