Numerical Analysis And Research of Entrance Slope of Shallow Buried Karst Tunnel

Abstract

Abstract Based on practical engineering condition of Highway karst tunnel, ANSYS was used to numerical simulate the slope of the tunnel in the entrance, and the result was used to compare with monitoring measurement result. The numerical simulation results showed that the bottom karst cave has a big influence on arc bottom of the tunnel after the excavation. The most influenced part is vault, with 2 times tunnel diameter influence area to the tunnel. At the first 35 m of excavation, there is a relatively greater influence to slope, and measures should be taken; after 35 m of excavation, there is little influence to slope. The result can be a reference to the design, construction and research of the tunnel.