Experiment on Effect of Grass Root System on Slope Soil Strength and Disintegration Characteristics

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China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (2) : 234-241.

WANG Gui-yao¹, ZHOU Huan², XIA Yi-qi³, SHA Lin-chuan¹, ZHOU Hong-gui¹

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The erosion resistance of slope plants and slope soil reinforcement usually depended on the enhancement of slope soil strength and its anti-disintegration properties caused by root-soil composites. In order to investigate the influence of grass roots on the strength and anti-disintegration properties of slope soil, ryegrass root growth and its vertical distribution were firstly investigated by dint of the cultivation test and observation. With the direct shear test, the relationship of the strength of root-soil composites, different root content and growth depth for planted roots was obtained. The strength test on root-soil composites with different root content was carried out to compare the strength characteristics of planted and grafted grass roots. In the meantime, disintegration tests on remolded grass-root soil samples and planted grass-root soil samples collected from the highway slope were conducted,and the effect of soil structure and root content on the disintegration characteristics of soil mass was analyzed.The results show that the reinforcement effect of crisscrossing and winding grass roots has significant impact on the enhancement of the strength of root-soil composites. As the capillary root and biological activity exist in the planted grass roots, the reinforcement effect of planted root is far superior to that of grafted root, and the soil strength shows a linear dependence on root content. On account of the reinforcement effect of crisscrossing and winding grass roots, the strength of soil is enhanced, and the pore pressure and closed gas during rainwater infiltration can be reduced by the grass roots in the soil pore penetration.Hence, the grass roots can significantly increase the anti-disintegration properties of the root-soil composites.Due to the structural nature of the cutting slope and a large number of capillary roots derived from the planted main roots, the anti-disintegration properties of original constructional soil are stronger than those of the remolded soil with grafted roots. By replacing grass roots with rice straw in the remolded soil, the strength of root-soil composites and their anti-disintegration properties can be remarkably improved.

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road engineering / slope protection with vegetation / experimental research / grass root / strength and disintegration

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WANG Gui-yao, ZHOU Huan, XIA Yi-qi, SHA Lin-chuan, ZHOU Hong-gui. Experiment on Effect of Grass Root System on Slope Soil Strength and Disintegration Characteristics[J]. China Journal of Highway and Transport, 2018, 31(2): 234-241

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Received	Published
2017-04-06	2018-02-20
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2018-03-20

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