Abstract: A self-developed test platform was used to conduct a large number of rock wedge sliding experiments， based on which a distinguishing criterion of limit equilibrium state to judge whether the wedges slide or not was put forward. The wedges sliding process and its limit equilibrium state were studied to get the beta-alpha equation (relation between inclination and rotation angle) under different condition. The effects of rock structural plane parameters (occurrence， roughness coefficient JRC) on the correlation coefficient of the proposed function equation were quantitatively analyzed， with the beta-alpha equation given by using the known slider roughness coefficient JRC and structural plane angle ω.

Key words: rock mass structure, sliding, limit equilibrium, experimental analysis, discrimination method