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Triaxial Fatigue Behavior and Acoustic Emission Characteristics of Saturated Tuff
The fatigue behavior of water-saturated tuff plays an important role in the safety of many hydraulic engineering projects against earthquakes and blasting. In this study, laboratory tests will be conducted to investigate the mechanical properties and acoustic emission (AE) characteristics of water-saturated tuff under triaxial cyclic compression. The results showed that as the confining pressure increased, microcrack growth inside the specimen was restrained more, the strain that corresponded to the peak stress linearly increased, and the inclination angle of the shear fracture surface changed slightly. The slopes of the residual strain curves of the slightly weathered specimens slowed down first and increased later, and those of the fresh specimens increased continuously. The Hoek–Brown and Mohr–Coulomb failure criteria could forecast the triaxial fatigue strengths of the specimens, and the latter yielded better predictions. The AE characteristics revealed the damage and failure processes in the saturated tuff specimens under triaxial loading–unloading compression. In addition, the onset of the rapid damage stage of the specimens was successfully identified using the damage variables based on elastic modulus, hysteresis energy (DU), and AE signal, respectively.
Triaxial Fatigue Behavior and Acoustic Emission Characteristics of Saturated Tuff
The fatigue behavior of water-saturated tuff plays an important role in the safety of many hydraulic engineering projects against earthquakes and blasting. In this study, laboratory tests will be conducted to investigate the mechanical properties and acoustic emission (AE) characteristics of water-saturated tuff under triaxial cyclic compression. The results showed that as the confining pressure increased, microcrack growth inside the specimen was restrained more, the strain that corresponded to the peak stress linearly increased, and the inclination angle of the shear fracture surface changed slightly. The slopes of the residual strain curves of the slightly weathered specimens slowed down first and increased later, and those of the fresh specimens increased continuously. The Hoek–Brown and Mohr–Coulomb failure criteria could forecast the triaxial fatigue strengths of the specimens, and the latter yielded better predictions. The AE characteristics revealed the damage and failure processes in the saturated tuff specimens under triaxial loading–unloading compression. In addition, the onset of the rapid damage stage of the specimens was successfully identified using the damage variables based on elastic modulus, hysteresis energy (DU), and AE signal, respectively.
Triaxial Fatigue Behavior and Acoustic Emission Characteristics of Saturated Tuff
Wang, Jiajia (author) / Chen, Xudong (author) / Wei, Mingdong (author) / Dai, Feng (author)
2021-09-29
Article (Journal)
Electronic Resource
Unknown
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