The development of micro-cracks during damage to rocks affects the propagation of macroscopic cracks on the surface. To explore the crack evolution among pre-existing flaws in rocks, based on the acoustic emission (AE) source location results, the paper analysed the influences of micro-crack development on failure mode. By analyzing AE characteristic parameters, the main controlling factors affecting the development of micro-fractures are determined. The results show that: (1) the development of micro-cracks in rock samples presents a trend of having a high-energy fracture point, the low-energy and small fracture region, the extensive fracture region, and a macroscopic fracture zone. (2) The difference in rock failure mode arises from the influence of rock bridge on the number, location, and extension direction of high-energy fractures, which results in the difference in the formation of main damage zone in rock samples. (3) The total number of micro-cracks, the proportion of shear cracks, and mixed-mode cracks gradually increase with the increase of the rock bridge inclination angle, leading to the gradual evolution of rock samples from simple tensile failure mode to complex crack penetration mode. The variation of the rock bridge inclination angle affects the stress direction of the rock particles at a microscopic level, while it affects the direction of macroscopic crack propagation at a macroscopic level.

岩石损坏期间微裂纹的发展会影响宏观裂纹在表面的传播。为了探究岩石中先前存在的缺陷之间的裂纹演化，基于声发射（AE）源位置结果，分析了微裂纹发展对破坏模式的影响。通过分析声发射特征参数，确定影响微裂纹发展的主要控制因素。结果表明：（1）岩石样品中的微裂纹发展趋势是具有高能断裂点，低能小断裂区，大范围断裂区和宏观断裂带。（2）岩石破坏模式的差异是由于岩石桥梁对高能裂缝的数量，位置和延伸方向的影响，这导致岩石样品中主要破坏带形成的差异。（3）随着岩石桥倾角的增加，微裂纹的总数，剪切裂纹和混合模式裂纹的数量逐渐增加，从而导致岩石样品从简单的拉伸破坏模式逐渐演化为复杂的裂纹。渗透模式。岩桥倾斜角的变化在微观水平上影响岩石颗粒的应力方向，而在宏观水平上影响宏观裂纹扩展的方向。导致岩石样品从简单的拉伸破坏模式逐渐演化为复杂的裂纹渗透模式。岩桥倾斜角的变化在微观水平上影响岩石颗粒的应力方向，而在宏观水平上影响宏观裂纹扩展的方向。导致岩石样品从简单的拉伸破坏模式逐渐演化为复杂的裂纹渗透模式。岩桥倾斜角的变化在微观水平上影响岩石颗粒的应力方向，而在宏观水平上影响宏观裂纹扩展的方向。