摘要
内昆线曾家坪一号隧道进口段为三线车站隧道,最大开挖跨度为20.68m,高度为12.60m(不含仰拱),断面积约240m^2,扁平率仅0.61,埋深2～50m,洞身穿越块石土和曾家坪1号断层,地质条件极差,属典型的浅埋、不良地质、超大断面隧道。文章较为详细地介绍了该隧道的设计思路,为今后类似条件下的隧道设计提供了实例。
The entrance section of Zengjiaping No. 1 tunnel on Neikun Railway is a triple -line station tunnel with the max. Span of 20. 68 m, height of 12. 60 m (exclude invert), area of 240 m2, flatness ratio of 0. 61 and overburden of 2 - 50 m . The tunnel passes through block rocks and Zengjiaping No. 1 fault and is a typical tunnel with shallow overburden and super large section under extremely poor geological condition. This paper describes the design concepts of this tunnel to offer an example for the future similar projects.
关键词
大断面浅埋隧道
不良地质
隧道设计
施工方案
Shallow Tunnel with Large Section Poor Geological Condition Tunnel Design
