Remediation of Damaged Shield Tunnel Using Grouting Technique: Serviceability Improvements and Prevention of Potential Risks
Publication: Journal of Performance of Constructed Facilities
Volume 33, Issue 6
Abstract
Shield tunnel damage induced by excessive and differential tunnel displacement has become a major threat to the operational safety of urban subways in China. Grouting offers an effective way to reduce excessive displacement and ensure structural safety of the damaged shield tunnels. In this paper, a case study on the remediation of an operational shield tunnel in Shenzhen, China, by grouting is presented. The drop of the groundwater level caused by nearby foundation excavation was the main reason for tunnel damage. Grouting outside the tunnel was selected considering the site conditions and construction time limitations. An automatic monitoring system for tunnel displacement was installed. The monitored data showed that parameters including the relative tunnel displacement, the horizontal convergence, and the ovality were all reduced after grouting, indicating that the tunnel serviceability was improved. The deformation of the shield tunnel induced by grouting was composed of translation and shape change. The tunnel displacement remained stable when the foundation excavation was resumed. Careful design and real-time adjustment of grouting parameters are key to the successful implementation of the grouting project.
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Acknowledgments
The financial support from the National Natural Science Foundation of China (NSFC Grant Nos. 51778575 and 51338009) is gratefully acknowledged.
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Published In
Journal of Performance of Constructed Facilities
Volume 33 • Issue 6 • December 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 22, 2018
Accepted: Mar 12, 2019
Published online: Aug 23, 2019
Published in print: Dec 1, 2019
Discussion open until: Jan 23, 2020
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