Abstract：[Background] The root system is the organ that directly contacts with the soil and has the function of supporting the plant and fixing the soil. In karst area, the soil layer is shallow, the soil erosion is serious, and the ecological environment is poor. With the development of economy, climate change, debris flow, landslides and other natural disasters occur frequently, the stability of slope soil has aroused widespread concern.[Methods] In order to study the mechanical characteristics of slope greening shrubs in karst area,taking 4-year-old Cassia bicapsularis and Indigofera amblyantha as the research objects, the root diameters were divided into four grades. Under the loading rate of 100 mm/min, the friction test between the root and soil was carried out by using a single root vertical pull-out method. The effects of root length, root surface interaction and root length on the soil were investigated. The soil bulk density and water content were 1.43 g/cm3 and 17.15%.[Results] 1) The root bark surface of C. bicapsularis had dense longitudinal cracks and formed notches, while the root bark surface of I. amblyantha was scaly. The root-soil friction coefficient of C. bicapsularis was higher than that of I. amblyantha, the root system of C. bicapsularis had better ability of strengthening soil strength and resisting deformation and failure than that of I. amblyantha. 2) In the process of friction between single drawing and soil interface, the characteristic curve of force displacement relationship experienced three stages:viscous friction stage, debonding friction stage and bonding friction stage.3) The friction force between the roots and soil of C. bicapsularis and I. amblyantha increased with the increase of burial depth. The longer the extension of vegetation roots in soil, the greater the role of force. 4) The root diameter of C. bicapsularis and I. amblyantha showed a significant positive correlation with their maximum friction, while with the change of diameter, there was no significant difference in the friction per unit area.[Conculsions] That is to say, the force released by a single root of C. bicapsularis in the pull-out friction test was greater than that of the latter, and it was better to enhance the soil strength and resist the deformation and failure. Therefore, it is suggested that C. bicapsularis should be used as vegetation slope protection. The results provide a theoretical basis for the selection of greening tree species, soil consolidation mechanism and prevention of shallow landslide in the study area.
郭欢, 陈龙, 唐丽霞, 潘露, 阮仕航. 喀斯特区2种护坡灌木单根拉拔摩擦试验[J]. 中国水土保持科学, 2022, 20(1): 128-135.
GUO Huan, CHEN Long, TANG Lixia, PAN Lu, RUAN Shihang. Experimental study on the pull-out friction of two kinds of slope protection shrubs in karst area. SSWC, 2022, 20(1): 128-135.
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