Thermal Infrared Precursor Information of Rock Surface during Failure Considering Different Intermediate Principal Stresses

Rock failure generally leads to serious consequences, and it is significant obtain the precursor information prior using associated techniques. Thus, essential acquire probe relevant information. In this study, true triaxial tests are performed on red sandstone specimens under varying intermediate principal stress conditions. The thermal infrared image evolution temperature-induced change characteristics of rock also analyzed imaging technology. addition, with assistance a high-speed photography technique, these during compression unloading processes systematically investigated determine how impacts image, temperature, fracture propagation. Finally, mechanism summarized, non-contact indicator proposed, which can give advance notice collapse before abnormal temperature change. results show that there exist precursors, rapid development macroscopic cracks failure. Abnormal images changes. As increases, abnormalities will accordingly. Both changes anomalous patches be utilized as collapse, specific precursors preliminarily determined in time space. Our function frame reference for analysis prevention due sudden instability.