Ground Response to Horizontal Spoil Discharge Jet Grouting with Impacts on the Existing Tunnels
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 146, Issue 7
Abstract
This study presents an application of horizontal spoil discharge jet-grouting (SDJG) columns in soil improvement between the new undercrossing tunnels and the existing tunnels in Changsha, China. To investigate the impact of SDJG construction on the ground and the existing tunnels, the ground pore-water pressure, induced hoop strain, vertical displacement, and rotation of the existing tunnel were monitored. The results indicate that SDJG columns were generally well constructed with an average unconfined compressive strength exceeding 3.50 MPa. Because of the quick discharge of spoils, there was only a slight increase in ground pressure and deformation of existing tunnels during the installation of SDJG columns. The influential range of the SDJG method is much smaller than that caused by pile driving and horizontal twin-jet grouting, and it is similar to that caused by wet deep mixing. SDJG is recommended to improve the area in which adjacent sensitive structures and infrastructures exist because of its reliable effect and minor disturbance to the surrounding ground.
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Data Availability Statement
All data used during the study are available from the corresponding author by request.
Acknowledgments
The present work was carried out with the support of the National Natural Science Foundation of China (Grant Nos. 51878267 and 51938005) and the Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ30006), and the Research program of Changsha Science and Technology Bureau (cskq1703051).
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 146 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jan 11, 2019
Accepted: Feb 5, 2020
Published online: May 7, 2020
Published in print: Jul 1, 2020
Discussion open until: Oct 7, 2020
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