浅埋大跨黄土隧道管棚受力机制分析  

Analysis of mechanical behaviors of big pipe-roof for shallow buried large-span tunnel

作　　者：李健[1] 谭忠盛[1] 喻渝[2] 倪鲁肃[1] 

机构地区：[1]北京交通大学土木建筑学院,北京100044 [2]铁道第二勘测设计院,成都610031

出　　处：《中国工程科学》2011年第9期92-96,共5页Strategic Study of CAE

基　　金：铁道部重大科技研发计划资助项目(2005K001-D(G)-2)

摘　　要：以郑西客运专线阌乡隧道为依托工程,进行浅埋大跨黄土隧道长大管棚受力机制的研究。对隧道进入下穿高速公路前的管棚纵向变形进行现场监测,根据测试结果分析管棚在隧道开挖过程中的受力特性,得到浅埋黄土隧道长大管棚受力变形规律:掌子面前方约15 m处管棚开始受力,掌子面过后约15 m管棚的受力趋于稳定,管棚的纵向变形总体上呈凹槽形分布,掌子面处管棚受力最大。通过有限差分程序FLAC3D计算不同管棚参数条件下的施工方案,为隧道下穿段管棚工法及施工方案的优化设计提供理论依据,并在下穿段沉降监测中得到验证。A series of research on mechanical behaviors of big pipe-roof in shallow large-span loess tunnel was made on Wenxiang Tunnel in Zhengzhou-Xi＇an Special Passenger Railway.The longitudinal deformations of the pipe-roofs are monitored and the mechanical behaviors of the pipe-roofs are researched at the test section.The force-deformation law of big pipe roof in loess tunnel was obtained：in front of the excavating face about 15 m,the pipe roof started to bear the load;after the excavating face about 15 m,the load became stable;the longitudinal deformation of the whole pipe-roofs was groove-shaped distribution;the largest force of pipe-roofs was at the excavating face.The conclusions can provide reference for the design parameter optimization and the construction scheme selection of pipe-roofs and had been verified in the result of numerical analysis software FLAC3D and deformation monitoring.

关 键 词：浅埋暗挖 下穿施工 黄土隧道 管棚 变形监测 受力机制 

分 类 号：U459[建筑科学—桥梁与隧道工程]