Stability of containerized urban street trees

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• 作者：F. R. Harnas ; H. Rahardjo ; E. C. Leong ; P. Y. Tan…
• 关键词：Containerized tree ; Urban environment ; Small ; scale model test ; Numerical modeling ; Tree stability
• 刊名：Landscape and Ecological Engineering
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：12
• 期：1
• 页码：13-24
• 全文大小：1,176 KB
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• 作者单位：F. R. Harnas (1)
  H. Rahardjo (1)
  E. C. Leong (1)
  P. Y. Tan (2)
  L. F. Ow (3)
  
  1. School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Blk N1, #1B-36, Singapore, 639798, Singapore
  2. School of Design and Environment, National University of Singapore, 4 Architecture Drive, Singapore, Singapore
  3. CUGE Research, National Park Boards, 1 Cluny Road, Singapore, Singapore
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Landscape Ecology
  Nature Conservation
  Civil Engineering
  Environmental Management
  Landscape, Regional and Urban Planning
  Plant Ecology
  
• 出版者：Springer Japan
• ISSN：1860-188X

文摘

Trees are usually grown in containers in the nursery until they reach a certain size, whereupon they are transplanted to a permanent location. Infrastructure development has often led to the removal of large trees. To maintain lush foliage and trees of a size that benefit urban ecology, trees can be grown in containers. Containerized trees can be moved from one location to another, and this relocation does not require root pruning or crown-size reduction. The drawback to having trees in containers is the small and confined volume of the container, which limits tree root development and thus affects containerized tree stability. The objective of this study was to understand the failure mechanisms for and the effect of the root dimensions on the stability of containerized trees. Therefore, small-scale stability model tests were conducted which were verified using numerical and analytical models. The results identified two failure modes that were likely to occur: tree overturning and container overturning. The mode of failure was dependent on the root dimensions. When the trees had extended their roots deep into the container, the whole container would overturn in the event of failure due to increased root confinement and shear resistance of the soil. On the other hand, the main failure mechanism when there was shallow root development was the uplifting of the tree from the container while the container remained upright. The results from numerical and analytical models were consistent with those obtained during the small-scale model stability tests.