Time-Dependent Deformation Mechanism for Swelling Soft-Rock Tunnels in Coal Mines and Its Mathematical Deduction
Publication: International Journal of Geomechanics
Volume 20, Issue 3
Abstract
The floor heave and the inward movement of sidewalls are often encountered in the excavation of tunnels with swelling rock properties. However, the deformation mechanism for swelling soft-rock tunnels cannot be reasonably revealed even now. In this paper, a time-dependent deformation mechanism is investigated in depth and the viscoelastoplastic deformation is obtained using a nonassociated flow rule and the modified Nishihara model. The continuous degradation behaviors of soft rock induced by the intercoupling between the stressed-dilation and the physicochemical swelling is considered based on the humidity field theory and the Zhang three-dimensional (3D) Hoek-Brown yield criterion. The results show that the time-dependent deformation exhibited is unstable in the secondary creep stage and tends to increase inversely with the values of the Zhang 3D Hoek-Brown criterion parameters and the elastic modulus, while it increases directly with the values of the humidity swelling coefficients and the Poisson’s ratio. The substability creep behavior occurs earlier with decreasing the relaxation time. Furthermore, the sensitivity law of incorporated parameters corresponds well with their corresponding physical meaning and practical significance in this study.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request, including the source data for Figs. 4–9.
Acknowledgments
The project was supported by the National Natural Science Foundation of China (Grant Nos. 51774147 and 51679093), the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (Grant No. Z012002), and the Natural Science Foundation of Fujian Province, China (2017J01094).
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©2019 American Society of Civil Engineers.
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Received: Jan 28, 2019
Accepted: Aug 13, 2019
Published online: Dec 20, 2019
Published in print: Mar 1, 2020
Discussion open until: May 20, 2020
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