The study of the mixed mode Ⅰ-Ⅱ fracture damage characteristics of the rock-concrete interface under cyclic loading is essential to grasp the operation of gravity dams under seismic loading. To reveal the mixed mode fracture damage characteristics of the rock-concrete interface under cyclic loading, a four-point shear (FPS) test for rock-concrete specimens was carried out at first. The entire fracture damage process of rock-concrete specimens was monitored in real-time by acoustic emission (AE) and digital image correlation (DIC), the widely used nondestructive monitoring techniques. The mechanical test results show that the modal angle is related to the stiffness decay of rock-concrete specimens. The quantitative identification method of tensile and shear damage based on machine learning algorithm can quantitatively identify the damage types at the interface of rock-concrete specimens. The influence of rock type and modal angle on the interface damage mechanism was quantified by the damage identification method, and the spatial and temporal evolution of tensile and shear damage with cyclic loading was determined. The spatial and temporal evolution characteristics of the damage were compared with the DIC strain contours of the corresponding stages to reveal the mechanism of the influence of the damage evolution law on the crack expansion path.

研究循环荷载作用下岩-混凝土界面混合模式Ⅰ-Ⅱ断裂破坏特性，对于掌握地震荷载作用下重力坝的运行至关重要。为揭示循环荷载作用下岩-混凝土界面的混合模式断裂损伤特征，首先对岩-混凝土试件进行了四点剪切（FPS）试验。采用声发射（AE）和数字图像相关（DIC）等广泛使用的无损监测技术，实时监测岩石-混凝土试样的整个断裂损伤过程。力学试验结果表明，模态角与岩石-混凝土试件的刚度衰减有关。基于机器学习算法的拉剪损伤定量识别方法可以定量识别岩-混凝土试件界面处的损伤类型。通过损伤识别方法量化了岩石类型和模态角对界面损伤机制的影响，确定了循环载荷下拉剪损伤的时空演变规律。将损伤的时空演化特征与相应阶段的DIC应变等值线进行对比，揭示损伤演化规律对裂纹扩展路径的影响机理。并确定了循环载荷下拉伸和剪切损伤的时空演变。将损伤的时空演化特征与相应阶段的DIC应变等值线进行对比，揭示损伤演化规律对裂纹扩展路径的影响机理。并确定了循环载荷下拉伸和剪切损伤的时空演变。将损伤的时空演化特征与相应阶段的DIC应变等值线进行对比，揭示损伤演化规律对裂纹扩展路径的影响机理。