摘要
Abstract
In order to explore the stability of the sublevel stoping with delayed backfill method stope in an underground polymetallic mine during frequent blasting mining,the acoustic wave detection technology was used to collect the acoustic wave data before and dur-ing the mining process of the stope rock mass,and the rock mass integrity coefficient K value in different regions of different mining sta-ges was calculated.Then,based on the indoor rock mechanics parameter values,the strength reduction method based on rock mass damage and the engineering experience method were used to obtain the rock mass mechanics parameters in different regions of different mining stages for numerical simulation of stope stability.The results show that the plastic deformation range of surrounding rock along the width direction of the stope is significantly higher than that along the length direction of the stope.In addition,after the mining of the front area of the stope,there is no tensile stress in the surrounding rock around the goaf.After the mining of the middle area,the safety factor of the tensile stress of the surrounding rock is 2.67.After the mining of the back area,the safety factor of the tensile stress is reduced to 2.29,and the safety factor of the two-stage tensile stress is greater than 1.5,indicating that the surrounding rock is in a stable state.关键词
声波检测/数值模拟/稳定性/塑性区/拉应力安全系数Key words
acoustic detection/numerical simulation/stability/plastic zone/safety factor of tensile stress分类
矿业与冶金
