Influence of Prefabricated Fissure Combinations on Strength and Failure Characteristics of Rock-Like Specimens under Uniaxial Compression
Publication: International Journal of Geomechanics
Volume 23, Issue 2
Abstract
Owing to the uncertainty in the rock formation process, there are different forms of fissure combinations that significantly influence the stability of engineering. In this paper, the peak strength and failure characteristics of rock-like materials with four types of double prefabricated fissure combinations was investigated by combining similar material tests of the digital image correlation (DIC) techniques and discrete-element numerical method (PFC2D). With reference to the experimental observation of crack initiation and propagation, the prefabricated fissure combination effect was analyzed by varying the fissure angle and its combination type. The results indicated that the mechanical properties of the specimen with prefabricated fissures were affected by the fissure inclination angle. When the double fissure inclination angles were 45°, the total fracture length was longest and the peak strength and the proportion of dissipated energy were smallest. It can be obtained that when the fissure inclination angle reached 45°, the effect of the prefabricated fissure combination was maximum. Except for the specimens whose fissure inclination angles had 90° cracks that processed along a perpendicular direction, the cracks of other types propagated and coalesced near the lower side of the middle specimen. The research can provide guidance for controlling engineering disasters involving complex fissure combinations under natural geological conditions.
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Acknowledgments
The research described in this paper is financially supported by the Zhejiang University of Technology. The authors are grateful to the financial support from the National, Natural Science Foundation of China (No. 51679215), and from the Science Technology Department of Zhejiang Province (LGF21E090005).
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 23 • Issue 2 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 1, 2022
Accepted: Aug 11, 2022
Published online: Nov 21, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 21, 2023
ASCE Technical Topics:
- Analysis (by type)
- Construction engineering
- Construction industry
- Construction management
- Continuum mechanics
- Cracking
- Engineering fundamentals
- Engineering mechanics
- Failure analysis
- Fracture mechanics
- Material failures
- Material mechanics
- Material properties
- Material tests
- Materials characterization
- Materials engineering
- Numerical analysis
- Offsite construction
- Solid mechanics
- Strength of materials
- Tests (by type)
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