Excavation of Middle Huai-Hai Road Station of Shanghai Metro Line 13: Challenges, Risks, Countermeasures, and Performance Assessment
Publication: Practice Periodical on Structural Design and Construction
Volume 22, Issue 3
Abstract
This paper reports on the construction of a 31.4- to 33.1-m-deep subway station in Shanghai, China. This underground transit project was complicated further by the in situ hydrogeological condition, congested construction environment, and additional side-by-side deep excavations for other underground facilities. To protect the urban environment, challenges of this project, including potential risks, were evaluated in advance, and corresponding countermeasures to cope with potential risks were considered in the design and construction. To achieve the best project performance and verify design and construction considerations, a long-term field instrumentation program that lasted from May 2012 to April 2016 was implemented to monitor performance of the subway station pit and the adjacent ground and superstructures. Field data revealed that displacements of earth-retaining structures and the ground were within the local deformation control criteria. With the exception of a local leaking accident, no through-wall-seepage flow, piping, sand boiling, soil flow, rupture of pit base, or hydraulic uplifting of basal soils took place during the construction. The monitored cumulative settlements of adjacent buildings exceeded the specified criterion, but most buildings underwent only rigid tilt settlements and were rarely damaged. Experiences and lessons learned from this project will be useful for future design and construction of deeply buried infrastructures in densely populated cities.
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Acknowledgments
Financial support from the National Basic Research Program (973 Program) (Grant 2015CB057800), the National Natural Science Foundation of China (Grant NSFC 41672269), the National Key Research and Development Plan (Grant 2016YFC0800204), and the Natural Science Foundation of Shanghai (Grant 16ZR1411900) is gratefully acknowledged. The great comments and suggestions from the anonymous reviewers and the editor are sincerely appreciated.
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Published In
Practice Periodical on Structural Design and Construction
Volume 22 • Issue 3 • August 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Aug 26, 2016
Accepted: Dec 1, 2016
Published online: Feb 22, 2017
Discussion open until: Jul 22, 2017
Published in print: Aug 1, 2017
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