The deep fissured rock mass is affected by coupled effects of initial ground stress and external dynamic disturbance. In order to study the effect of internal flaw on pre-stressed rock mechanical responses and failure behavior under impact loading, intact granite specimens and specimens with different flaw inclinations are tested by a modified split Hopkinson pressure bar (SHPB) and digital image correlation (DIC) method. The results show that peak strain and dynamic strength of intact specimens and specimens with different flaw angles (α) decrease with the increase of axial static pressure. The 90° flaw has weak reduction effect on peak strain, dynamic strength and combined strength, while 45° and 0° flaws have remarkable reduction effect. Specimens with 90° flaw are suffered combined shear and tensile failure under middle and low axial static pre-stresses, and suffered shear failure under high axial static pre-stresses. Specimens with 45° and 0° flaws are suffered oblique shear failure caused by pre-existing flaw under different axial static pre-stresses. Besides, based on digital image correlation method, it is found that micro-cracks before formation of macro fractures (include shear and tensile fractures) belong to tensile cracks. Tensile and shear strain localizations at pre-existing flaw tip for specimen with 45° and 0° flaws are produced much earlier than that at other positions.

深裂隙岩体受初始地面应力和外部动力干扰的耦合作用影响。为了研究内部缺陷对冲击载荷下预应力岩石力学响应和破坏行为的影响，通过改进的霍普金森压力棒（SHPB）和数字图像相关性（DIC）测试了完整的花岗岩样品和具有不同缺陷倾斜度的样品。 ） 方法。结果表明，随着轴向静压力的增加，完整试样和具有不同缺陷角（α）的试样的峰值应变和动强度降低。90°裂纹对峰值应变，动态强度和综合强度的降低作用较弱，而45°和0°裂纹具有明显的降低效果。具有90°裂纹的试样在中，低轴向静预应力下会同时发生剪切和拉伸破坏，而在高轴向静预应力下会发生剪切破坏。带有45°和0°裂纹的试样在不同的轴向静态预应力作用下会因倾斜裂纹而遭受斜向剪切破坏。此外，基于数字图像相关方法，发现在宏观裂缝（包括剪切裂缝和拉伸裂缝）形成之前的微裂缝属于拉伸裂缝。对于存在45°和0°缺陷的试样，在预先存在的缺陷尖端处产生的拉伸应变和剪切应变定位要比在其他位置早得多。带有45°和0°裂纹的试样在不同的轴向静态预应力下会因存在的裂纹而产生斜向剪切破坏。此外，基于数字图像相关方法，发现在宏观裂缝（包括剪切裂缝和拉伸裂缝）形成之前的微裂缝属于拉伸裂缝。对于存在45°和0°缺陷的试样，在预先存在的缺陷尖端处产生的拉伸应变和剪切应变定位要比在其他位置早得多。带有45°和0°裂纹的试样在不同的轴向静态预应力下会因存在的裂纹而产生斜向剪切破坏。此外，基于数字图像相关方法，发现在宏观裂缝（包括剪切裂缝和拉伸裂缝）形成之前的微裂缝属于拉伸裂缝。对于存在45°和0°缺陷的试样，在预先存在的缺陷尖端处产生的拉伸应变和剪切应变定位要比在其他位置早得多。