Abstract: The existence of structural planes destroys the integrity of rocky slope with block fracture, which can directly affect the mechanical properties and stress distribution of rock mass, making the stability analysis of such slope very complex.The block theory is an efficient analysis method suitable for rock mass stability, which has been developed and improved in recent years.However, the block theory can not fully reflect the interaction between the structural planes of rock mass while numerical simulation can give a full consideration to this.In this paper, the block theory is used to identify the type and instability mode of movable blocks and, on the basis of the determination of movable blocks, the numerical simulation is also used to assist the analysis of slope stability and reveal the instability mechanism of rocky slope with block fracture, thus providing a new approach to the stability analysis of such slope.

Key words: Rocky slope, Structural planes, Block theory, Numerical analysis, FLAC3D