Abstract
One issue of particular concern in construction of shield-driven tunnels beneath the Qiantang River is the evaluation of impacts of changes in river stage on serviceability and structural soundness of the tunnels in the long run. During construction of the Qiantang River Tunnel, four typical cross-sections of the tunnel linings were instrumented with total earth pressure cells and reinforcement strain gauges, embedded during precasting of the concrete segments, to measure the tunnel responses to changes in river stage during operation. This paper analyzes the field-measured total earth pressures acting on the tunnel linings and strains of the steel bars embedded within the segments and explores their correlations with river stage of the Qiantang River. Based on the field observations, a calculation model taking variations of river level with time into account is proposed to predict the total earth pressures acting on the tunnel lining situated beneath the Qiantang River.
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Acknowledgments
The authors appreciate help from the staff of the Hangzhou Qing-chun Road Cross-river Tunnel Company Ltd., during instrumentation set-up and data acquisition. This study is sponsored by Opening Funds of Key Laboratory of Geotechnical and Underground Engineering (Tongji University) of Ministry of Education (KLE-TJGE-B1402), K. C. Wong Magna Fund in Ningbo University, and Talent Project of Ningbo University (No. ZX2014000818).
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Lin, C., Wu, S., Xia, T. et al. Observed response of a shield-driven tunnel to fluctuations in river stage. Environ Earth Sci 73, 6311–6322 (2015). https://doi.org/10.1007/s12665-014-3853-x
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DOI: https://doi.org/10.1007/s12665-014-3853-x