Experimental and theoretical investigation on the stability of deep excavations against confined aquifers in Shanghai, China

Urban development often requires deep excavations, such as for deep basements, cut-and-cover tunnels, and underground transportation systems. Pressure from a confined aquifer can cause a sudden failure of a deep excavation and have disastrous effects on the surrounding buildings. In this study, a se...

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Bibliographic Details
Published in:KSCE journal of civil engineering 2016, 20(7), , pp.2746-2754
Main Author: Sun, Yu-yong
Format: Article
Language:English
Subjects:
Aquifers
Aquitards
Basements
Civil Engineering
Confined aquifers
Dredging
Engineering
Excavation
Failure
Geotechnical Engineering
Geotechnical Engineering & Applied Earth Sciences
Industrial Pollution Prevention
Mathematical analysis
Model testing
Piping
Reliability analysis
Sand
Stability analysis
Transportation systems
Tunnel construction
Urban development
Urbanization
토목공학
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Summary:Urban development often requires deep excavations, such as for deep basements, cut-and-cover tunnels, and underground transportation systems. Pressure from a confined aquifer can cause a sudden failure of a deep excavation and have disastrous effects on the surrounding buildings. In this study, a series of centrifugal model tests were conducted on different aquitards in Shanghai to investigate the failure process and types. Two types of failure were identified from the centrifugal model tests: local failure (sand piping and sand boiling) and general upheaval. An approach to the stability analysis of deep excavation against a confined aquifer was developed. To increase the reliability of the analytical approach, the calculated results were compared with the experimental results. The results showed good agreement.
ISSN:1226-7988
1976-3808
DOI:10.1007/s12205-016-0488-3