Assessing the contribution of vegetation to slope stability

IF 0.3 Q4 ENGINEERING, GEOLOGICAL
J. Greenwood, J. Norris, J. Wint
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引用次数: 161

Abstract

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.
评估植被对边坡稳定性的贡献
在英国,许多与交通基础设施相关的路堤和岩屑只是略微稳定。土钉、土工合成加固、改善排水和通过稳定改善地面等工程技术可用于提高稳定性,但成本可能很高。成本较低的解决方案可能是利用植物,无论是自种还是种植。与植被相关的好处和缺点一直是一些争论的主题。植被对建筑基础造成的问题有充分的记录,并证实植被对岩土参数有非常重大的影响。适当、妥善维护的植被也能产生同样重要的影响,有助于为土壤斜坡提供额外的稳定性。本文考虑了植被的潜在工程影响,以及如何在稳定性评估的岩土工程框架内对其进行现场表征。从树木和灌木的根中获得的直接加固被确定为对边坡稳定提供最重要的贡献之一。英国、希腊和意大利的案例研究表明,如何利用现场拔根试验的结果来估计从根部获得的潜在加固力。根据植被的大小和性质,提出了一种在土壤中划定影响区域的方案。
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来源期刊
Geotechnical Engineering
Geotechnical Engineering ENGINEERING, GEOLOGICAL-
CiteScore
0.50
自引率
0.00%
发文量
0
期刊介绍: The objectives of the Association shall be the promotion of co-operation among geotechnical societies in SE Asia; and the assistance to member societies who have limited number of members. Now there is only one combined web titled: AGSSEA-SEAGS. SEAGS & AGSSEA encourage the submission of scholarly and practice-oriented articles to its journal. The journal is published quarterly. Both sponsors of the journal, the Southeast Asian Geotechnical Society and the Association of Geotechnical Societies in Southeast Asia, promote the ideals and goals of the International Society of Soil Mechanics and Geotechhnical Engineering in fostering communications, developing insights and enabling the advancement of the geotechnical engineering discipline.
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