Numerical Modeling of the Seismically Induced Uplift Behavior of Twin Tunnels
Publication: International Journal of Geomechanics
Volume 21, Issue 1
Abstract
During an earthquake, large movements of soil may cause the instability and uplift of buried structures in liquefied soil. Intensive studies on the uplift behavior of underground structures have mainly focused on a single tunnel. In this paper, numerical modeling is performed to investigate the uplift mechanism of twin tunnels with various configurations under earthquake loading. The excess pore pressure and uplift displacements of twin tunnels with different mutual positions and spacings are analyzed and compared with those of a single tunnel. The effects of the tunnel spacing and the mutual position on the uplift mechanisms of the tunnels are investigated. The results show that the generation of excess pore pressure and the liquefaction of soil surrounding the tunnels are prerequisites for the uplift. The interaction between twin tunnels affects their uplift behavior.
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Acknowledgments
This research was funded by the National Natural Science Foundation of China (Nos. 41630641 and 51708405), the Project of Tianjin Science and Technology Plan (No. 16YDLJSF00040), and the Systematic Project of Guangxi Key Laboratory of Disaster Prevention and Structural Safety (2019ZDK031). The authors appreciate the financial support.
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Published In
International Journal of Geomechanics
Volume 21 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jul 30, 2019
Accepted: Aug 23, 2020
Published online: Oct 3, 2020
Published in print: Jan 1, 2021
Discussion open until: Apr 3, 2021
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