[1]WANG Yue,DU Feng,ZHOU Min,et al.Research on Shear Strength of Root-Soil Composite in a Forest and Grass Standing Site in Northern Shaanxi[J].Research of Soil and Water Conservation,2018,25(02):213-219.
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Research on Shear Strength of Root-Soil Composite in a Forest and Grass Standing Site in Northern Shaanxi
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 02
Page number:
213-219
Column:
Public date:
2018-04-03
- Title:
- Research on Shear Strength of Root-Soil Composite in a Forest and Grass Standing Site in Northern Shaanxi
- Keywords:
- roots of mixed forest and grass; slow shear tests; root length density; root surface density; shear strength
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- To further explore the mechanical effects of the soil reinforced by mixed forest and grass in slope protection in Northern Shaanxi, annual plants of Populus simonii Car. and Bothriochloa ischaemum (L.) Keng were selected as the samples. The single tensile tests and slow shear tests were carried out to systematically analyze the single root tensile resistances of Populus simonii Car. and Bothriochloa ischaemum (L.) Keng, and the strength characteristics of root-soil composites of forest and grass. The results indicate that the single root tensile resistances increase with the increase of diameter, and power relations exist between diameter and tensile resistance of the roots of forest and grass, respectively; meanwhile, tensile strength and the diameter of the single root of the forest and grass showed the negative logarithm relations, respectively; especially, when root diameters were less than 0.75 mm, the single root tensile strength of Bothriochloa ischaemum (L.) Keng was much greater than that of Populus simonii Car. under the condition of same root diameter. The internal friction angle φ was logarithmic growth and cohesion c was linear growth with the increase of root length density and root surface area density. These results also show that roots of mixed forest and grass can improve the shear strength in the loess slope in Northern Shaanxi and enhance the slope stability, and this research may have important theoretical implications for future study of exploring high stable slope protection technology of forest-grass integration.
- References:
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1900-01-01