Characterization of constant resistance large deformation cable forces in loess slopes

The use of prestressing anchor cables is already mature in the monitoring and treatment of slopes, but constant resistance large deformation (NPR) cables’ theory and application technology for soil slope reinforcement is still under investigation. In order to explore the anchoring performance of NPR (Negative Poisson Ratio) cables in loess slope, the stress characteristics of NPR cables in loess medium were simulated and analysed by ABAQUS finite element software. First, STATIC and GENERAL quasi-static analysis methods are used to simulate the NPR cable under static tensile conditions. The consistency of its constant resistance deformation characteristics with experimental results found in the literature is verified. Second, the interaction model between the NPR cable coupled with the loess medium is established, and its constant resistance is calculated, about 24.08% larger than the original, while its plastic deformation is reduced by about 37.14%. The compressive stress on the contact surface between NPR cable and loess is concentrated near the free end of the sleeve, and the shear stress on the X-Y plane shows a conjugate symmetry trend. It is proven that the loess is prone to serious damage at the free end. The research results reveal the typical shear failure mechanism of NPR cable in loess medium, which provides an important theoretical basis for prevention of landslides and monitoring of loess slopes.