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Detection of Cracking Levels in Granite by AE Signals Under Uniaxial Compression
https://orcid.org/0000-0001-9341-0145
Abstract Dynamic disasters such as rock bursts are essentially the result of dynamic propagation of cracks in rocks. In order to acquire the characteristics of crack propagation and the evolution of acoustic emissions (AE) signals corresponding to rupture scale, the features of different cracking levels in the time and frequency domains were obtained by uniaxial compression tests equipped with AE instruments. AE signals showed a “sudden increase” and “relative quiet period” before peak strength was reached, indicating that rocks presented features of multilevel progressive crack propagation. The “sudden increase point” corresponded to local large-scale cracks, while energy accumulated through “the relative quiet period” provided the conditions for further expansion of local macroscopic cracks. Cracking levels of granite under uniaxial compression were divided into eight stages in terms of time and frequency. AE signal features of each stage and the three main signals for each cracking levels were revealed. The dynamic evolution relationship between b value and crack propagation levels was obtained at different loading stages. Results provide scientific theoretical guidance for precursory information regarding the failure and prediction of rock bursts.
Detection of Cracking Levels in Granite by AE Signals Under Uniaxial Compression
https://orcid.org/0000-0001-9341-0145
Abstract Dynamic disasters such as rock bursts are essentially the result of dynamic propagation of cracks in rocks. In order to acquire the characteristics of crack propagation and the evolution of acoustic emissions (AE) signals corresponding to rupture scale, the features of different cracking levels in the time and frequency domains were obtained by uniaxial compression tests equipped with AE instruments. AE signals showed a “sudden increase” and “relative quiet period” before peak strength was reached, indicating that rocks presented features of multilevel progressive crack propagation. The “sudden increase point” corresponded to local large-scale cracks, while energy accumulated through “the relative quiet period” provided the conditions for further expansion of local macroscopic cracks. Cracking levels of granite under uniaxial compression were divided into eight stages in terms of time and frequency. AE signal features of each stage and the three main signals for each cracking levels were revealed. The dynamic evolution relationship between b value and crack propagation levels was obtained at different loading stages. Results provide scientific theoretical guidance for precursory information regarding the failure and prediction of rock bursts.
Detection of Cracking Levels in Granite by AE Signals Under Uniaxial Compression
https://orcid.org/0000-0001-9341-0145
Abstract Dynamic disasters such as rock bursts are essentially the result of dynamic propagation of cracks in rocks. In order to acquire the characteristics of crack propagation and the evolution of acoustic emissions (AE) signals corresponding to rupture scale, the features of different cracking levels in the time and frequency domains were obtained by uniaxial compression tests equipped with AE instruments. AE signals showed a “sudden increase” and “relative quiet period” before peak strength was reached, indicating that rocks presented features of multilevel progressive crack propagation. The “sudden increase point” corresponded to local large-scale cracks, while energy accumulated through “the relative quiet period” provided the conditions for further expansion of local macroscopic cracks. Cracking levels of granite under uniaxial compression were divided into eight stages in terms of time and frequency. AE signal features of each stage and the three main signals for each cracking levels were revealed. The dynamic evolution relationship between b value and crack propagation levels was obtained at different loading stages. Results provide scientific theoretical guidance for precursory information regarding the failure and prediction of rock bursts.
Detection of Cracking Levels in Granite by AE Signals Under Uniaxial Compression
Pei, Feng (author) / Ji, Hongguang (author) / Zhang, Tongzhao (author)
2018
Article (Journal)
English
Detection of Cracking Levels in Granite by AE Signals Under Uniaxial Compression
| Online Contents | 2018
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