Evolution of Natural Joints' Mesoscopic Failure Modes under Shear Tests: Acoustic Emission Investigation
Publication: International Journal of Geomechanics
Volume 21, Issue 11
Abstract
Natural joints play an important role in the stability performance of rock engineering. To deeply understand the shear mechanism of natural joints (i.e., tensile fracture or shear fracture), direct shear experiments and acoustic emission (AE) monitoring were carried out for different kinds of joints under five levels of normal stress. By disposing the AE signals during a joint's shear process as AE samples databases, an optimal criterion to identify the tensile fracture and shear fracture modes was established based on the AE parameters, and this method was applied to reveal the shear damage of natural joints under the shear process. The results showed that the shear failure regions of natural joints were localized and inhomogeneous on a joint's surface, and the mesoscopic shear fracture and tensile fracture appeared along all the shearing process of the joint. The moment and the type of failure mode changed with the increase of the normal stress, but the main type of fracture did not change in each period during the whole shearing process, which provided a new way for disaster warning of shear damage.
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Acknowledgments
The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (Nos. U1965205 and 51779251).
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International Journal of Geomechanics
Volume 21 • Issue 11 • November 2021
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© 2021 American Society of Civil Engineers.
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Received: Jul 27, 2020
Accepted: Jun 3, 2021
Published online: Aug 26, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 26, 2022
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