A Mohr-Coulomb-Vilar model for constitutive relationship in root-soil interface under changing suction
A Mohr-Coulomb-Vilar model for constitutive relationship in root-soil interface under changing suction
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DOI：
10.1016/j.sandf.2021.03.005
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发表时间：
2021-06
影响因子：
3.7
通讯作者：
Haruka Tomobe;K. Fujisawa;A. Murakami
中科院分区：
文献类型：
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作者：
Haruka Tomobe;K. Fujisawa;A. Murakami
了解根-土界面的力学相互作用对预测植被坡面的侵蚀是至关重要的。最近，在不断变化的水力条件下的vegetedil的抗剪强度已被测量和建模，但是，根-土界面还没有被研究在不断变化的水力条件下。本文提出了一种新的拔出装置来测量根-土界面在变化吸力下的抗剪强度，（2）根-土界面的Mohr-Coulomb-Vilar（MCV）抗剪强度模型，（3）根-土界面的数值模拟采用节点-分段（NTS）方法沿着与有限元（FEM）方法相结合。数值模拟结果表明，MCV模型与NTS/FEM方法相结合能够较准确地预测吸力变化条件下根-土界面的剪切行为。此外，我们实验评估的拔出问题的根，并表明，本方法提供了合理的预测根拔出问题，即使当吸力是在拔出过程中改变。因此，目前的方法，可以用于预测根-土界面动态变化的吸力和土压力下，仅增加两个额外的参数的Vilar模型。
Understanding mechanical interactions at the root-soil interface is essential to predict the erosion of vegetated slopes. Recently, the shear strength of vegetatedil under changing hydraulic conditions has been measured and modeled; however, root-soil interfaces have not been investigated under changing hydraulic conditions. This paper proposes (1) a novel pullout apparatus to measure the shear strength at the root-soil interface under changing suction, (2) a Mohr-Coulomb-Vilar (MCV) shear strength model of root-soil interfaces, and (3) a numerical simulation using Node-To-Segment (NTS) approach along with Finite Element Method (FEM). The pullout tests were verified using the numerical simulation, and the results showed that the combination of the MCV model and NTS/FEM approach can accurately predict the shear behavior of root-soil interfaces under changing suction. In addition, we experimentally evaluated the pullout problem of roots and showed that the present method provides reasonably predicts root-pullout problems even when the suction is changed during the pullout process. The current method, therefore, can be used for predicting root-soil interface dynamics under varying suction and soil pressure by only adding two additional parameters of the Vilar model.