Stabilization of river terraces and natural soil slopes in rangelands by means of tree roots as a reinforcement agent is an environmental adopted method which needs to be developed. In this research a series of tests was carried out on soil blocks containing willow roots and without roots using a large scale in situ direct shear test apparatus. The results were analyzed based on direct shear theory to calculate the cohesion and internal friction angle of rooted and non-rooted soil. The results reveal that in spite of a slight decrease of 8% in the internal friction angle, the appearance cohesion of lean clay soils increase significantly up to 130%. The results of this research are presented in forms of linear and logarithmic relations between increased shear strength and root density at different depths of soil.
Davoudi,M H . (2009). Variation of shear resistance parameters in fine grain soils due to willow roots density. Journal of Range and Watershed Managment, 62(2), 231-245.
MLA
Davoudi,M H . "Variation of shear resistance parameters in fine grain soils due to willow roots density", Journal of Range and Watershed Managment, 62, 2, 2009, 231-245.
HARVARD
Davoudi M H. (2009). 'Variation of shear resistance parameters in fine grain soils due to willow roots density', Journal of Range and Watershed Managment, 62(2), pp. 231-245.
CHICAGO
M H Davoudi, "Variation of shear resistance parameters in fine grain soils due to willow roots density," Journal of Range and Watershed Managment, 62 2 (2009): 231-245,
VANCOUVER
Davoudi M H. Variation of shear resistance parameters in fine grain soils due to willow roots density. JRWM. 2009;62(2):231-245 (In Persian).
