Influence of Wavelength-to-Excavation Span Ratio on Dynamic Failure Characteristics of a Deep-Buried Tunnel Subjected to Disturbance
Publication: International Journal of Geomechanics
Volume 22, Issue 10
Abstract
Deep-buried structures are frequently and inevitably subjected to aperiodic perturbation during their life circle, resulting in damage to the rock mass surrounding the structures under the coupled action of excavation-induced local stress and dynamic perturbation. The investigation presented in this paper concentrates on the analytical and numerical dynamic responses around an unsupported deep-buried tunnel subjected to blasting disturbance with different wavelength-to-excavation span ratios (λ/D). Based on the complex function theory, the integral transform and its inversion, the elastic responses around the tunnel are obtained theoretically. Then the corresponding elastoplastic counterparts are explored using a self-developed code: elastoplastic cellular automaton. The analytical results indicate that Poisson’s ratio, the ratio of total time for blasting load to rising time, and λ/D have a significant influence on the distributions of dynamic stress concentration and velocity vibrations. Moreover, the numerical results reveal that tensile failure and the compression–shear counterpart are major damage mechanisms for the rock mass when the wavelength is less than the excavation span, while the compression–shear failure is major damage mechanism when the wavelength exceeds the excavation span. The analytical and numerical results can provide guidance for the support of deep-buried rock tunnels.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (Grant Nos. 42077228, 52125903).
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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: Sep 5, 2021
Accepted: Apr 10, 2022
Published online: Jul 22, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 22, 2022
ASCE Technical Topics:
- Analysis (by type)
- Construction engineering
- Construction methods
- Continuum mechanics
- Damage (material)
- Deformation (mechanics)
- Dynamics (solid mechanics)
- Elastoplasticity
- Engineering fundamentals
- Engineering mechanics
- Excavation
- Failure analysis
- Geomechanics
- Geotechnical engineering
- Materials characterization
- Materials engineering
- Numerical analysis
- Rock masses
- Rock mechanics
- Solid mechanics
- Structural dynamics
- Structural mechanics
- Tunnels
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