Scaling of the reinforcement of soil slopes by living plants in a geotechnical centrifuge
Scaling of the reinforcement of soil slopes by living plants in a geotechnical centrifuge
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DOI：
10.1016/j.ecoleng.2017.06.067
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发表时间：
2017-12-01
影响因子：
3.8
通讯作者：
Meijer, G. J.
中科院分区：
文献类型：
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作者：
Liang, T.;Bengough, A. G.;Meijer, G. J.
为了探索斜坡尺度的整体行为而进行的全尺寸测试的成本和实用性，以及迄今为止依赖于模型根类似物的小规模测试的理想化性质，阻碍了对植被斜坡的根系加固的理解。在这项研究中，我们研究了在小规模斜坡破坏实验中使用活植物根的可能性，该实验将使用土工离心机来实现与现场同源点相当的土壤应力状态。选择三种植物（柳树、金雀花草和金雀花草），分别对应具有不同根系结构和木质性的不同植物群，并进行短期栽培（柳树和金雀花草为 2 个月，金雀花草为 3 个月）。然后测量了这些幼根样品的形态、拉伸强度和杨氏模量及其对增加土壤剪切强度的影响（通过拉伸试验和直接剪切试验），并与更成熟的田间生长样本的已发表结果进行比较。我们的测试结果表明，当考虑三个物种的所有幼根样本时，常用的负幂定律不能很好地拟合根抗拉强度与根直径之间关系的数据，导致 R-2 值非常低（R2
Understanding root-reinforcement of vegetated slopes is hindered by the cost and practicality of full scale tests to explore global behaviour at the slope scale, and the idealised nature of smaller-scale testing to date that has relied on model root analogues. In this study we investigated the potential to use living plant roots in small scale experiments of slope failure that would use a geotechnical centrifuge to achieve soil stress states comparable to those in the field at homologous points. Three species (Willow, Gorse and Festulolium grass), corresponding to distinct plant groups with different root architecture and Woodiness' were selected and cultivated for short periods (2 months for Willow and Festulolium grass, 3 months for Gorse). The morphologies, tensile strength and Young's modulus of these juvenile root samples and their effects on increasing soil shear strength were then measured (via tensile tests and direct shear tests) and compared with published results of more mature field grown specimens. Our test results show that when all juvenile root samples of the three species are considered, the commonly used negative power law does not fit the data for the relationship between root tensile strength and root diameter well, resulting in very low R-2 values (R2