Abstract: The method of selecting mechanical parameters of rock mass has become the key technology ofslope stability analysis. Taking the study on the mechanical parameters of slope rock mass in an open-pilmine as an example, the uniaxial compressive strength, shear strength, tensile strength, modules of elasticity and poisson ratio of rock blocks were obtained through laboratorv tests. On this basis . the rock massquality was evaluated by ROD method and CSIR method, and the rock physical and mechanical parame-ters were reduced by combining with Hoek-Brown strength criterion. The rock mass parameters obtainedwere basically consistent with the characteristics of the actual in-situ test results.

Key words: open-pit slope, mechanical parameters of rock mass, rock mass quality evaluation;Hoek-Brown strength criterion