千枚岩地层隧道支护滞后破坏特征与防治措施探讨  

Discussion on Delayed Failure of Tunnel Support in Phyllite Strata and Its Countermeasures

作　　者：陈韵 Chen Yun(China Railway 18th Bureau Group Second Engineering Co.,Ltd.,Tangshan Hebei 064000,China)

机构地区：[1]中铁十八局集团第二工程有限公司,河北唐山064000

出　　处：《石家庄铁路职业技术学院学报》2024年第2期33-38,共6页Journal of Shijiazhuang Institute of Railway Technology

摘　　要：针对隧道穿越高地应力炭质千枚岩地层时支护滞后性破坏现象,综合采用现场调研、数值计算和理论分析的方法,分析支护受力特征和破坏机理,探讨支护滞后破坏的防治措施。结果表明:支护拱部的压应力随千枚岩遇水软化而逐步增加导致破坏的产生,地下水的先无后有时支护滞后破坏的最关键影响因素,千枚岩地层隧道施工中应充分探明水文地质环境,通过加强支护和提高施工质量来预防滞后破坏的发生。In response to the phenomenon of delayed failure of support when the tunnel passes through high stress carbonaceous phyllite strata,a comprehensive method of on-site investigation,numerical calculation,and theoretical analysis was adopted to analyze the stress characteristics and failure mechanism of support,and to explore the prevention and control measures for delayed failure of support.The results show that the compressive stress at the support arch gradually increases with the softening of the phyllite when it comes into contact with water,leading to the occurrence of failure.The lack of groundwater first and then the presence of groundwater are the most critical factors affecting the lagging failure of support.In the construction of tunnels in the phyllite formation,the hydrogeological environment should be fully explored,and the occurrence of lagging failure should be prevented by strengthening support and improving construction quality.

关 键 词：隧道工程 炭质千枚岩 大变形 破坏特征 防治措施 

分 类 号：U25[交通运输工程—道路与铁道工程]