摘要
兰渝铁路位于青藏高原隆升区边缘地带,地质环境极为复杂特殊,存在第三系富水粉细砂岩、高地应力软岩、大直径TBM长距离快速掘进等施工难题,采用室内外试验、理论计算和现场实践相结合的方法,对特殊复杂地质隧道修建技术进行多方面的创新和探索,得到以下成果:1)通过数值分析和现场试验,对第三系砂岩物理力学性质、微观结构和复杂的水稳特性等进行研究,采用地表深井和洞内真空轻型井点相结合的综合降水体系,首创富水粉细砂隧道全断面水平旋喷超前预加画施工工法,攻克第三系流砂难题;2)提出高地应力软岩设计阶段变形潜势和施工阶段动态调整的分级方法,针对变形机制提出主动应力解除与被动控制相结合的变形控制技术,首创运营期间自动化实时监测系统,构建软岩隧道设计、施工、运营管理的成套技术体系;3)提出TBM设备参数设计原则,研发同步衬砌、多级级联皮带机出碴系统,首创分阶段通风技术,解决大直径T B M安全快速长距离施工的难题。兰渝铁路特殊复杂地质隧道修建过程中取得的技术成果,填补了多项空白,推动了隧道修建技术进步。
Lanzhou-Chongqing Railway is located in the uplift margin of the Tibetan Plateau,where the geological environment is very complicated and special.Based on numerical analysis and field tests,the physical and mechanical properties,micro-structure,and complicated water-related stability of the Tertiary sandstone are studied.A comprehensive dewatering system integrating deep surface wells and vacuum light well points in tunnel is used and the construction technique featured with advance reinforcement by horizontal jet grouting for the full-face of aquiferous silty fine sand tunnels is invented to solve tha problem of the Tertiary quick sand.In addition,the classification method for deformation potentiality in design and dynamic adjustment in construction of tunnels in high geostress soft rock is established,the deformation control technology combining active stress release and passive control according to the deformation mechanism is developed,an automatic real-time monitoring system for operation is invented,and a complete technological system of design,construction,and operation management of soft rock tunnels is built.Moreover,the TBM equipment parameter design principles are put forward,the parallel lining and multi-stage belt conveyor mucking system is researched,tha phased ventilation technology is invented and thus the problem of safe and fast long-distance construction by large-diameter TBMs is solved.The technological achievements have filled in gaps and facilitated development of the tunnel construction technology.
作者
李宁
李国良
LI Ning;LI Guoliang(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,Shaanxi,China)
出处
《隧道建设（中英文）》
北大核心
2018年第3期481-493,共13页
Tunnel Construction
基金
复杂地质特长隧道安全施工综合技术研究(2009G009-B)
关键词
兰渝铁路
隧道
特殊复杂地质
第三系砂岩
高地应力软岩
TBM
Lanzhou-Chongqing Railway
tunnel
special and complicated geology
Tertiary sandstone
high geostress soft rock
TBM
作者简介
Corresponding author.E-mail:qscln@126.com
