关键词: 采区 贯通 围岩 应力分布 监测

Abstract: The study of stress distribution characteristics of surrounding rock plays an important role in the stability analysis of surrounding rock,this paper takes the special engineering background that two major mining areas of Dahongshan Iron Mine are gradually blasted through,on the basis of exploring the stress distribution mechanism of surrounding rock,through the analysis of microseismic monitoring and stress monitoring results,the research focuses on the stress redistribution of surrounding rock after the mining area is connected.The research results show that:The stress is mainly increased in the surrounding rock mass of the goaf in the southern part of the Central II mining area,the degree of stress increase is inversely proportional to the distance from the goaf,however,a certain degree of unloading occurred in the close range of about 20 m near the goaf.Combined with the field observation,the rock mass deformation and rupture in this area is serious; During the process of 440 m section and 420 m section of the southern wing mining area,the stress increase rate in the surrounding rock began to increase significantly,and the stress increase increased，partial rock adjacent to the goaf has changed from unloading to stress increase; Below the Central II mining area,the surrounding rock in the southern part of the southern wing mining area is dominated by stress unloading,which is beneficial to the stability of the mining approach and the downstream trunk line arranged in the lower section of the southern wing,in addition to the disturbance stress that will be mined by the ore body,the disturbance stress generated by the penetration of the goafs has less influence on the roadway in these areas.

Key words: Mining area,Perforation,Surrounding rock,Stress distribution, Monitoring