高寒特长隧道高应力富水环境下的结构技术研究  

Study on Structure Technology of High-cold and Super-long Tunnel Under High Stress and Rich Water Environment

作　　者：翁振华[1] Weng Zhenhua(China Railway 18th Bureau Group 3rd Engineering Co. Ltd. , Zhuozhou Hebei 072750, China)

机构地区：[1]中铁十八局集团第三工程有限公司,河北涿州072750

出　　处：《铁道建筑技术》2018年第6期59-63,共5页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(11-29C)

摘　　要：由于位于富水断层破碎带的山岭隧道地层岩性复杂、围岩破碎,地下水补给源充分,在施工中严重影响了隧道围岩的稳定性,极易发生高压突水等地质灾害。本文结合大坂山隧道富水断层破碎带的施工,通过使用FLAC3D有限差分数值模拟软件中的流固耦合模块,研究了该类高寒特长大隧道在高应力富水环境下的结构安全技术,分析了在断层破碎带区域施工过程中的渗流规律以及掌子面稳定性的流固耦合机理,并对隧道开挖过程中产生涌水灾害时掌子面前方水压、掌子面变形和掌子面塑性化规律进行了研究。在对比分析不同开挖方法的基础上,提出了合理的开挖方法和支护措施(采用小导管预注浆加固结合H175型钢进行支撑),有效地控制了围岩的变形,很大程度保证掌子面稳定。Because of the complex lithology of the mountain tunnel in the fracture zone of the Fushui fault and the fragmentation of the surrounding rock, the groundwater recharge source is sufficient, and the stability of the surrounding rock is seriously affected during tunnelling, and high-pressure water inrush and other geological disasters are easily occurred. The construction safety of the fracture zone with the Fushui fault in the Dabanshan Tunnel is studied by using the fluid-structure coupling module in FLAC-3D finite-difference numerical simulation software to study the structural safety technology for the ultra-cold super-long and large tunnel with a high-stress, water-rich environment. During the construction process, the seepage law and the fluid-solid coupling mechanism of the stability of the face are studied. The hydraulic pressure, the deformation and the plasticity law in front of tunnel face during the flooding process are studied. On the basis of comparative analysis of different excavation methods, reasonable excavation methods and support measures （ pre-grouting with small ducts combined with H175 steel for support） are proposed to effectively control the deformation of the surrounding rock, ensuring a great degree of assurance.

关 键 词：高寒特长隧道 富水断层破碎带 流固耦合 有限差分数值 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]