大断面黄土隧道台阶法双层支护技术  

Double-layer support technology of large-section loess tunnel by benching method

作　　者：李国良[1] 宋冶[2] 李雷[1] 王新东[1] 李波[2] 

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043 [2]中铁西南科学研究院有限公司,成都610031

出　　处：《中国工程科学》2014年第8期54-63,共10页Strategic Study of CAE

基　　金：铁道部科技研究开发计划项目(2005K001-D(G)-1)

摘　　要：依托郑西高铁高桥隧道小角度下穿既有南同蒲铁路施工实践,通过试验研究取得大断面黄土隧道台阶法双层支护体系的力学特性及施工技术关键,在砂质新黄土条件下成功解决埋深仅11 m的下穿运营铁路的超大断面(171m2)隧道施工,对类似工程的设计与施工具有重要参考价值。Relying on the construction under crossing the existed south Tongpu Railway with a small included angle at Gaoqiao tunnel of Zhengzhou—Xi＇an high speed rail,carrying out the test and study,the mechanical characteristics and key construction techniques of the doublelayer support system of large-section loess tunnels by benching method are acquired.It successfully resolved the construction difficulties of super-large-section tunnel（171 m2）under crossing the operating railway in the depth of only 11 m under sandy neoloess,thus to have the significant reference for the design and construction of the similar engineering.

关 键 词：大断面黄土隧道 台阶法 双层支护 下穿 

分 类 号：U455[建筑科学—桥梁与隧道工程]