In mountain region

landslide has a significant influence on the force and deformation of existing tunnels. The existing researches generally separate the landslide and the tunnel to investigate. However

very little attention is paid to the combination of the two kinds of engineering problems. Moreover

most studies remain on the monitoring analysis of practical engineering. It is rare to analyze the landslide-tunnel interaction by theoretical analysis. In this study

firstly

the landslide thrust is deduced based on the transferring coefficient method and the limit equilibrium method. Secondly

imposing the landslide thrust on the existing tunnel

and establishing elastic foundation beam model for the landslide-tunnel interaction

the internal force and displacement of arbitrary tunnel section are solved by the transfer matrix method. In addition

three-dimensional numerical model is established to simulate the landslide-induced tunnel deformation. The numerical results are compared with the theoretical method

and good consistency is obtained. Finally

the influences of the landslide thrust

the foundation coefficients in the sliding and the sliding bed

tunnel lining stiffness and tunnel length are analyzed. The results can provide certain theoretical support for reinforcement and maintenance of existing tunnels in landslide area.