Abstract: Landslide related hazards occur frequently in our country. The H-type composite anti-sliding structure is one of the common methods for mitigating large landslides. To explore the anti-sliding mechanism and reinforcement effect of H-type composite anti-sliding structure. Now, the FLAC^3D program is used to simulate the working state of the landslide rock mass with and without the h-type composite anti-sliding structure. Through the comparative analysis, the results show that after setting the H-type compound anti-sliding structure, the stability and the safety factor of the landslide has been obviously improved. The stability and the safety factor of the landslide increased from 1.02 when not set to 1.31. The shear strain increment of the rock and soil mass along the slip zone is reduced by more than 75% on average, and the plastic deformation zone is reduced by nearly 50%. The average reduction of the horizontal displacement of the rock and soil mass in the sliding body area is more than two-thirds. The strengthening effect of the h-type composite anti-sliding structure is very significant. This shows that the anti-sliding mechanism of the H-type composite anti-sliding structure is that its setting can effectively reduce the shear deformation degree of the rock and soil mass in the sliding plane, reduce the development degree of the plastic deformation zone of the rock and soil mass in sliding zone, and narrow the horizontal displacement of the rock and soil mass in sliding zone. The overall stability of the landslide has been significantly improved.

Key words: Numerical Simulation, H-Type Composite Anti-Sliding Structure, Anti-Sliding Mechanism, Reinforcement Effect