LI Mingda,ZHANG Yu,ZHOU Jing.Seismic Response Analysis of Tunnel under Karst Cave Locations and Combinatorial Effect[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(03):472-479.
LI Mingda,ZHANG Yu,ZHOU Jing.Seismic Response Analysis of Tunnel under Karst Cave Locations and Combinatorial Effect[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(03):472-479. DOI: 10.13409/j.cnki.jdpme.202006014.
Seismic Response Analysis of Tunnel under Karst Cave Locations and Combinatorial Effect
To investigate the seismic response of tunnels under concealed caves in the karst cave zone, the program of equivalent load time history was compiled, based on the viscous-spring boundary principle. Detailed discussions were presented regarding the seismic response of tunnels under different conditions, such as five karst cave locations at the structural circumference and eight positional combination effects. The results show that the node acceleration response of structures increased with the increase in distance between the node and the top surface of the surrounding rock. Compared with the combinatorial effect of the cave at 90° and 180° locations, the cave at 180° has a certain weakening effect on the acceleration response of the structure bottom. Under the positional combination effect, the stress variation range is roughly a quarter of the structure. Due to the interaction of the karst caves, the structural stress envelope diagram is slightly smaller than the outermost edge of the envelope diagram under the action of two single caves. Whether the action of a single cave or the combinatorial effect, the influence range of structural stress under karst caves is around the spandrel and arch foot of the structure. The conclusions drawn in this study provide a practical reference for the design, construction, and monitoring of similar projects.
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