Ground Reinforcement Method for Closely Spaced Overlapping Tunnels Passing beneath High-Speed Railway Bridge
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 148, Issue 12
Abstract
There is a high risk of ground collapse during the construction of closely spaced overlapping metro tunnels in sensitive environments. When overlapping tunnels pass beneath important structures such as high-speed railway (HSR) bridges whose deformation controlling standard is extremely strict, special ground reinforcement measures should be implemented. This paper investigated stability control measures for closely spaced and overlapping metro tunnels passing beneath the HSR bridge based on the engineering project of the Jinan R1 Metro line in China. The risk sources and engineering difficulties were analyzed. Further, special reinforcement measures including isolation piles and a postgrouting method were proposed. A three-dimensional model was built by a finite element program, and the deformation characteristics of ground and bridge piles were calculated. Subsequently, their deformation characteristics were analyzed and compared with monitoring results. The deformation of an HSR bridge was successfully controlled within permissible value during the shield tunneling process, indicating the effect of ground reinforcement measures is satisfactory.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was financially supported by the Natural Science Foundation of China (Nos. 51774267 and 51974289), and the Youth Innovation Promotion Association CAS (No. 2017377), which are highly acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 148 • Issue 12 • December 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Nov 25, 2021
Accepted: Jul 25, 2022
Published online: Oct 10, 2022
Published in print: Dec 1, 2022
Discussion open until: Mar 10, 2023
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