Abstract
A large amount of mineral soil is accumulated to the surface, which is prone to soil erosion and shallow landslides. To improve the stabilization of the dumping site, multi-herb are usually planted in the dumping site to reinforce the soil. To study the reinforcement effect of herbs on the soil and the overall stability of the slope, it is necessary to quantify the soil reinforcement by roots effect of planting multi-herb. In this paper, the species important value is quantitatively analyzed. At the same time, through in situ shear test and Wu–Waldron model (WWM) theoretical calculations, the WWM correction factor is introduced to quantify the reinforcement effect of plant roots and quantify the relative cohesion of each herb in the local area, and then quantify additional cohesion from roots of the reinforcement of multi-herb. The limit equilibrium method is used to calculate the slope safety factor. The species important values of the three herbs are Poa annua L. (186.9%)> Digitaria sanguinalis Scop. (128.6%)> Suaeda glauca Gunge. (84.8%). The average additional cohesion from roots of Digitaria sanguinalis Scop. is the largest (14.7kPa), and the average additional cohesion from roots of Suaeda glauca Gunge. is the smallest (4.5kPa). Three plant WWM correction factors Digitaria sanguinalis Scop. (0.52)> Poa annua L. (0.51)> Suaeda glauca Gunge. (0.17). The relative cohesion of the three plants is Poa annua L. (5.7 ± 1.77kPa)> Digitaria sanguinalis Scop. (4.72 ± 1.46kPa)> Suaeda glauca Gunge. (0.95 ± 0.52kPa), and the root cohesion of multi-herb is 11.383 kPa. The safety factor of the herbs reinforced slope calculated by the limit equilibrium method is 1.913, compared with the bare slope, the safety factor is increased by 3.7%, and the slope stability is improved. This article provides a reference for studying the quantification of the plant root system and slope stability of the slope restoration of multi-herb in the dumping site.
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