Using Grouting of Shield Tunneling to Reduce Settlements of Overlying Tunnels: Case Study in Shenzhen Metro Construction
Publication: Journal of Construction Engineering and Management
Volume 138, Issue 4
Abstract
Grouting control of shield tunneling is of paramount importance to reduce settlements of existing tunnels below-passed by shield tunneling along a curved alignment and in crowded urban areas. The methodology and scheme of the grouting control of shield tunneling is illustrated taking the first Earth Pressure Balanced (EPB) shield below-crossing existing interval tunnels from Kexueguan station to Dajuyuan station of the Shenzhen metro line No. 1, for example. A combination methodology of the “observational method” and the “predefined design method” was set up to deal with parameters concerning the grouting control of shield tunneling. Some parameters of the grouting control were predefined or suggested before the below-crossing, and other parameters might be adjusted during construction on the basis of the “observational method.” The scheme primarily consists of preparation work before the below-crossing, automatic motoring system used in operation tunnels, simultaneous backfilling grouting and grouting directly through segment holes. For the simultaneous backfilling grouting, enough grouting was filled in the tail void with shield advance. With the help of automatic motoring system, the grouting directly through segment holes was employed in light of the measured settlements of existing tunnels. The maximum of the final measured settlements of existing tunnels is about 70% of the predefined allowable settlement of 20 mm, which shows that the grouting control of shield tunneling is effective in reducing settlements of existing tunnels. The grouting practice can be used as references in similar conditions.
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Acknowledgments
This support from the Special Fund of Beijing Jiaotong Univ. of China (2011JBM076) and the National Natural Science Foundation of China (No. 50978017 51008015) is acknowledged. Furthermore, the authors are grateful to the two reviewers for their constructive comments.
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© 2012. American Society of Civil Engineers.
History
Received: Apr 25, 2011
Accepted: Jul 28, 2011
Published online: Mar 15, 2012
Published in print: Apr 1, 2012
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