Method to Evaluate the Safety of Tunnels through Steeply Inclined Strata in Cold Regions Based on the Sidewall Frost Heave Model
Publication: Journal of Performance of Constructed Facilities
Volume 32, Issue 4
Abstract
In this paper, safety evaluation for tunnels through steeply inclined strata in cold regions is proposed, for evaluating the safety of lining structures with existing or underlying frost heave damage. Laboratory model tests are performed to investigate the distribution characteristics of the frost heave force that acts on the lining structure, which plays an important role in the assessment of safety. The sidewall frost heave model is determined as the most fitting frost heave model in steeply inclined strata based on the available experimental data. The stress increments under frost heave can be obtained by applying the sidewall frost heave model to numerical simulations. Specifically, the maximum stress in the lining structure mainly includes two parts: the initial maximum stress under self-weight and the stress increment from the frost heave. The safety factor can be calculated through the ratio of the lining material’s strength to the maximum stress in a worst-case scenario. Finally, the practicality of the safety evaluation method is confirmed through an examination of the Balang Mountain tunnel in Southwest China.
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Acknowledgments
The work was supported by the National Natural Science Foundation of China (Grant Nos. 51574201 and 11372257) and the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology) (Grant No. KLGP2015K006). Additional support was provided by the Scientific and Technical Youth Innovation Group (Southwest Petroleum University) (Grant No. 2015CXTD05). We thank the laboratory of Southwest Jiaotong University for providing the experiment conditions.
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Information & Authors
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Published In
Journal of Performance of Constructed Facilities
Volume 32 • Issue 4 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Mar 1, 2017
Accepted: Nov 21, 2017
Published online: Apr 18, 2018
Published in print: Aug 1, 2018
Discussion open until: Sep 18, 2018
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