Abstract Joints are the boundary that controls slope failure of rock slope. Most of the joints are non-persistent and embedded in the rock slope. The creep mechanism of non-persistent joints is of great significance to reveal the creep deformation behavior of the slope over time. However, the embedded non-persistent joints are difficult to sample and to replicate uniformly in large numbers. In the study, a modeling method for embedded non-persistent joints is proposed, and the shear creep test on embedded non-persistent joints was conducted. Based on uniaxial compression testing and shear creep testing, the phase characteristics of creep testing are analyzed, a nonlinear viscous acceleration element and damage variable suitable for structural surfaces are introduced, and a shear-creep-damage constitutive model for non-persistent joints is established. Three-dimensional shear creep constitutive equation is derived using the Laplace transform. Furthermore, Levenberg-Marquardt (L-M) algorithm and global optimization method are used to identify the creep curves and solve the model parameters. After identification and comparison of experimental results and model fitting results, the new constitutive model can clearly reflect the creep characteristics of the non-persistent joints, which provide reference for deformation characteristics of non-persistent joint rock slopes.

中文翻译：

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使用三轴蠕变实验对嵌入式非持久接头的本构行为进行建模和识别

摘要 节理是控制岩质边坡破坏的边界。大多数节理是非持久性的，嵌入在岩石边坡中。非持久节理的蠕变机制对于揭示边坡随时间的蠕变变形行为具有重要意义。然而，嵌入的非持久性关节难以大量采样和均匀复制。在研究中，提出了一种嵌入式非持久性节点的建模方法，并对嵌入式非持久性节点进行了剪切蠕变试验。在单轴压缩试验和剪切蠕变试验的基础上，分析了蠕变试验的相位特性，引入了适用于结构面的非线性粘性加速度元和损伤变量，建立了非持久接缝的剪切蠕变损伤本构模型。使用拉普拉斯变换推导出三维剪切蠕变本构方程。此外，采用Levenberg-Marquardt(LM)算法和全局优化方法识别蠕变曲线并求解模型参数。新的本构模型经过实验结果和模型拟合结果的识别比较，可以清晰地反映非持久节理的蠕变特性，为非持久节理岩质边坡的变形特征提供参考。