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<p>This study investigates the failure characteristics of waste dump slopes and the reinforcement performance of a constant-resistance, large-deformation anchor cable with a negative Poisson’s ratio (NPR) effect. Utilizing the geological context of the Nanfen No. 2 waste dump, two physical model tests were designed to evaluate slope stabilization strategies, incorporating a new support structure that combines NPR anchor cables with flexible anchor nets. Material parameters for the model were derived from direct shear tests, and an artificial ice-snow layer was integrated to simulate freeze-thaw-induced soil deformation. Distributed optical fibers and tension gauges were deployed to monitor slope behavior during progressive loading, allowing a comparison of reinforcement outcomes between Poisson’s ratio (PR) anchor cables and NPR anchor cables. Experimental results revealed settlement, localized collapse, and various degrees of soil sliding across both models. The NPR-supported system demonstrated superior performance, with 62.5% of NPR cables sustaining deformation without structural failure. The constant-resistance mechanism of the NPR cables was activated at a threshold load increase of 19.5&#xa0;N, achieving a maximum slip displacement of 26&#xa0;mm during the stabilization phase, and absorbing 1.69 times more energy than the PR cables. In contrast, 37.5% of PR cables fractured near their ultimate tensile capacity (at a 26&#xa0;N load). The stress and strain responses of the NPR cables corresponded closely with prior mechanical characterization data, while NPR-supported slopes exhibited significantly reduced failure severity compared to their PR counterparts. The findings validate NPR anchor cables as an effective solution for controlling progressive deformation and long-term stabilization of waste dumps under complex thermo-mechanical loading conditions.</p>

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Study on NPR anchor cable support of dump slope based on physical model test

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Chunhui Cao,
  • Zhigang Tao,
  • Jili Feng,
  • Qiang Dong,
  • Baoping Zou

摘要

This study investigates the failure characteristics of waste dump slopes and the reinforcement performance of a constant-resistance, large-deformation anchor cable with a negative Poisson’s ratio (NPR) effect. Utilizing the geological context of the Nanfen No. 2 waste dump, two physical model tests were designed to evaluate slope stabilization strategies, incorporating a new support structure that combines NPR anchor cables with flexible anchor nets. Material parameters for the model were derived from direct shear tests, and an artificial ice-snow layer was integrated to simulate freeze-thaw-induced soil deformation. Distributed optical fibers and tension gauges were deployed to monitor slope behavior during progressive loading, allowing a comparison of reinforcement outcomes between Poisson’s ratio (PR) anchor cables and NPR anchor cables. Experimental results revealed settlement, localized collapse, and various degrees of soil sliding across both models. The NPR-supported system demonstrated superior performance, with 62.5% of NPR cables sustaining deformation without structural failure. The constant-resistance mechanism of the NPR cables was activated at a threshold load increase of 19.5 N, achieving a maximum slip displacement of 26 mm during the stabilization phase, and absorbing 1.69 times more energy than the PR cables. In contrast, 37.5% of PR cables fractured near their ultimate tensile capacity (at a 26 N load). The stress and strain responses of the NPR cables corresponded closely with prior mechanical characterization data, while NPR-supported slopes exhibited significantly reduced failure severity compared to their PR counterparts. The findings validate NPR anchor cables as an effective solution for controlling progressive deformation and long-term stabilization of waste dumps under complex thermo-mechanical loading conditions.