Abstract
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Structural cells, as a form of suspended pavement, increases the resistance of urban trees to uprooting failure by confining the roots from growing above ground surface.
Abstract
Trees planted in urban environment may be prone to uprooting due to poor root development and lack of anchorage in the soil. The stability of the tree can be improved by implementing suspended pavement system to encourage growth of tree root below ground surface. A type of suspended pavement has been developed and used in this study, subsequently referred to as structural cell (SC). Numerical analyses were carried out to investigate the contribution of the SC on the stability of Samanea saman, a common urban tree in Singapore with a shallow root system. A simplified tree–root–soil model was adopted for a parametric study by varying root length at both sides of the tree from 1 to 3 m with an interval of 0.5 m. The SC was added to the model as a confinement on top of the shallow roots to give additional resistance against uprooting. Results show that the SC implementation increased the load resistance to uprooting by reducing the strain developed in root plate base and the underlying soil. However, the tensile and compressive stress on the top fibre of root plate at the windward and leeward sides of tree trunk increased due to the presence of SC. Overall, the presence of SC increases the tree resistance to wind load by 2.5–3.3 times the resistance of the tree without SC.
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Anyomi KA, Mitchell SJ, Ruel JC (2016) Windthrow modelling in old-growth and multi-layered boreal forests. Ecol Model 327(2016):105–114. doi:10.1016/j.ecolmodel.2016.02.003
ASTM D3080-04 (2004) Standard test method for direct shear test of soils under consolidated drained conditions. ASTM International, West Conshohocken, PA. doi:10.1520/D3080-04
ASTM D4767-11 (2011) Standard test method for consolidated undrained triaxial compression test for cohesive soils. ASTM International, West Conshohocken, PA. doi:10.1520/D4767-11
Bartens J, Wiseman PE, Smiley ET (2010) Stability of landscape trees in engineered and conventional urban soil mixes. Urban For Urban Green 9:333–338. doi:10.1016/j.ufug.2010.06.005
Bischetti GB, Chiadaria EA, Simonato T, Speziali B, Vitali B, Vullo P, Zocco A (2005) Root strength and root area ratio of forest species in Lombardy (Northen Italy). Plant Soil 278:11–22. doi:10.1007/s11104-005-0605-4
Blackburn P, Petty JA, Miller KF (1998) Assessment of the static and dynamic factors involved in wind throw. Forestry 61(1):29–43
Cofie P, Koolen AJ (2001) Test speed and other factors affecting the measurement of tree root properties used in soil reinforcement models. Soil Tillage Res 63:51–56
Coutts MP (1986) Components of tree stability in Sitka spruce on peaty gley soil. Forestry 59:173–197
Cucchi V, Meredieu C, Stokes A, Berthier S, Bert D, Najar M, Denis A, Lastennet R (2004) Root anchorage of inner and edge trees in stands of Maritime pine growing in different podzolic soil conditions. Trees 18:460–466. doi:10.1007/s00468-004-0330-2
Day SD, Dickinson SB (2008) Managing storm-water for urban sustainability using trees and structural soils. Virginia Polytechnic Institute and State University, Blacksburg
Dupuy L, Fourcaud T, Stokes A (2005) A numerical investigation into the influence of soil type and root architecture on tree anchorage. Plant Soil 278:119–134
Geo-Slope International Ltd (2012) Stress-deformation modelling using SIGMA/W, an engineering methodology, 4th edn. Geo-Slope International Ltd, Calgary, p 325
Grabosky J, Bassuk N (2008) Sixth-and tenth-year growth measurements for three tree species in a load-bearing stone-soil blend under pavement and a tree lawn in Brooklyn, New York, US. Arboric Urban For 34(4):265–266
Grabosky J, Gilman E (2004) Measurement and prediction of tree growth reduction from tree planting space design in established parking lots. J Arboric 30:154–164
Grabosky J, Bassuk NL, Townbridge P (2002) Structural soil—a new medium to allow urban trees to grow in pavement. Landscape architecture. Landscape Architecture Information Series (LATIS) American Society of Landscape Architecture
Keong LC (2004) Wind effect on trees and roof garden. Final Year Project Report, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore
Lee TT (2016) Effect of rainfall on tree stability. PhD Thesis. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore
Liepic J, Hatano R (2003) Quantification of Compaction effect on soil physical properties and crop growth. Geoderma 116:107–136
Mattheck K, Breloer H (1994) The body language of trees, a handbook for failure analysis. Her Majesty’s Stationary Office, London, p 240
Ow LF, Harnas FR, Indrawan IGB, Sahadewa A, Sim EK, Rahardjo H, Leong EC, Fong YK, Tan PY (2010) Tree-pulling experiment: an analysis into the mechanical stability of rain trees. Trees Struct Funct 24:1007–1015. doi:10.1007/s00468-010-0470-5
Page JL, Winston RJ, Hunt WF III (2015) Soil beneath suspended pavements: an opportunity for storm-water control and treatment. Ecol Eng 82:40–48. doi:10.1016/j.ecoleng.2015.04.060
Peltola HM (2006) Mechanical stability of trees under static loads. Am J Bot 93(10):1501–1511
Rahardjo H, Harnas FR, Leong EC, Tan PY, Fong YK, Sim EK (2009) Tree stability in an improved soil to withstand wind loading. Urban For Urban Green 8(4):237–247. doi:10.1016/j.ufug.2009.07.001
Rahardjo H, Harnas FR, Indrawan IGB, Leong EC, Tan PY, Fong YK, Ow LF (2014) Understanding the stability of Samanea Saman trees through tree pulling, analytical calculations and numerical models. Urban For Urban Green 13:355–364. doi:10.1016/j.ufug.2013.12.002
Rahimi A, Rahardjo H, Leong EC, Lee TT, Law AWK, Fong YK (2015) Effect of infiltration characteristics of soil on tree stability, unsaturated soil mechanics—from theory to practice. In: Chen et al. (eds) Proceedings of 6th Asia Pacific Conference on Unsaturated Soils-Guilin, China, pp 791–796
Rahman MA, Stringer P, Ennos AR (2013) Effect of pit design and soil composition on performance of Pyrus calleryana street trees in the establishment period. Arboric Urban For 39(6):256–266
Smiley T, Calfee L, Fraedrich B, Smiley E (2006) Comparison of structural soil and noncompacted soils for trees surrounded by pavement. Arboric Urban For 32(4):164–169
Standards Australia (2004) Bridge Design Part 2. Design Loads AS5100. Standards Australia, Australia
Staples WS, Elevitch CR (2006) Samanea Saman (Rain Tree). Permanent Agricultural Resources. p 15. http://www.traditionaltree.org
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This study was supported through the Core Innovation Grant provided by the Ministry of National Development, Singapore as a collaborative project that involved the National Parks Boards, Singapore and the Nanyang Technological University, Singapore.
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Communicated by T. Roetzer.
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Rahardjo, H., Gofar, N., Amalia, N. et al. Structural cell contribution to resistance of trees to uprooting. Trees 30, 1843–1853 (2016). https://doi.org/10.1007/s00468-016-1417-2
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DOI: https://doi.org/10.1007/s00468-016-1417-2