| With the increase of mining depth,the occurrence of complex ore bodies,ore bodies around the subsidence area and other difficult mining bodies increase,and the problems of low recovery efficiency and high safety risk will be more prominent.In view of the production technical problems currently encountered in mines,it is urgent to optimize the existing mining methods and processes to achieve safe and efficient mining of gold resources in combination with the actual problems of mine production.In this paper,the high-segment mining of broken ore body in a gold mine in Tajikistan is studied,and various research methods such as theoretical analysis and numerical simulation are comprehensively used to carry out in-depth research on rock mass quality evaluation,stope structure parameter optimization and stope roof stability analysis of mining area engineering.The main research work and achievements of this paper are as follows :(1)Based on the results of engineering geological investigation,joint fissure field investigation and rock physical and mechanical parameters test,the RMR rock mass classification system is used to grade the quality of ore and rock.It is concluded that the rock mass of the lower plate of the ore body is grade IV,and the quality is poor.The upper plate and the ore body are grade III,and the quality is good.(2)According to the analysis and evaluation results of rock mass quality,the instability and deformation failure characteristics of the subsequent filling stope in the segmented open stope are analyzed,and the Mathews method is used to analyze the stope stability.The range of the primary stope width is less than 13 m.(3)According to the range of stope width selected by Mathews method,FLAC3 D numerical simulation software was used to carry out the simulation study of stope structure parameters,and the stress and strain at key positions were monitored and analyzed.The results showed that the stope width of room stope was 12 m,and that of pillar stope was11 m.(4)The blasting load data of stope mining are obtained by LS-DYNA numerical simulation software and imported into FLAC3 D numerical simulation software for dynamic calculation.The monitoring and stability analysis of the stress and strain of stope under the action of blasting show that the increase of section height and the increase of blasting charge due to high section mining will have a great influence on the stability of stope.(5)Due to the large blasting disturbance of pillar stope,the long grouting anchor cable support technology is used to pre-support the broken area of pillar stope.This study will help to improve the mining efficiency,reduce labor intensity,and improve the level of mine safety and security.At the same time,it has important application value and theoretical significance to improve the economic benefits of mines and realize the sustainable development of mines. |
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