Abstract: For the specific consequent rock slope,the KS-d curve of the slope safety factor(KS)and the distance (d) between the soft interlayer and the slope shoulder was obtained by using the ultimate balance theory.Then,the Geo-Slope software was used for numerical simulation to verify the analytical calculation formula and the KS-d curve mentioned above.According to KS-d curve,the key weak interlayer of consequent rock slope meeting the requirement of safety factor was determined,which was also the interface between anchorage section and free section,so that the length of anchor cable was optimized.Combined with the study of anchor cable stress mechanism,FLAC3D was used to simulate slope stability coefficient KS under different anchor rows spacing (l),so KS-l curve was obtained,thus the optimum spacing (l) of anchorage rows was determined.On this basis,an optimized slope anchoring model was established,and FLAC3D was also applied to analyze the slope stability.According to the maximum axial force diagram of anchor cable,the material parameters of anchor cable were checked by inverse calculation.The position and characteristics of potential main slip surface could be judged by the positive and negative interface of shear force received by the cement slurry.The optimized scheme met the safety standards and saved a lot of engineering work compared with the original design scheme.It was of great economic value for the future large-scale slope reinforcement and a certain reference value for similar slope engineering.

Key words: anchorage optimization, consequent rock slope ( bedding rock slope), weak intercalated layer, numerical modeling,ultimate equilibrium