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An Evaluation of Tree Roots Effect on Soil Reinforcement by Direct Shear Test  

Cha, Du Song (College of Forest Sciences, Kangwon National Univesity)
Oh, Jae-Heun (Eastern Branch, Forest Research Institute, Gangwon Province)
Publication Information
Journal of Korean Society of Forest Science / v.94, no.4, 2005 , pp. 281-286 More about this Journal
Abstract
Trees enhance slope stability against down slope mass movement through the removal of soil water by transpiration and by the mechanical reinforcement of their roots. To assess the magnitude of this reinforcement on natural slope stability, direct shear tests were made on dry sand reinforced with different array types of roots. Pinus koraiensis was used as root specimens. The peak shear resistance at each normal stress level was measured on the rooted and unrooted soil specimens. Increased soil resistance(${\Delta}S$) by roots was calculated using parameters like internal friction angle and cohesion of tested soil and also evaluated the effects of root array in tested soil. As results, we find that shear resistance increased in tested soil shear box as diameters and arrayed numbers of root specimen increased and cross root array in tested soil had a much greater reinforcing effect than other root arrays. Comparison of traditional root-soil model with experiments showed that simulated reinforce strength by the model was different with those obtained by the experiment due to its linearity.
Keywords
Pinus koraiensis; root-soil model; shear resistance; slope stability;
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