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针对锚固节理岩体在恒定法向刚度（constant normal stiffness,CNS）条件下剪切特性与破坏机制研究不足的问题，基于离散元模拟构建了锚固节理岩体数值模型，开展了系统的数值剪切实验。通过改变法向刚度、结构面粗糙度系数（joint surface roughness coefficient,JRC）、初始法向应力和锚杆弹性模量4个关键参数，探讨其对岩体剪切应力应变特征、法向应力演化、法向位移行为及内力响应的影响。结果表明：法向刚度对剪切应力应变曲线具有多阶段调控作用；JRC与峰值剪切应力呈近似指数关系，并显著影响法向应力的双阶段演化过程及法向位移曲线特征；初始法向应力调控剪切过程中的多阶段强度表现及法向位移的发展时序；锚杆弹性模量对峰值剪切应力具有非线性调控效应，低弹性模量强化效应平缓，高弹性模量则显著提升剪切应力，且其内力响应规律符合Boltzmann模型描述。研究揭示了CNS条件下多因素协同作用对锚固岩体剪切行为的影响机制，为岩土工程中锚固参数的合理选取与稳定性控制提供了理论支撑。
Abstract：The research on the shear characteristics and failure mechanisms of anchored jointed rock masses under constant normal stiffness(CNS) conditions is insufficient currently. A numerical model of anchored jointed rock masses was constructed based on discrete element simulation, and systematic numerical shear experiments were conducted. By varying four key parameters, i. e., normal stiffness, joint surface roughness coefficient(JRC), initial normal stress, and bolt elastic modulus, their effects on the shear stress-strain characteristics, normal stress evolution, normal displacement behavior, and internal force response of the rock mass were explored. The results indicate that normal stiffness exerts a multi-stage regulatory effect on the shear stress-strain curve. JRC exhibits an approximately exponential relationship with peak shear stress and significantly influences the twostage evolution of normal stress and the characteristics of the normal displacement curve. Initial normal stress regulates the multi-stage strength performance during shearing and the development timing of normal displacement. The bolt elastic modulus has a nonlinear regulatory effect on peak shear stress. The strengthening effect of low elastic modulus is gentle, while high elastic modulus significantly enhances shear stress, and its internal force response law conforms to the description of the Boltzmann model. The study reveals the influence mechanisms of multi-factor interactions on the shear behavior of anchored rock masses under CNS boundary conditions, providing theoretical support for the rational selection of anchoring parameters and stability control in geotechnical engineering.
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基本信息:
中图分类号:TU45
引用信息:
[1]朱训国,王天保,张传庆.CNS条件下锚固节理岩体剪切响应与破坏机制研究[J].中国科技论文,2025,20(10):823-834.
基金信息:
国家自然科学基金资助项目(52279116)