For smaller lateral plant roots in coarse-grained soils, a potentially large relative size of soil particles compared to the roots may affect their transverse resistance. Even for the larger roots of trees, particle size effects may be important, e.g. when testing 1:N reduced scale models in a geotechnical centrifuge. The Discrete Element Method (DEM) was used to investigate this problem. A rigid lateral root segment under transverse loading in plane strain was simulated and compared with Finite Element Method (FEM) simulations, where the soil was modelled as a continuum (no particle size effects). Even at the lower root/particle diameter ratios (dr/D50) investigated (6 to 21), particle size effects on transverse capacity were negligible upon push-in, while during uplift, they were observed for dr/D50 < 8, arising from the dimension of the uplifted soil volume above the root. The material properties of roots are also typically diameter dependent. Further simulations of long flexible roots subject to end rotation were performed employing a beam-on-non-linear-Winkler-foundation approach, using p-y curves obtained from the DEM or FEM simulations. Compared with particle-size related effects, diameter-dependent variation of material properties had a much larger controlling effect on root capacity and stiffness as relevant for plant/tree overturning.

Zhang, X., Knappett, J., Ciantia, M., Leung, A., Wang, H., Liang, T. (2024). Root size effects on transverse root-soil interactions. COMPUTERS AND GEOTECHNICS, 165(January 2024) [10.1016/j.compgeo.2023.105860].

Root size effects on transverse root-soil interactions

Ciantia, MO;
2024

Abstract

For smaller lateral plant roots in coarse-grained soils, a potentially large relative size of soil particles compared to the roots may affect their transverse resistance. Even for the larger roots of trees, particle size effects may be important, e.g. when testing 1:N reduced scale models in a geotechnical centrifuge. The Discrete Element Method (DEM) was used to investigate this problem. A rigid lateral root segment under transverse loading in plane strain was simulated and compared with Finite Element Method (FEM) simulations, where the soil was modelled as a continuum (no particle size effects). Even at the lower root/particle diameter ratios (dr/D50) investigated (6 to 21), particle size effects on transverse capacity were negligible upon push-in, while during uplift, they were observed for dr/D50 < 8, arising from the dimension of the uplifted soil volume above the root. The material properties of roots are also typically diameter dependent. Further simulations of long flexible roots subject to end rotation were performed employing a beam-on-non-linear-Winkler-foundation approach, using p-y curves obtained from the DEM or FEM simulations. Compared with particle-size related effects, diameter-dependent variation of material properties had a much larger controlling effect on root capacity and stiffness as relevant for plant/tree overturning.
Articolo in rivista - Articolo scientifico
Distinct Element Method; Root-soil interaction; Sand; Size effects; Vegetation;
English
24-ott-2023
2024
165
January 2024
105860
open
Zhang, X., Knappett, J., Ciantia, M., Leung, A., Wang, H., Liang, T. (2024). Root size effects on transverse root-soil interactions. COMPUTERS AND GEOTECHNICS, 165(January 2024) [10.1016/j.compgeo.2023.105860].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/450598
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