The mechanical behavior and constitutive relation of rock joints have caught more and more attention in the field of geotechnical engineering. The disturbed state concept (DSC) theory offers a powerful tool for building a constitutive model to interpret the mechanical response of geomaterials. In this paper, a new constitutive model for joint shear deformation was developed based on the DSC theory. The characteristics of quasi-elastic phase, pre-peak hardening phase, peak shear strength, post-peak softening phase and residual strength during the whole process of joint shear deformation are considered in this model. In the framework of this shear constitutive model, the rock material was assumed to consist of two kinds of micro-units with different mechanical responses, namely the relatively intact unit and the fully adjusted unit. Subsequently, the DSC theory was used to connect the mechanical behavior of micro-units with the macroscopic joint shear deformation characteristics, and a disturbance factor was introduced to reveal the disturbed state evolution process inside the rock. In addition, the proposed DSC model was simple in form, less in parameters and reasonable in physical meaning. The model was cross-validated by experimental data of different kinds of natural joints and artificial joint replicas. Finally, the model is compared with existing models, and the model effectiveness is quantitatively evaluated through statistical indicators. The values of R² are greater than 0.9, and the AAREP and RMSE of the proposed DSC model are closer to 0 than those of other models. The research results can provide a valuable reference for further understanding of shear deformation mechanism.

岩石节理的力学行为和本构关系越来越受到岩土工程领域的关注。扰动状态概念 (DSC) 理论为构建解释岩土材料力学响应的本构模型提供了强大的工具。在本文中，基于 DSC 理论开发了一种新的节理剪切变形本构模型。该模型考虑了节理剪切变形全过程的准弹性相、峰前硬化相、峰值抗剪强度、峰后软化相和残余强度等特征。在该剪切本构模型的框架下，假设岩石材料由两种具有不同力学响应的微单元组成，即相对完整的单元和完全调整的单元。随后，利用DSC理论将微观单元的力学行为与宏观节理剪切变形特征联系起来，引入扰动因子揭示岩石内部的扰动状态演化过程。此外，所提出的DSC模型形式简单，参数少，物理意义合理。该模型通过不同种类的天然关节和人工关节复制品的实验数据进行交叉验证。最后将模型与现有模型进行对比，通过统计指标对模型有效性进行量化评价。R 的值 引入扰动因子揭示岩石内部的扰动状态演化过程。此外，所提出的DSC模型形式简单，参数少，物理意义合理。该模型通过不同种类的天然关节和人工关节复制品的实验数据进行交叉验证。最后将模型与现有模型进行对比，通过统计指标对模型有效性进行量化评价。R 的值 引入扰动因子揭示岩石内部的扰动状态演化过程。此外，所提出的DSC模型形式简单，参数少，物理意义合理。该模型通过不同种类的天然关节和人工关节复制品的实验数据进行交叉验证。最后将模型与现有模型进行对比，通过统计指标对模型有效性进行量化评价。R 的值 通过统计指标对模型有效性进行量化评价。R 的值 通过统计指标对模型有效性进行量化评价。R 的值²大于 0.9，所提出的 DSC 模型的 AAREP 和 RMSE 比其他模型更接近 0。研究结果可为进一步认识剪切变形机理提供有价值的参考。