A creep model based on the damage mechanics is proposed in this study to describe the three-stage creep deformation of rocks under conventional triaxial loading conditions. The proposed model has a simple form as it is based on the mechanism which assumes that the time-dependent creep behavior of rocks is solely described by the damage evolution. Verification of the proposed model against the creep tests shows that the model can reflect the three-stage creep behavior under higher stress levels as well as the elastic behavior under lower stress levels using the same model equations. The features of the proposed model include: (1) Simple mathematical form as it contains only one strain component without strain partitioning, and one set of equations to predict the creep deformation for all stress levels; and (2) The model requires only four parameters. All these features make the proposed model simple to use and easy to implement.

提出了一种基于损伤力学的蠕变模型，描述了常规三轴载荷条件下岩石的三阶段蠕变变形。所提出的模型具有简单的形式，因为它基于这样的机制，即该机制假设岩石的时变蠕变行为仅由损伤演化来描述。对拟议模型进行蠕变测试的验证表明，使用相同的模型方程，该模型可以反映较高应力水平下的三阶段蠕变行为以及较低应力水平下的弹性行为。该模型的特征包括：（1）简单的数学形式，因为它仅包含一个应变分量而没有应变分配，并且具有一组方程式来预测所有应力水平下的蠕变变形；（2）该模型仅需要四个参数。所有这些功能使所提出的模型易于使用且易于实现。