An experimental study of granite fracture micromechanisms during three-point bending based on reconstruction of the seismic moment tensor components for acoustic emission events has been carried out. An original three-stage algorithm for refining and rejecting solutions for the seismic moment tensor of acoustic emission events is proposed, based on a hybrid iterative algorithm and the jackknife resampling method. After the formation of a catalog of acoustic emission events with a stable solution, their mechanisms were analyzed. It is shown that in the case of three-point bending of granite, acoustic emission events are localized in the zone of formation of the future main crack. It has been found that granite bending is accompanied by the formation and development of normal opening cracks with an additional shear component of varying intensity. The kinematics of the found mechanisms of acoustic emission events corresponds to the configuration of loads applied to the sample. The shear component is caused by the microstructural inhomogeneity of the sample. Variations in the orientations of the axes of maximum deviatoric compression (P-axis) and tension (T-axis) are determined, which are associated with the variability of the local stress-strain state of the material near acoustic emission sources. It is shown that the instantaneous magnitudes of acoustic emission events obey the Gutenberg–Richter law.

基于针对声发射事件的地震矩张量分量的重构，进行了三点弯曲过程中花岗岩断裂微机制的实验研究。在混合迭代算法和折刀重采样方法的基础上，提出了一种原始的三阶段完善和拒绝声发射事件地震矩张量解的算法。在建立具有稳定解决方案的声发射事件目录之后，分析了它们的机理。结果表明，在花岗岩三点弯曲的情况下，声发射事件局限在未来主裂纹的形成区域。已经发现，花岗岩的弯曲伴随着正常的开裂的形成和发展，并带有强度变化的附加剪切分量。找到的声发射事件机理的运动学与施加到样品上的载荷的配置相对应。剪切分量是由样品的微观结构不均匀引起的。最大偏向压缩轴的方向变化（确定了P轴和张力（T轴），它们与声发射源附近的材料的局部应力-应变状态的变化有关。结果表明，声发射事件的瞬时幅度符合古登堡-里希特定律。