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Physical modelling of soil-structure interaction of tree root systems under lateral loads
| Content Provider | Scilit |
|---|---|
| Author | Zhang, X. Knappett, J. A. Leung, A. K. Liang, T. |
| Copyright Year | 2018 |
| Description | Book Name: Physical Modelling in Geotechnics |
| Abstract | This paper presents some initial physical modelling of root-soil interaction for trees under lateral loading, such as from wind or debris flows. 3-D printing of interconnected systems of ABS plastic root analogues, which are mechanically representative of tree roots, is used to produce idealised root architectures with varying root depth, spread and root area ratio (RAR, i.e. amount of roots). These models are installed within a granular soil with a wooden model trunk attached and laterally loaded to measure the push-over behaviour. From this data, the moment capacity and rotational stiffness of the model root systems are evaluated. The results suggest that (i) the effect of the central tap root on strength and stiffness is low, compared to the lateral and sinker roots, but otherwise proportional to RAR; and (ii) that development of analytical predictive models may be able to adapt existing procedures for conventional geotechnical systems, such as pile groups. This chapter presents some initial physical modelling of root-soil interaction for trees under lateral loading, such as from wind or debris flows. 3-D printing of interconnected systems of Acrylonitrile Butadiene Styrene (ABS) plastic root analogues, which are mechanically representative of tree roots, is used to produce idealised root architectures with varying root depth, spread and root area ratio. The fabrication process, which involves progressive layering of the ABS plastic, was exploited to print the root analogues with the layering running along the vertical root axis, to approximate the fibrous structure of real roots. The thick main stem of a tree, which is also called the trunk, transfers lateral loading directly to the root systems via the stump. A linear actuator was then used to conduct lateral load tests close to the bottom of the trunk to measure the rotational stiffness and moment capacity of the root systems acting as foundations, and including the second-order P-Δ effects from the trunk. |
| Related Links | http://discovery.dundee.ac.uk/ws/files/30672812/ICPMG_Paper221_AAM.pdf https://content.taylorfrancis.com/books/download?dac=C2018-0-86959-9&isbn=9780429438660&doi=10.1201/9780429438660-70&format=pdf |
| Ending Page | 486 |
| Page Count | 6 |
| Starting Page | 481 |
| DOI | 10.1201/9780429438660-70 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2018-07-11 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Physical Modelling in Geotechnics Geological Engineering Plastic Modelling Structure Lateral Loading Root Area Initial Physical Root Soil Mechanically Representative |
| Content Type | Text |
| Resource Type | Chapter |
