Abstract: Top load of slope caused by vehicle and slope surcharge is an important factor affecting slope stability. Firstly, the mechanical analysis model for rock slope under the top load is established based on the superposed cantilever beam model and the limit equilibrium theory. Then the residual overturning force and residual slip force of anti-inclined rock slope are derived, and the criterion for the failure mode of rock stratum is proposed. Meanwhile, the theoretical method is programmed by Matlab, and its theoretical solution is obtained and compared with the results of the discrete element simulation, which verifies that the proposed model is reasonable. Finally, according to the proposed method, the sensitivity analysis on different parameters is carried out. The results show that the effect of top load is large on the residual force of strata, but is small on the failure mode. The sensitive angles of slope and rock strata greatly improve the slope stability when it is larger than the actual angle value. The interlayer cohesion has a significant influence on the stability of slope with self-weight. The safety factors of numerical simulation and theoretical analysis are consistent, which proves the correctness of the theoretical solution of the flexural toppling failure under the top load. The results can provide references for the stability analysis of similar projects.

Key words: flexural toppling failure, slope top load, limit equilibrium method, residual force, safety factor