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| Seismic stability of immersed tunnel under locked backfill |
| WANG Qiuzhe1,2, HAN Rui2, BAI Xiaoxiao2, ZHAO Kai2*
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1. School of Architectural Engineering and Management, Jiangsu Vocational College of Business, Nantong 226000, Jiangsu, China;
2. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210000, Jiangsu, China |
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Abstract In order to study the seismic stability of immersed tunnel, a viscoelastic-plastic stress-strain hysteresis curve was established based on the extended Masing rule, and the shear-coupled volumetric strain increment model was taken as the source term of the residual pore water pressure growth in Biot dynamic consolidation equation, an effective stress analysis method for sand liquefaction was established. The method was implemented based on the FLAC3D computing platform. The interaction model between sandy seabed and submarine tunnel was established, and the anti-liquefaction mechanism of locked backfilling under seismic loading was studied. The results showed that the locked backfilling increased the anti-liquefaction strength of the seabed and the friction resistance, finally reduced the residual uplift distance, which effectively improved the seismic stability of the immersed tunnel.
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Received: 29 November 2022
Published: 20 September 2023
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