Study on Acoustic Emission Characteristics and Damage Evolution of Shale under Uniaxial Compression

In this study, uniaxial compression tests were conducted and acoustic emission monitoring technology was used on shales from the Liutang Village, Shizhu County, Chongqing City. The ringing count and energy evolution law during the compression process of shale samples were analyzed, and their damage evolution characteristics are discussed. The results show that the cumulative ringing count and cumulative energy curves of acoustic emission can be used to distinguish among crack closure, stable crack propagation, and unstable crack propagation. According to the change process of acoustic emission events, the damage evolution process of shale samples is divided into damage maintenance, initiation, and acceleration. The constitutive model established based on the acoustic emission ringing count can better describe the uniaxial compression process of shale samples.