Brittleness Effect on Acoustic Emission Characteristics of Rocks Based on a New Brittleness Evaluation Index
Publication: International Journal of Geomechanics
Volume 22, Issue 10
Abstract
Brittleness has an important effect on the deformation and failure behavior of rocks. In this study, a brittleness evaluation index (Bp) based on the prepeak stress–strain curves of rock was proposed, and its effectiveness was verified by triaxial and uniaxial compression tests on different types of rocks. Based on the newly proposed index, the brittleness effect on the acoustic emission (AE) characteristics, such as the AE b-value, AE energy, average frequency (AF), and the ratio of the rise time to the peak amplitude (RA) of rocks under uniaxial loading was analyzed. The results show that the Bp has a linear negative correlation with the AE b-value. The stronger the brittleness of the rock, the smaller the AE b-value and the higher the ratio of macro to microcracks generated during rock failure. The brittleness effect on the variation law of the AE b-value is reflected during unstable crack propagation. In addition, rock brittleness affects the AF value but had no obvious influence on the RA value. The more brittle the rock is, the higher the proportion of tensile cracks in the fracture process. The research results could further enrich the evaluation system for rock brittleness and contribute to a better understanding of rock damage.
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Acknowledgments
We gratefully acknowledge financial support from the National Natural Science Foundation of China (Grant Nos. 51709113, 51704097), Key Research and Development Program of Henan Province, China (Grant No. 222102320141), and the Science Foundation of Henan Polytechnic University (J2021-2).
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Published In
International Journal of Geomechanics
Volume 22 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 4, 2021
Accepted: Jun 4, 2022
Published online: Jul 29, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 29, 2022
ASCE Technical Topics:
- Acoustics
- Air pollution
- Analysis (by type)
- Brittleness
- Continuum mechanics
- Cracking
- Detection methods
- Emissions
- Engineering fundamentals
- Engineering mechanics
- Environmental engineering
- Failure analysis
- Fracture mechanics
- Geology
- Geotechnical engineering
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Methodology (by type)
- Pollution
- Rocks
- Solid mechanics
- Tests (by type)
- Triaxial tests
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