深部金属矿山充填开采高阶段矿柱岩体力学参数确定方法OA

The traditional Hoek-Brown strength criterion was improved by modifying the calculation model of the geological strength index(GSId)after blast-induced damage.The improved Hoek-Brown strength criterion was applied to a deep high-level cut-and-fill metal mine in Northeastern China.The research results indicate that considering only the disturbance effect of excavation blasting on the geological strength index of high-level pillars effectively avoids the accumulation of errors that may arise from considering both GSId and the disturbance factor(D),and also avoids the influence of subjective factors in the determination of D.The modified GSId model better reflects the structural characteristics of high-level pillar rock masses in engineering practice,and the improved Hoek-Brown criterion provides accurate mechanical parameters for stability evaluation.The calculated mechanical parameters of high-level pillar rock masses are within the reasonable range obtained by the engineering BQ value method,and numerical simulation verifies the rationality of the improved Hoek-Brown criterion for such calculations in deep metal mine backfill mining.The research results provide a theoretical basis for the stability evaluation of high-level pillars in deep metal mine backfill mining.