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Mathematical and computational modelling of vegetated soil incorporating hydraulically-driven finite strain deformation

Mathematical and computational modelling of vegetated soil incorporating hydraulically-driven finite strain deformation
Mathematical and computational modelling of vegetated soil incorporating hydraulically-driven finite strain deformation
In this paper a new model for the hydro-mechanical behaviour of rooted soils is developed. It is a physically-based model that couples finite strain soil deformation with unsaturated water and air flow, while improving on existing cohesion-based approaches to mechanical root reinforcement and empirical soil water-uptake approaches typically used to deal with rooted slopes. The model is used to show that the dynamics of soil-water pressure and soil deformation depend strongly on the physics of the root-water uptake and the elasto-plastic soil mechanics. Root water uptake can cause suctions and corresponding soil shrinkage sufficiently large to necessitate a finite-strain approach. Although this deformation can change the intrinsic permeability, hydraulic conductivity remains dominated by the water content. The model incorporates simultaneous air-flow, but this is shown to be unimportant for soil-water dynamics under the conditions assumed in example simulations. The mechanical action of roots is incorporated via a root stress tensor and a simulation is used to show how root tension is mobilised within a swelling soil. The developed model may be used to simulate both laboratory experiments and full-scale vegetated slopes.
slope, vegetated soil, roots, Landslide, large-strain
0266-352X
Woodman, Nicholas
9870f75a-6d12-4815-84b8-6610e657a6ad
Smethurst, Joel
8f30880b-af07-4cc5-a0fe-a73f3dc30ab5
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Meijer, G.
0bd6d1bd-5036-4e6d-ac30-ea35b81d7448
Knappett, J.
890ca07e-3111-4135-877b-56c3028b0b4b
Dias, T.
f1d6edfe-d128-4c37-9312-fafcf81d929c
Woodman, Nicholas
9870f75a-6d12-4815-84b8-6610e657a6ad
Smethurst, Joel
8f30880b-af07-4cc5-a0fe-a73f3dc30ab5
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Meijer, G.
0bd6d1bd-5036-4e6d-ac30-ea35b81d7448
Knappett, J.
890ca07e-3111-4135-877b-56c3028b0b4b
Dias, T.
f1d6edfe-d128-4c37-9312-fafcf81d929c

Woodman, Nicholas, Smethurst, Joel, Roose, Tiina, Powrie, William, Meijer, G., Knappett, J. and Dias, T. (2020) Mathematical and computational modelling of vegetated soil incorporating hydraulically-driven finite strain deformation. Computers and Geotechnics, 127, [103754]. (doi:10.1016/j.compgeo.2020.103754).

Record type: Article

Abstract

In this paper a new model for the hydro-mechanical behaviour of rooted soils is developed. It is a physically-based model that couples finite strain soil deformation with unsaturated water and air flow, while improving on existing cohesion-based approaches to mechanical root reinforcement and empirical soil water-uptake approaches typically used to deal with rooted slopes. The model is used to show that the dynamics of soil-water pressure and soil deformation depend strongly on the physics of the root-water uptake and the elasto-plastic soil mechanics. Root water uptake can cause suctions and corresponding soil shrinkage sufficiently large to necessitate a finite-strain approach. Although this deformation can change the intrinsic permeability, hydraulic conductivity remains dominated by the water content. The model incorporates simultaneous air-flow, but this is shown to be unimportant for soil-water dynamics under the conditions assumed in example simulations. The mechanical action of roots is incorporated via a root stress tensor and a simulation is used to show how root tension is mobilised within a swelling soil. The developed model may be used to simulate both laboratory experiments and full-scale vegetated slopes.

Text
Woodman et al revised June 20 - Accepted Manuscript
Restricted to Repository staff only until 11 August 2022.
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More information

Accepted/In Press date: 21 July 2020
e-pub ahead of print date: 11 August 2020
Published date: November 2020
Keywords: slope, vegetated soil, roots, Landslide, large-strain

Identifiers

Local EPrints ID: 442810
URI: http://eprints.soton.ac.uk/id/eprint/442810
ISSN: 0266-352X
PURE UUID: 9687cb43-de46-496d-bf8a-29333ba92c5c
ORCID for Nicholas Woodman: ORCID iD orcid.org/0000-0002-5571-0451
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: 28 Jul 2020 16:30
Last modified: 07 Oct 2020 01:55

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