Acoustic Emission and Failure Modes of Rock Under Deep High-Stress Cyclic Disturbance

• Published in: Geotechnical and geological engineering Vol. 43; no. 6
• Main Authors: Yang, Dongjie, Hu, Jianhua, Dong, Lili, Zhao, Fengwen
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.08.2025
• Subjects: Civil Engineering; Earth and Environmental Science; Earth Sciences; Geotechnical Engineering & Applied Earth Sciences; Hydrogeology; Original Paper; Terrestrial Pollution; Waste Management/Waste Technology; Energy evolution; Failure mode; Damping characteristics; Multi-level constant amplitude cyclic loading; Deep engineering
• ISSN: 0960-3182; 1573-1529
• DOI: 10.1007/s10706-025-03258-0

Deep engineering projects are subject to complex environmental stress disturbances, their safety and stability urgently need to be studied. This study designed experiments on granite subjected to multi-level constant amplitude cyclic loading under different confining pressures, as well as uniaxial recompression experiments on pre-damaged granite. The results indicate that there are significant differences in the axial strain, radial strain, and volumetric strain under low and high confining pressures. When the confining pressure is constant, with the increase of the number of cyclic loadings, the evolution trends of the axial damping ratio, radial damping ratio, axial damping coefficient, and radial damping coefficient of granite are consistent. The evolution pattern of the b-value for damaged granite is similar to that of natural granite, showing a sudden drop during failure. The crack propagation in natural granite is dominated by tension-tension-mixed-shear modes, while in damaged granite under confining pressures of 10 and 30 MPa, the crack propagation is primarily tension-tension-tension-tension modes. Under a confining pressure of 50 MPa, the crack propagation in damaged granite is dominated by tension-tension-mixed-tension modes, and under 80 MPa confining pressure, the crack propagation in damaged granite is primarily tension-mixed-shear-mixed modes.