摘要
以兰渝铁路胡家湾隧道为背景,揭示了断层破碎带挤压性围岩地质特征和大变形特征,阐明了初期支护承载允许围岩变形范围的确定原则及由此形成的解决初期支护侵入二衬限界问题的技术方案。通过对破碎围岩、初支结构加强技术措施、现场优化的台阶临时仰拱和CRD开挖法分析,总结形成控制断层破碎带挤压性围岩大变形的关键施工技术,即"围岩加固+初期支护加强+调增预留变形量+优化开挖工法"等一系列控变技术措施,取得了较好的控变效果。
Taking Hujiawan Tunnel of Lanzhou-Chongqing Railway as the background,this paper reveals the geological characteristics and large deformation characteristics of the extruding surrounding rock in fault fracture zone,expounds the determination principle of the allowable deformation range of the surrounding rock in the initial support bearing capacity and the technical scheme formed to solve the problem of the initial support invading the secondary lining clearance.Based on the analysis of broken surrounding rock,strengthening technical measures of primary support structure,on-site optimized bench temporary invert and CRD excavation method,this paper summarizes the key construction technologies to control the large deformation of extruding surrounding rock in fault fracture zone,that is,a series of technical measures to control the deformation,such as"reinforcement of surrounding rock+strengthening of primary support+increase of reserved deformation+optimization of excavation method",which has achieved good control effects.
作者
张秀良
ZHANG Xiuliang(China Railway 16^(th)Bureau Group Co.Ltd.,Beijing 100018,China)
出处
《铁道建筑技术》
2021年第5期131-134,161,共5页
Railway Construction Technology
基金
中铁十六局集团有限公司科技研发计划项目(2009-14)。
关键词
隧道
断层破碎带
挤压性围岩
大变形
tunnel
fault fracture zone
extruding surrounding rock
large deformation
