基于声发射的不同粒径花岗岩细观破裂机理研究

Study on Mesoscopic Fracture Mechanism of Granite with Different Particle Sizes Based on Acoustic Emission

为了研究粒径对岩石细观破裂机制的影响,本文开展了直剪条件下不同粒径花岗岩的声发射试验,结合矩张量反演理论分析岩石微破裂机制。研究结果表明:1在相同应力水平下,随着粒径的增加,微破裂的扩展范围及贯通程度均有增加趋势;2不同粒径花岗岩的微观破裂机制均以剪切型为主比,随着粒径的增大,剪切型占比逐渐升高。以上研究成果有利于增进人们对岩石微观破裂机制及其影响因素的认识,可应用于预测及解释岩石宏观断裂过程及模式。

In order to study the effect of particle size on rock micro-fracture mechanism,this paper takes granite with different particle size as the test object,carries out acoustic emission test under direct shear condition,and determines rock micro-fracture mechanism by combining moment tensor inversion theory.The results show that:1At the same stress level,with the increase of particle size,the extension range of micro-fracture and the penetration degree of micro-fracture before macro-failure have an increasing trend.2The micro-fracture mechanism of granites with different grain sizes is dominated by shear type.With the increase of grain size,the proportion of shear type gradually increases.The above research results are conducive to improving people's understanding of rock micro-fracture mechanism and its influencing factors,and can be applied to predict and interpret macrofracture processes and patterns in rocks.