Abstract: The model test was carried out to simulate the sliding process of different rock mass by using the platform with variable angles developed by Northeastern University. Based on data acquisition at two sliding angles， the limit equilibrium method and vector method was theoretically applied to analyze doublesided sliding， singlesided sliding and spatial sliding angle. According to the broken structural plane， the MohrCoulomb criterion was used to backanalyze the mechanical parameters. The test result shows that， the increase of sided sliding angle is less when the boundary angle between sided sliding and doublesided sliding is between 40° and 50°， and the cohesion between block and structural plane rises with the increase of mortar grade. The mechanical parameters obtained based on back analysis can provide basis for the block stability analysis in theory.

Key words: variable angle space, block slide, limit equilibrium method, vector method, back analysis