深部巷道围岩破裂演化实测研究

Deep Roadway Surrounding Rock Burst Evolution Test Research

深井高应力巷道支护是目前巷道支护研究的重点和难点,为研究该类巷道岩层破坏失稳机理,在未开掘巷道两帮围岩中布置应力、位移监测点,揭示巷道掘进全过程围岩应力转移及不同深度岩体位移变化特征。监测结果表明：巷道揭露初期在浅部围岩形成应力集中,随时间推移围岩集中压力向深部转移,最终平衡在2.5~4 m围岩内;2 m内围岩位移量占总位移量的75%以上,浅部围岩移动变形量主要为松散破碎变形量。依据监测结果设计二水平轨道巷采用锚杆＋锚索＋U型钢的初次支护和锚注二次支护的围岩控制方案,该技术取得了良好的效果,控制围岩变形量在40 mm以下。

Supporting of the deep roadway was a complicated and important technology in the underground engineering field. For the study of the rock of roadway destruction instability mechanism, without cutting the arrangement of the stress and displacement of surrounding rock of roadway two posts, the drivage surrounding rock stress transfer characteristics of rock mass displacement and different depth were revealed. Monitoring results showed that the roadway to expose the early formed in the shallow surrounding rock stress concentration, concentrated stress of surrounding rock to deep shift over time,the final balance in 2.5 ~ 4 m within the scope of surrounding rock; Within the scope of 2 m accounted for over 75% of the total displacement of surrounding rock displacement, shallow mainly for loose and broken mobile deformation of rock mass deformation. Engineering practice showed that the technology obtained the good effect of governance, the surrounding rock deformation was reduced.