Investigating Dynamical Stress Adjustment Induced by Transient Excavation in a Deep-Buried Tunnel
Publication: International Journal of Geomechanics
Volume 24, Issue 10
Abstract
Solutions for unloading stress waves in the continuous medium are widely applied to analyze the transient effect of excavation unloading in deep-buried tunnel engineering. This paper explores a semianalytic model for studying dynamic stress adjustments during transient excavation unloading in deep underground tunnels. The model employs finite time steps and toroidal elements on temporal and spatial scales, utilizing an iterative algorithm for dynamic response calculation. Griffith and Mohr–Coulomb strength criteria are introduced to calculate the difference in the critical generalized additional stress. This difference classifies stress adjustment paths into crack–shear (crack first and then shear) and shear models (shear only). Updated discontinuous boundaries are considered in the cracked element. Investigating the effects of unloading duration and initial in situ stress on dynamic response, a stress release index is realized to quantify the dynamic stress adjustment. Shorter unloading durations lead to more pronounced stress fluctuations, and higher stress release aggregation results in smaller plastic zones. Positive correlations between initial in situ stress and response characteristics are observed, resembling triaxial unloading test results. The model proposed in this paper enhances the understanding of the failure mechanism in the unloading process for deep hard rocks in underground engineering.
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Data Availability Statement
All data, models, and codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study is sponsored by the National Natural Science Foundation of China (Grant Nos. 42177158 and 11902249), the Key Research and Development project of Shaanxi Province (No. 2022SF-412), and the Education Bureau of Shaanxi Province in China (Grant no. 20JS093), the Opening Fund of the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology (Grant no. SKLGP2022K005), and the Open subject of Urban Geology and Underground Space Engineering Technology Research Center of Shaanxi Province (2022KT-01). The financial support provided by this sponsor is greatly appreciated.
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Published In
International Journal of Geomechanics
Volume 24 • Issue 10 • October 2024
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© 2024 American Society of Civil Engineers.
History
Received: Nov 29, 2023
Accepted: Apr 4, 2024
Published online: Jul 23, 2024
Published in print: Oct 1, 2024
Discussion open until: Dec 23, 2024
ASCE Technical Topics:
- Construction engineering
- Construction methods
- Continuum mechanics
- Cracking
- Dynamic models
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Excavation
- Fluid dynamics
- Fluid mechanics
- Fracture mechanics
- Geotechnical engineering
- Hydraulic engineering
- Hydrologic engineering
- Material mechanics
- Materials engineering
- Models (by type)
- Shear stress
- Solid mechanics
- Stress (by type)
- Stress waves
- Structural analysis
- Structural engineering
- Transient response
- Tunnels
- Water and water resources
- Waves (mechanics)
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