横截面
刚度
粒径
有限元法
离心机
岩土工程
土壤水分
机械
粒子(生态学)
材料科学
数学
几何学
土壤科学
物理
结构工程
复合材料
地质学
工程类
古生物学
海洋学
核物理学
作者
Xingyu Zhang,Jonathan Knappett,Matteo Oryem Ciantia,Anthony Kwan Leung,Hailong Wang,Teng Liang
标识
DOI:10.1016/j.compgeo.2023.105860
摘要
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.
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