采用改进的SHPB试验装置,进行深部岩石的三维高静载频繁动态扰动试验,分析动态应力-应变曲线的一般特征,可将其细分为微裂纹稳定发展、微裂纹非稳定发展、疲劳损伤、疲劳破坏4个阶段进行描述,其中峰值后的2个阶段处于动态应力卸载过程。基于连续因子、应变等效原理及统计损伤理论定义岩石的损伤变量并推演损伤演化方程,采用组合模型法建立岩石的本构模型。结合试验数据,验证岩石的损伤演化规律及建立的本构模型,结果表明:利用推演的损伤演化方程计算出损伤变量,其与动态应变的关系曲线符合试验中岩样的损伤规律;建立本构方程的拟合曲线与试验曲线具有较好的一致性,说明建立的本构模型可以用来预测深部岩石处于三维高静载频繁动态扰动时的动力学特性。 The improved SHPB test device is used to carry out the three-dimensional high static frequent dynamic disturbance test of deep rock. The general characteristics of the dynamic stress-strain curve are analyzed. It can be subdivided into stable development of microcracks, unstable development of microcracks, fatigue damage, fatigue failure Four stages are described, of which two stages after the peak are under dynamic stress unloading process. Based on the theory of continuous factor and strain, and the statistical damage theory, the damage variables of rock are defined and the damage evolution equations are deduced. The constitutive model of rock is established by the combination model method. Combined with the experimental data, the damage evolution law and the established constitutive model of the rock are verified. The results show that the damage variable is calculated by deducing the damage evolution equation and the curve of dynamic strain is in accordance with the damage law of the rock specimen. The fitting curve of the equation is in good agreement with the experimental curve, indicating that the constitutive model can be used to predict the dynamic characteristics of the deep rock under the condition of three-dimensional high static frequent dynamic disturbances.