Modelling of stress transfer in root-reinforced soils informed by four-dimensional X-ray computed tomography and digital volume correlation data.
Modelling of stress transfer in root-reinforced soils informed by four-dimensional X-ray computed tomography and digital volume correlation data.
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DOI：
10.1098/rspa.2021.0210
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发表时间：
2022-01
期刊：
影响因子：
--
通讯作者：
Bengough AG
中科院分区：
文献类型：
--
作者：
Bull DJ;Smethurst JA;Meijer GJ;Sinclair I;Pierron F;Roose T;Powrie W;Bengough AG
植被通过吸水和根系加固增强土壤抗剪切力。根系加固土壤的分析模型依赖于难以测量的输入参数，导致行为的预测差异很大。根系土壤的不透明异质性导致复杂的土壤-根系相互作用机制，难以量化。作者测量，第一次，在直接剪切过程中，使用X射线计算机断层扫描和数字体积相关的抗剪强度和变形的休闲，柳树根和金雀根土壤。这两种物质在最初和随着剪切的进行都引起剪切区厚度的增加。剪切带厚度最大可达35 mm，通常靠近最厚的根部，并朝向柱的中心。剪切过程中的根延伸比Waldron型模型中假设的三线性根剖面小10-30%，这是由于根曲率。根模拟用于探索根-土界面行为表明，根侧枝锚定的根发挥重要作用。Waldron型模型进行了修改，将不均匀的剪切区的厚度和增长，并准确地预测所观察到的，高达七倍，增加抗剪强度的根加固土壤。
Vegetation enhances soil shearing resistance through water uptake and root reinforcement. Analytical models for soils reinforced with roots rely on input parameters that are difficult to measure, leading to widely varying predictions of behaviour. The opaque heterogeneous nature of rooted soils results in complex soil–root interaction mechanisms that cannot easily be quantified. The authors measured, for the first time, the shear resistance and deformations of fallow, willow-rooted and gorse-rooted soils during direct shear using X-ray computed tomography and digital volume correlation. Both species caused an increase in shear zone thickness, both initially and as shear progressed. Shear zone thickness peaked at up to 35 mm, often close to the thickest roots and towards the centre of the column. Root extension during shear was 10–30% less than the tri-linear root profile assumed in a Waldron-type model, owing to root curvature. Root analogues used to explore the root–soil interface behaviour suggested that root lateral branches play an important role in anchoring the roots. The Waldron-type model was modified to incorporate non-uniform shear zone thickness and growth, and accurately predicted the observed, up to sevenfold, increase in shear resistance of root-reinforced soil.
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DOI：
10.1680/geng.2004.157.4.199
发表时间：
2004-10-01
影响因子：
2.2
作者：
Greenwood, JR;Norris, JE;Wint, J
通讯作者：
Wint, J
影响因子：
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影响因子：
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作者：
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Hallett, P. D.
影响因子：
6.5
作者：
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通讯作者：
Druetta, A.
DOI：
10.1098/rspa.2019.0838
发表时间：
2020-05-27
影响因子：
3.5
作者：
Bull, D. J.;Smethurst, J. A.;Bengough, A. G.
通讯作者：
Bengough, A. G.