Use of Grouting to Control Horizontal Tunnel Deformation Induced by Adjacent Excavation
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 146, Issue 7
Abstract
A grouting technique is introduced as a measure to protect tunnels adjacent to a large-scale excavation. Field measurements indicated that this grouting technique reduced the maximum horizontal displacement in the tunnel from 9.2 to 4.6 mm. Based on this application and two field tests, the following recommendations are proposed: (1) the upper boundary of the grouted zone should be set at or below the tunnel; (2) grouting holes should be installed 3–4 m from the tunnel and at an interval of the length of a tunnel ring along the tunnel axis; (3) in a row of grouting holes, grouting should be conducted at an interval of six to eight holes in a day, and the grout volume per hole should be small, such as ; and (4) when using multiple rows of grouting holes, a far-row-first grouting scheme, in which the grouting sequence progresses toward the tunnel, should be adopted.
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Data Availability Statement
All data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This study was financially supported by the National Key R&D Program of China (Grant 2016YFC0802008), the Natural Science Foundation of Tianjin (18JCQNJC07900), and the National Natural Science Foundation of China (Grant 41630641). This support is gratefully acknowledged.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 146 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 10, 2019
Accepted: Jan 24, 2020
Published online: Apr 25, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 25, 2020
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