To further investigate the macroscopic failure law of fractured rock mass, we have performed investigations on the initiation mechanism of microcracks in fractured rock mass from the perspective of micromechanics. The failure of fractured rock mass is essentially due to the accumulation of energy between rock particles to a certain extent, which triggers a series of micro-failure events. In this paper, the theory of moment tensor is introduced to simulate acoustic emission events of rock-like specimens with pre-existing double parallel flaws during the failure process, and the mechanism of micro-failure events and their influence on macro-failure are investigated in depth from the perspective of meso-mechanics. Consequently, a set of macro-micro criteria is established to determine and distinguish the properties and types of cracks. In addition, it is also found that the stress state of rock particles determines the type and propagation direction of cracks. By analyzing the changes in the stress field in the vicinity of cracks, it is feasible to effectively analyze the initiation mechanism of different types of cracks and the trend of further propagation.

为了进一步研究裂隙岩体的宏观破坏规律，我们从微观力学的角度对裂隙岩体中微裂纹的萌发机理进行了研究。裂隙岩体的破坏本质上是由于岩石颗粒之间的能量在一定程度上积聚，这引发了一系列的微观破坏事件。本文介绍了矩张量理论，以模拟破坏过程中预先存在双平行缺陷的岩石样件的声发射事件，并研究了微观破坏事件的机理及其对宏观破坏的影响。从中观的角度深入机械。因此，建立了一套宏观-微观标准来确定和区分裂纹的性质和类型。另外，还发现，岩石颗粒的应力状态决定了裂纹的类型和传播方向。通过分析裂纹附近应力场的变化，有效地分析不同类型裂纹的萌生机理和进一步扩展的趋势是可行的。