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Tunnel-landslide systems often cause slope deformation due to tunnel excavation along the slip surface. Based on the three-dimensional numerical calculation, the point safety factor of the interface (slip surface) of the tunnel-landslide system is defined as the ratio of the shear strength of the node to the sliding force. Taking an oblique tunnel-landslide system along the BAOJI-LANZHOU Passenger Dedicated Line as the main study objectives, the author determines the deformation mechanism of tunnel-landslide systems through the analysis of the distribution characteristics of the point safety factor of the interface. In this study, the conditions during excavation, conditions after construction, the interaction stability, deformation laws and possible failure modes, etc. of the tunnel-landslide system are seriously investigated. Our research indicates that the point safety factor of the interface can be taken as a quantitative assessment index of the tunnel-landslide system’s stability.

Research on the Deformation Mechanisms of a Tunnel-Landslide System based on the Point Safety Factor of the Interface