Abstract:In allusion to the sensitivity analysis of rock mass parameters to stope stability, the evaluation model of Orthogonal Experimental Design and Gray Relational Analysis (OED-GRA) is put forward, which can analyze correlation between multiple parameters of rock mass influence each other and stope stability. The 16 typical testing schemes are investigated with the methods of orthogonal experiment and numerical simulation considering four factors, i.e the geological strength index GSI, the rock uniaxial compressive strength σci, the constant mi reflected degree of rock soft and hard, the degree of disturbance to rock mass D in Hoek-Brown strength criterion. The sensibility analysis based on indicators of satisfaction are carried out with four indexes selected, i.e the roof displacement, the roof horizontal stress, the pillar horizontal displacement, the pillar vertical stress. The correlation coefficient between the evaluation index and property parameter of rock mass, and the correlation coefficient between parameters and mechanics parameters are obtained. The results show that the maximal influential degree of rock mass parameters to stope stabilization is the GSI while the minimum is the D, and the GSI more sensitive comparing to the σci and mi. The OED-GRA evaluation model is adopted to avoid the limitations of the single factor analysis sensitivity and multiple factors correlation of different dimensional can be analyzed at the same time, the conclusion is more objective and reliable, which provides a new train of thought for the sensitivity analysis of multiple factors associated.