Conceptual Development and Numerical Modelling of Vegetation Induced Suction and implications on Rail Track Stabilisation
Conceptual Development and Numerical Modelling of Vegetation Induced Suction and implications on Rail Track Stabilisation
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植被诱导吸力的概念发展和数值模拟及其对铁轨稳定的影响
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
B. Fatahi
中科院分区：
文献类型：
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作者：
B. Indraratna;H. Khabbaz;B. Fatahi
研究了树根对土壤吸力和地面沉降的影响。本文重点介绍了一个概念性的蒸散和根系吸水平衡模型，然后将其纳入一个综合的数值模型的发展的相互关联的参数。开发的数值模型的基础上的有限元分析（ABAQUS）认为完全耦合的流动变形行为的土壤。作者从维多利亚西部的一个现场和过去的文献中获得的现场测量数据被用来验证该模型。尽管为简化土壤非均匀性和各向异性的影响而作了假设，但预测结果与现场数据吻合良好。数值分析表明，所提出的根系吸水模型能够可靠地预测远离树轴的最大基质吸力区域。本文还比较了树根的自然有利作用与土工合成材料垂直排水管在真空压力下的稳定机制。虽然这种类比只适用于浅的垂直排水沟，但这种比较仍然强调了原生植被的明显经济优势。
The effects of tree roots on soil suction and ground settlement are investigated. This paper highlights the inter-related parameters contributing to the development of a conceptual evapo-transpiration and root water uptake equilibrium model that is then incorporated in a comprehensive numerical model. The developed numerical model based on the finite element analysis (ABAQUS) considers fully coupled flowdeformation behaviour of soil. Field measurements obtained by the authors from a field site in western Victoria and from past literature are used to validate the model. The predicted results show acceptable agreement with the field data in spite of the assumptions made for simplifying the effects of soil heterogeneity and anisotropy. The numerical analysis proves that the proposed root water uptake model can reliably predict the region of maximum matric suction away from the tree axis. The paper also compares the natural favourable effect of tree roots with the stabilising mechanisms of geosynthetic vertical drains subjected to vacuum pressure. Although this analogy is only justified for shallow vertical drains, the comparison still emphasises the obvious economical advantages of native vegetation.