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Strategic Study of CAE >> 2014, Volume 16, Issue 8

Double-layer Support Technology of Large-section Loess TunnelBy Benching Method

1. China Railway First Survey and Design Institute Group Ltd.,Xi’an 710043,China;

2. China Railway Southwest Research Institute Co. Ltd.,Chengdu 610031,China

Funding project:铁道部科技研究开发计划项目(2005K001-D(G)-1) Received: 2014-04-20 Available online: 2014-08-13 13:48:03.000

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Abstract

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 double-layer support system of large-section loess tunnels by benching method are acquired. It successfully resolved the construction difficulties of super-large-section tunnel (171m2) under crossing the operating railway in the depth of only 11m under sandy neoloess, thus to have the significant reference for the design and construction of the similar engineering.

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