黄土高原刺槐根土复合体单剪特性及形变模型研究OA

The superimposed effects of extreme rainfall events and engineering disturbances in the Loess Plateau have led to a significant increase in the risk of shallow loess landslides.This situation reveals the engi-neering governance contradiction of"ecological improvement vs.disaster intensification"in ecological restora-tion projects.This study focuses on the mechanical properties of the root-soil interface of Robinia pseudoacacia.Through methods including in-situ testing,single shear test,and theoretical analysis,we systematically quanti-fied the multi-field coupling effects of moisture content fluctuations,root topological types,and variations in root content on the shear strength evolution of the root-soil interface.The results indicate:① Vegetation roots in the shear strength characteristics of the root-soil interface.The shear process can be divided into three stages:initial linear elastic deformation,damage accumulation,and progressive failure.② The stress-strain curves of the root-soil interface can be categorized into softening and hardening types,with the softening type comprising a strength-increasing phase followed by a strength-decaying phase.③ A predictive model considering the stress-strain softening of the root-soil interface was proposed,demonstrating favorable predictive performance.This re-search provides essential data and theoretical support for ecological restoration in rapid slope stability assess-ments that incorporate vegetation factors.