Abstract: In order to further study the mechanism and influcing factors of the toppling of layered anti-dip slopes, the discrete element simulation based on centrifugal model test was adopted. The formation of rupture surface was realized by presetting random cracks in the rock layers. The simulation results are in good agreement with the physical test. Slope deformation can be divided into three stages:Initial creep, steady-state deformation, and instability failure. The results show that:The rupture surface is straight-line after the failure load (G_f) is reached, and the occurrence is controlled by the dip angle of the rock layer; The G_f value is related to the power function of the slope angle; The failure of the anaclinal slope needs to satisfy the initial conditions, and the deformation is closely related to the bending moment of the rock layer, when the dip angle is 70°-80° and the slope angle is larger than 60°, it is the most vulnerable state. There are three typical failure modes:Toppling-rupture-block detachment type, toppling-bend-rupture type, and toppling-reversal type, which are controlled by the combination of dip and slope angle. The orthogonal simulations on material parameters show that the sensitivity of each parameter to G_f from large to small is density, friction angle of beddings, layer thickness, density ratio, and cohesion of beddings; The value of friction angle of beddings can affect the occurrence of the rupture surface, thus controlling the size of the deformation area, while other parameters only affect the value of G_f.

Key words: centrifugal model test, discrete element method, anaclinal slope, toppling deformation