The dynamic mechanical properties and fracture process of rock materials with pre-existing flaws are crucial for explaining the failure mechanisms of deeply buried constructions. To investigate the mechanical properties and fracture behavior of flawed granite subjected to dynamic loading, dynamic experiments were conducted on granite specimens by using a split-Hopkinson pressure bar test system. The effects of strain rate and flaw inclination angle on granite strength and deformation properties were investigated. The white patch initiation, micro-crack propagation, and failure mode were analyzed using a high-speed camera and digital image correlation technology. The fracture mechanism was revealed by quantitatively analyzing the localized strain field and fractal features. The results demonstrated that the dynamic strength and deformation of the flawed specimen compared to an intact specimen had more obvious strain rate effects. The development of white patches determined the direction and path of crack propagation. The fracture process and shear-tensile failure mode were closely correlated with the evolution of the strain field. Furthermore, the fractal characteristics indicated that a larger fractal dimension resulted in a more complex fracture distribution and mixed failure modes. These results provide a reference for the construction design and safety control of deep rock engineering.

预先存在缺陷的岩石材料的动态力学性能和断裂过程对于解释深埋构造的破坏机理至关重要。为了研究有缺陷的花岗岩在动态载荷下的力学性能和断裂行为，使用分体式霍普金森压力棒测试系统对花岗岩样品进行了动态实验。研究了应变率和缺陷倾角对花岗岩强度和变形性能的影响。使用高速相机和数字图像关联技术分析了白色斑块的起爆，微裂纹传播和失效模式。通过定量分析局部应变场和分形特征揭示了断裂机理。结果表明，与完整试样相比，缺陷试样的动强度和变形具有更明显的应变率效应。白色补丁的发展决定了裂纹扩展的方向和路径。断裂过程和剪切拉伸破坏模式与应变场的演变密切相关。此外，分形特征表明，较大的分形维数导致更复杂的裂缝分布和混合破坏模式。这些结果为深岩工程的施工设计和安全控制提供了参考。断裂过程和剪切拉伸破坏模式与应变场的演变密切相关。此外，分形特征表明，较大的分形维数导致更复杂的裂缝分布和混合破坏模式。这些结果为深岩工程的施工设计和安全控制提供了参考。断裂过程和剪切拉伸破坏模式与应变场的演变密切相关。此外，分形特征表明，较大的分形维数导致更复杂的裂缝分布和混合破坏模式。这些结果为深岩工程的施工设计和安全控制提供了参考。