Behavior of Overdeformed Shield Tunnel Lining under Grouting Treatment: Field Experiment
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 6
Abstract
Shield tunnel structures are commonly found to be overdeformed in Eastern China soft ground due to adjacent engineering activities. Grouting treatment could serve as a viable solution to actively reduce the excessive diametrical expansion of tunnel linings. However, understanding the grouting-induced effects on adjacent tunnel structures remains preliminary due to the scarcity of well-documented case histories. In this study, a field experiment was conducted to explore a shield metro tunnel’s real performance during grouting treatments. An extensive monitoring scheme was deployed while varied geometrical grouting arrangements were carried out. The tests provided a comprehensive database of the tunnel responses in multiple temporal resolution levels, both during the entire course of the grouting treatment and within single grouting operations. Investigations are carried out over the influencing factors of the grouting efficiency. The experimental observations suggest that grouting efficiency tends to evolve with time and can be affected by various geometrical grouting parameters. Observations are also presented and discussed in detail for the influence of grouting history on the convergence distribution and the tunnel’s performance after the termination of all grouting operations. Time-variant behaviors of the tunnel are depicted in detail, such as the convergence recovery and rebound during the grouting process. Overall, this case study brings new insights into understanding the grouting-induced tunnel lining response. It can also serve as a benchmark for further theoretical and numerical studies.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to acknowledge the financial support provided by the National Key Research and Development Program of China (2020YFC1511900), the Fundamental Research Funds for the Central Universities (2242021k30010), and Transportation Science and Technology Program of Jiangsu Province (2019Y08). The first author would also like to thank Professor Yuchuan Tang in Southeast University for his valuable comments and suggestions for the paper.
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Journal of Performance of Constructed Facilities
Volume 35 • Issue 6 • December 2021
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© 2021 American Society of Civil Engineers.
History
Received: Feb 9, 2021
Accepted: Jul 14, 2021
Published online: Sep 6, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 6, 2022
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