摘要
为了研究动压对煤柱下方巷道稳定性的影响,采用高精度微震监测系统和顶板动态监测仪,研究了2200工作面底板微震活动特征和动压对4106巷道变形破坏的影响。结果表明:2200工作面底板微震事件具有非对称的特征,呈现下大上小的形态,微震事件集中发生深度约24m,4106材料巷受到2200工作面采动影响较小;2200工作面采空区对4106运输巷影响范围为120~140m,4106运输巷变形速率影响区域与2200工作面采动影响范围基本一致;随着煤柱宽度的增加,4106运输巷变形呈现先增大后减小的变化,最后趋于稳定,4106运输巷变形破坏表现出明显的非对称特征和区域化分布.
In order to study the influence of dynamic pressure on the stability of roadway under coal pillar,the characteristics of micro-seismic activity of floor in 2200 working face and the influence of dynamic pressure on deformation and failure of 4106 roadway were studied using high precision micro-seismic monitoring system and roof dynamic monitoring instrument.The results show that the micro-seismic events on the floor of 2200 working face are asymmetrical,showing the shape of large upwards and small downwards.The micro-seismic events mainly occur at the depth around 24 m,and the influence of 2200 working face on 4106 roadway is relatively less;the influence region of 2200 working face mined-out-area on 4106 transport roadway is 120—140 m,and the influenced area of 4106 transport roadway deformation rate is basically the same as that of 2200 working face.With the increase of coal pillar width,the deformation of 4106 transport roadway increases at first,then decreases,and finally tends to be stable.The deformation and failure of 4106 transport roadway show obvious asymmetric characteristics and regionalized distribution.
引文
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