Performance of a Zoned Excavation by Bottom-Up Technique in Shanghai Soft Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 144, Issue 11
Abstract
This paper investigates a basement excavation adjacent to running metro tunnels and underground pipelines in Shanghai soft soil. The zoned excavation technique was adopted to control the deformations caused by excavation. The excavation site was divided into three parts and successively constructed in the order of Zones A, B, and C with the bottom-up method. The field data of retaining walls, struts, columns, surrounding ground, pipelines, and metro tunnels were monitored and analyzed in terms of lateral and vertical deformations throughout the whole construction process. The data indicates that the wall deflection and column heave in Zones B and C were smaller than those in Zone A. The ground surface settlements near the metro lines were effectively reduced by the zoned excavation technique. The deformations of the metro tunnels and pipelines were well controlled within the acceptable limits. A general relation between wall deflection and the excavation area was also proposed based on this and 15 similar cases.
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Acknowledgments
The authors are grateful for the support provided by the National Natural Science Foundation of China (Grant No. 41272288) for this research work.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 144 • Issue 11 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 3, 2017
Accepted: May 17, 2018
Published online: Sep 13, 2018
Published in print: Nov 1, 2018
Discussion open until: Feb 13, 2019
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