露天矿山反倾岩质边坡新型NPR锚索加固机理研究

常规边坡加固结构因无法适应反倾岩质边坡倾倒大变形而失效，导致露天矿山滑坡灾害频发。新型NPR锚索具有延伸率大、强度高、变形均匀等特点，但针对新型NPR锚索的超常力学特性及其对反倾岩质边坡大变形加固机理的研究尚未深入开展。本项目综合运用岩体力学、材料力学、热力学与计算力学等多学科交叉融合方法，开展新型NPR锚索对反倾岩质边坡加固机理的研究。首先，基于静力拉伸试验揭示新型NPR锚索的能量吸收机制，建立静力拉伸作用下的负泊松比力学本构模型。其次，开展物理模型试验探究新型NPR锚索加固后反倾边坡对开挖卸荷的响应特征，揭示新型NPR锚索对反倾岩质边坡的加固机理，建立新型NPR锚索-反倾岩体应力变形互馈作用模型。最后，以物理模型试验为基础，建立新型NPR锚索加固反倾岩质边坡的数值模型，构建反倾岩质边坡新型NPR锚索加固性能仿真分析技术，为露天矿山反倾岩质边坡大变形灾害的加固治理提供理论基础和技术支撑。

Conventional slope reinforced structures fail in anti-dip rock slopes because they cannot adapt to large slope deformation, which leads to frequent landslide disasters in open-pit mines. The novel NPR (Negative Poisson's Ratio) cable has the characteristics of large elongation, high strength and uniform deformation. However, the supernormal mechanical properties of the novel NPR cable and its reinforcement mechanism for large deformation of anti-dip rock slopes has been poorly understood. In this project, the reinforcement mechanism of the novel NPR cable on anti-dip rock slopes will be studied using the interdisciplinary methods of rock mass mechanics, material mechanics, thermodynamics and computational mechanics. Firstly, static tensile tests will be undertaken to study the energy absorption mechanism of the novel NPR cable, and the negative Poisson's ratio mechanical constitutive model will be established. Secondly, physical model tests will be carried out to investigate the response characteristics of anti-dip rock slopes reinforced by the novel NPR cable subjected to excavation-induced unloading. The reinforcement mechanism of the novel NPR cable to the anti-dip rock slopes will be investigated. A new model of stress deformation interaction between the novel NPR cable and anti-dip rock masses will be established. Finally, based on the physical model tests, the numerical models of anti-dip rock slopes reinforced by the novel NPR cable will be established. A new simulation analysis technology of reinforcement performance of the novel NPR cable will be constructed, laying a theoretical basis and technical support for the large deformation disaster reinforcement and treatment of anti-dip rock slopes in open-pit mines.