Assessing the contribution of vegetation to slope stability
Assessing the contribution of vegetation to slope stability
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DOI：
10.1680/geng.2004.157.4.199
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发表时间：
2004-10-01
影响因子：
2.2
通讯作者：
Wint, J
中科院分区：
文献类型：
--
作者：
Greenwood, JR;Norris, JE;Wint, J
英国许多与交通基础设施相关的路堤和路基只是微乎其微的稳定。土钉、土工合成材料加固、改善排水和加固地基等工程技术可用来提高稳定性，但成本可能较高。一个成本较低的解决方案可能是利用植物，要么是自己播种的，要么是种植的。与植被相关的好处和坏处一直是一些争论的主题。植被引起的与建筑地基有关的问题有很好的记录，并证实植被可以对岩土参数产生非常显著的影响。适当维护适当的植被可以产生同样重要的影响，以帮助为土坡提供额外的稳定性。本文考虑了植被的潜在工程影响，以及如何在用于稳定性评估的岩土技术框架内对其进行现场表征。树木和灌木根部的直接加固被认为是对斜坡稳定性最重要的贡献之一。英国、希腊和意大利的案例研究展示了如何使用现场牙根拔出测试的结果来估计牙根可用的潜在增强力。提出了一种方案，根据植被的大小和性质在土壤中指定影响区。
Many embankments and cuttings associated with the transportation infrastructure in the UK are only marginally stable. Engineering techniques such as soil nailing, geosynthetic reinforcement, improved drainage and ground improvement by stabilisation are available to improve stability, but the cost can be high. A lower-cost solution may be to utilise vegetation, either self-seeded or planted. The benefits and drawbacks associated with vegetation have been the subject of some debate. The problems caused by vegetation in relation to building foundations are well documented, and confirm that vegetation can have very significant influences on geotechnical parameters. Appropriate properly maintained vegetation can have the same significant influence to help provide additional stability to soil slopes. This paper considers the potential engineering influences of vegetation and how it can be characterised on site within a geotechnical framework for stability assessments. The direct reinforcement available from the roots of trees and shrubs is identified as providing one of the most significant contributions to slope stability. Case studies in the UK, Greece and Italy demonstrate how results from in-situ root pull-out tests may be used to estimate the potential reinforcement forces available from the roots. A scheme is presented to designate zones of influence within the soil according to the size and nature of the vegetation.