Root reinforcement effect of three ecological slope protection plants
This study aimed to examine the soil stabilization and slope protection effects of different plant roots.Triaxial compression tests were conducted on undisturbed soil samples containing roots,and single-root tensile tests were conducted on individual plant roots.The strength characteristics of herbaceous plant roots and soil under different parameter conditions were explored using function fitting and finite element analysis methods.The study findings were as follows:(1)the shear process of undisturbed soil exhibited strain-hardening characteristics,and a significant correlation was observed between the shear strength index and the root content.Among plant species with similar root depth or root content,the root-soil complex of Kummerowia striata demonstrated the highest shear strength.(2)A highly significant correlation was observed between root diameter and root depth with tensile mechanical performance indicators.When root diameter or root depth was kept constant,the root system of Kummerowia striata significantly outperformed the other two plants on the ultimate stress,strain and elastic modulus,suggesting a better deformation resistance.(3)Under similar root content and consistent root depth conditions,Kummerowia striata exhibited the highest slope safety coefficient.The results of this study can serve as a valuable reference for selecting plant species for ecological slope protection in the Taihang Mountains region and also provide strong support for ecological slope design,shallow landslide prevention,and soil erosion control.
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