Three-Dimensional Centrifuge Modeling of Ground and Pipeline Response to Tunnel Excavation
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 142, Issue 11
Abstract
Tunnel excavation inevitably induces stress changes in the surrounding soil leading to significant ground movements and additional stress in nearby pipelines. Most previous studies simplified tunnel–pipe interaction as a plane strain problem and focused on the case in which the pipeline intersects the tunnel perpendicularly. In this study, centrifuge tests were conducted to investigate the three-dimensional response of the ground and pipeline to tunneling, considering different pipeline orientations with respect to the tunneling direction. When the tunnel face was located within (tunnel diameter) away from the monitoring section, the ground settlement and pipe strain induced were more than 95% of the maximum recorded. When the pipeline intersected the tunnel perpendicularly, the maximum pipe strain always occurred above the tunnel centerline. However, when the pipeline intersected the tunnel at an angle of 60°, the location of maximum pipe strain shifted as the tunnel advanced. The maximum tunneling-induced pipe settlement and strain were up to 20% greater in this case than when the pipeline intersected the tunnel perpendicularly. The pipe settlement and strain may be underestimated if an oblique intersection is simply taken as a perpendicular one.
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Acknowledgments
This work was supported by the Fundamental Research Funds for the Central Universities (Project Numbers 2015B29414 and 2015B25914), and the financial support provided by the Research Grants Council of the HKSAR (Collaborative Research Funding Project Number CityU8/CRF/13G, 8730035 and General Research Fund Project Numbers 16207414 and 16208115).
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 11 • November 2016
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© 2016 American Society of Civil Engineers.
History
Received: May 11, 2015
Accepted: Mar 1, 2016
Published online: Jun 10, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 10, 2016
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