Performance of a Large-Scale Metro Interchange Station Excavation in Shanghai Soft Clay
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 6
Abstract
A 24–33-m-deep cross excavation of a metro interchange station in Shanghai soft clay has been constructed and monitored for 2 years. The excavation area was and supported by diaphragm walls. For construction convenience, the excavation was split into four zones (multiple pits) with varied sizes and depths. On the basis of the interpretation of field monitoring data, the following major findings were obtained: (1) the measured wall deflections and ground settlements were smaller compared with those of similar case histories; (2) both jet-grouting and the geometry of pit played a key role in determining pit performance; (3) the location of maximum wall deflection varied dramatically with excavation depth and displayed three patterns; (4) the measured column uplifts were closely related to excavation depth; and (5) the axial forces of most struts were within 40% of design value, indicating safe for the strut system.
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Acknowledgments
Many organizations and people contributed to the success of this research project. Special thanks are given to Shanghai Shentong Metro Group Co., Ltd., and Shanghai Tunnel Engineering and Rail Transit Design and Research Institute for providing the detailed information about site conditions and field instrumentation. In addition, the comments and suggestions from the three anonymous reviewers and the editors are sincerely appreciated.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 28, 2016
Accepted: Nov 29, 2016
Published online: Feb 15, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 15, 2017
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