施工技术 2012年7月上 90 CONSTRUCTION TECHNOLOGY 第41卷第368期 高地应力千枚岩地层隧道大变形控制措施探讨 宋嘉辉 (中铁第一指察设计院集团有限公司，陕西西安710043) [摘要]根据兰渝线两水隧道施工中出观大变形的工程实例，对其高地应力地层岩性、变形规律、支护破坏特征、变 形原因进行了分析.根据现场科研试验段控制措施调整情况及现场控制效果，总结了该类地层中隧道大变形控制 技术措施.结合现场变形监测数据结果，探讨了千枚岩，炭质千枚岩地层大变形的发展规律. [关键词]随道工程：千枚岩：高地应力：变形规律：监测：控制措施 【中图分类号]TU452;U459.1[文献标识码]A[文章编号]1002-8498(2012)13-0090-03 Discussion on Large Deformation Controls for Tunnels in High Geo-stress Phyllite Stratum Song Jiahui China Railssay First Survey and Design Institute Group Lad.Xi'an Shaanxi 710043 China) Abstract:Large deformations were observed during the construction of Liangshui Tunnel in Lanyu Railway.With respect to this case this paper analyzed the characteristics of high geo-stress stratum lithology deformation behaviour and failure characteristics of supports.On-site tests were performed to control the deformation and based on the test results large deformation control measures were proposed for similar geological conditions.With the site monitoring data principles governing the large deformation behavior of phyllite stratum were also addressed. Key words:tunnels:phyllite;high geo-stress;deformation;monitoring;control measures 兰渝铁路兰州一广元段地质条件极其复杂，其状岩层被节理切割成碎块状，岩体极破碎，稳定性 中志留系中上统千枚岩、炭质千枚岩是兰渝线典型差.隧道洞身部位的最大水平主应力值与该处单 的软岩、极软岩地层，且处在复杂高地应力区，隧道轴抗压强度比R/0为0.3~3.1，根据《工程岩体 施工开挖过程中极易发生严重的大变形，导致支护分级标准》GB50218一94的规定，属于极高地应力 系统破坏，甚至会发生塌方，严重影响隧道施工安状态，两水进口及斜井工区洞轴向与最大水平主应 全及进度，加大施工成本.本文结合兰渝线两水隧力夹角62°，极易产生大变形. 道的大变形工程实例，探讨千枚岩、炭质千枚岩地2隧道施工变形情况 层大变形的原因、发展规律及变形机理，以期探求 2.1施工...
高地应力千枚岩地层隧道大变形控制措施探讨.pdf
