Construction Deformation Analysis and Reinforcement Measures of Cross-tubular Vertical Karst Cave Tunnel
Tunnel construction in karst areas can encounter intrusion of caves,which threatens construction safety.In this paper,numerical simulation is used to study the effect of vertical water fall caverns on tunnel excavation and support structure in the context of actual projects,and to propose tunnel reinforcement measures.The results show that during the tunnel excavation,the cavern wall near the tunnel will have a tendency to collapse into the cavern,and there is a certain risk of collapse;influenced by the partial pressure of the surrounding rock,the initial support appears to squeeze into the cavern deformation,increasing the compressive stress in the longitudinal direction of the initial support tunnel,and the bending deformation at the elevation arch of the tunnel.The deformation of the secondary support structure is smaller,but there is still deformation along the cavern profile.Combined with the simulation calculation results,we proposed the reinforcement measures of lining structure optimization,imposing arch protection,setting reinforced concrete slab at the bottom of the elevation arch and optimizing the drainage to strengthen the tunnel,and the reinforcement results were verified through field monitoring,and this study can provide reference for similar projects.
tunnel engineeringfalling water cavestabilitytunnel deformationreinforcement measures
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