Effects of temperature and confining pressure on energy evolution characteristics and rock burst mechanism in brittle rocks
Date
2022
Authors
Akdag, S.
Karakus, M.
Nguyen, G.D.
Taheri, A.
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Conference paper
Citation
Proceedings of the 27th International Mining Congress and Exhibition of Turkey, 2022, pp.298-304
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Akdag S., Karakus M., Nguyen G.D., Taheri A.
Conference Name
International Mining Congress and Exhibition of Turkey (IMCET) (22 Mar 2022 - 25 Mar 2022 : Antalya, Turkey)
Abstract
The aim of this research is to study the energy evolution characteristics of brittle rocks and understand the effects of temperature and confinement on bursting mechanism. A new method based on post-peak energy characteristics and acoustic emission response obtained from a series of uniaxial and triaxial compression tests is developed for rock burst analysis on granite samples exposed to high temperature. The axial loading is controlled using the feedback from lateral strain to obtain snap-back behaviour that is associated with energy evolution and the material response under self-sustaining failure. For each loading scenario, excess strain energies are calculated. The elastic strain energy, energy consumed by dominant cohesion weakening, and energy dissipated during mobilisation of frictional loss are quantified. The experimental results underlined that the amount of accumulated elastic strain energy increases as the confinement increases, resulting in a large potential for rock burst. It was also observed that the dominant failure pattern of granite changes from multiple longitudinal splitting to a single shear fracture and finally to multiple conjugate shear fractures as the level of temperature and confinement increases. Thermally induced damage causes less strain energy accumulation and hence the excess strain energy decreases (by ~43% compared to the room temperature conditions) with increasing temperature.
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