摘要
为研究大红山铁矿围岩应力分布特征,以大红山铁矿两个特大采区逐步因爆破而贯通这一特殊工程背景,在探究围岩应力分布机理的基础上,通过对微震监测和应力监测结果进行分析,重点研究了采区贯通后围岩应力重分布情况。研究结果表明位于中II采区南部的采空区围岩体中以应力增加为主,应力增加的程度与离采空区的远近呈反比,但是在靠近采空区约20 m左右的近距离范围内产生了一定程度的卸载,结合现场观察来看,该区域岩体受力变形破裂较严重;南翼采区440 m分段、420 m分段相继回采的过程中,围岩内的应力增加速度开始明显变大,应力增加程度增大,部分临近采空区的围岩从卸载变为应力增加;中II采区下方,即南翼采区的南部区域的围岩以应力卸载为主,这对南翼回采中布置在下盘的回采进路与沿脉干线的稳定性有益,除了会受矿体回采的扰动应力外,采空区贯通产生的扰动应力对这些区域的巷道影响较小。
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.
作者
段鑫
Duan Xin(Yuxi Dahongshan Mining Co.,Ltd.)
出处
《现代矿业》
CAS
2020年第3期43-48,58,共7页
Modern Mining
关键词
采区
贯通
围岩
应力分布
监测
Mining area
Perforation
Surrounding rock
Stress distribution
Monitoring
作者简介
段鑫(1993-),男,助理工程师,653405云南省玉溪市。
