Excavation and load reduction is play an increasingly important role in the treatment of large and complex landslides.In this paper

outdoor model tests are carried out to study the influence of landslide slip caused by loading on the tunnel and the influence of damage on the tunnel by loading.The results show that:（1）The time-dependent effect of landslide thrust in the sliding body caused by the sliding effect of the landslide parallel to the slip surface has a time-varying effect.（2）The influence of landslide thrust on the deformation of the tunnel varies greatly along the longitudinal direction.The preliminary test shows that the location of the transition zone is related to the magnitude of the landslide thrust.The soil around the sliding zone first reaches the stress amplitude

leading to the transition of tension and compression;the sliding body distant from the sliding zone gradually reaches the transition of stress amplitude.（3）Tunnel transverse circumferential stress is larger than the arch crown stress.（4）The stress in the circumferential section of the tunnel is symmetrical.The bottom of the tunnel is under compression whereas the top is under tension;the strain at the bottom is less than that at the dome

and the deformation of the tunnel is not recoverable.（5）The load reduction of excavation under different working conditions has different degrees of effect to suppress the landslide deformation;this reduces the strain of the tunnel

especially in the vicinity of the sliding belt

which confirms the significant effect of excavation and load reduction on tunnel-landslide control works.