Analytical Approach for Evaluating the Dynamic Self-Bearing Capacity of Tunnels
Publication: International Journal of Geomechanics
Volume 21, Issue 8
Abstract
The self-bearing capacity of tunnels possesses a dynamic evolution process. However, there is a limited advanced knowledge to evaluate the dynamic self-bearing capacity of tunnels quantitatively. In this paper, the time-dependent self-bearing factor of the tunnel surrounding rock is proposed, and an analytical approach for the circular excavations is developed. In this paper, the rock mass is regarded as a viscous material with a distinguishable strain-strengthening property. The stress states around circular excavations are determined using the Drucker–Prager criterion and the power-hardening constitutive model. Then, the Burger-creep viscoplastic model is introduced to evaluate the time-dependent deformations. Finally, the formula of a time-dependent self-bearing factor of tunnels is obtained. The sensibilities of time-dependent self-bearing factor and time-dependent deformation of tunnels to the incorporated model parameters are investigated in depth. Effects of incorporated model parameters on time-dependent self-bearing factor and time-dependent deformation of tunnels are consistent with their physical meanings. This paper provides an analytical approach for quantitatively evaluating the dynamic evolution process of the self-bearing capacity of tunnels.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 51874144 and 51679093) and the Scientific and Technology Plan Projects in Xiamen (No. 3502z20193040).
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Published In
International Journal of Geomechanics
Volume 21 • Issue 8 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jul 17, 2020
Accepted: Mar 8, 2021
Published online: May 20, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 20, 2021
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