Based on many actual projects

through investigating slope rock mass containing multi-weak interlayers with different rock dip angles θ

slope angles β and structural face intervals h

safety factors and the location of critical failure surfaces are calculated by the method of Sarma and strength reduction method. Deformation failure mechanism of slope rock mass containing multi-weak interlayers is studied. The result shows: ①Failure mechanism and failure surface of layered rock slope are greatly different under the condition of different θ

it shows a progress of sliding failure

slip split failure

collapse

toppling failure

sliding failure when θ is increasing. ②As β and h are fixed

the stability of vertical layered slope is slightly larger than that of horizontal layered slope; and anti-dip layered rock slope is obviously larger than bedding rock slope. ③β affects the slope instability and damage features directly

and safety factor of bedding rock slope is reduced by nearly 53% as well as 40% reduction for the safe factor of anti-dip stratified rock. ④Effects of h are minor on slope deformation and failure mechanism but significant on stability

strengthening the monitor and reinforcing dense structure surface rock slope in practice are suggested.