LI Wenguang.Model Experimental Study on Tunnel Uplift in Liquefiable Foundations[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):488-494.
LI Wenguang.Model Experimental Study on Tunnel Uplift in Liquefiable Foundations[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(02):488-494. DOI: 10.13409/j.cnki.jdpme.20220704005.
Model Experimental Study on Tunnel Uplift in Liquefiable Foundations
Construction of underground tunnels inevitably involves crossing liquefiable strata
which
under seismic activities
can lead to soil liquefaction and subsequent structural damage. Based on the Tangwang Avenue River-Crossing Tunnel project in Bozhou
Anhui Province
the study employed indoor shake table experiments to design and analyze a scale model. It analyzed the vibration-induced liquefaction response patterns of the ground soil and tunnel structure
while investigating the buoyancy-driven deformation mechanism of the river-crossing tunnel during seismic liquefaction. The results indicated that the upper soil layer reached liquefaction approximately 1.5 seconds later than the lower layer
showcasing a more pronounced reduction in shear strength in the upper soil. As the soil depth increased
the rise in excess pore pressure accelerated and its peak was higher. At the start of vibration
the initial liquefaction in the lower soil layer led to a certain downward displacement. Subsequently
as the buoyant force exceeded the effective bearing capacity
the tunnel gradually rose and stabilized. After the cessation of vibration
the tunnel uplift displacement was 8.9 mm.
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