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隧道建设(中英文) ›› 2013, Vol. 33 ›› Issue (1): 17-21.DOI: 10.3973/j.issn.1672-741X.2013.01.003

• 研究与探索 • 上一篇    下一篇

施工过程对软弱围岩隧道空间效应的影响分析

乐静1, 杨朝帅2   

  1. (1. 成都市工业职业技术学校土木工程系, 四川 成都 610081; 2. 中铁隧道集团有限公司技术中心, 河南 洛阳 471009)
  • 收稿日期:2012-09-11 修回日期:2012-11-20 出版日期:2013-01-20 发布日期:2013-02-06
  • 作者简介:乐静(1963—),女,四川达县人,1984年毕业于西南交通大学隧道及地铁专业,本科,高级讲师,现从事隧道与地下工程研究。

Analysis on Influence of Construction on Spatial Effect of Tunnel in Weak Rock Mass

LE Jing1, YANG Chaoshuai2   

  1. (1. Department of Civil Engineering, Chengdu Industrial Vocational and Technical College, Chengdu 610081, Sichuan, China; 2. Technology Center of China Railway Tunnel Group Co., Ltd.,Luoyang 471009, Henan, China)
  • Received:2012-09-11 Revised:2012-11-20 Online:2013-01-20 Published:2013-02-06

摘要:

为了研究在软弱围岩隧道三台阶开挖过程中,施工工序对围岩变形、应力的空间效应影响,以某软弱围岩双线铁路隧道为例,通过数值模拟,分析隧道周边围岩的变形和应力的空间变化过程,并将计算结果与现场监测数据进行对比验证。结果表明: 先行最大拱顶沉降和先行最大收敛位移分别达到总位移的53.3%和67.28%;上、中台阶的开挖对拱顶和起拱线处围岩应力的变化影响巨大;锁脚旋喷桩与围岩之间的压力变化受上、中台阶开挖的影响较大,且待开挖台阶土对隧道周边产生外撑力,能对接触压力有一定影响。

关键词: 软弱围岩, 双线铁路隧道, 先行位移, 空间效应, 三台阶开挖

Abstract:

The deformation of rock mass and the spatial effect of stress of a doubletrack railway tunnel in weak rock mass are analyzed by means of numerical simulation, and the calculation results are compared with the monitoring data, so as to investigate into the influence of construction on the deformation of rock mass and the spatial effect of stress. Conclusions drawn are as follows: 1) The maximum presettlement of the crown takes 53.3% of the total settlement, and the maximum preconvergence takes 67.28% of the total convergence. 2) The excavation of the top heading and the bench has great influence on the variation of the stress at the crown and the spring line. 3) The excavation of the top heading and the bench has great influence on the variation of the stress between the footlocking jet grouting piles and the rock mass, and the bench soil to be excavated has bracing effect on the tunnel contour and has some influence on the contact pressure.

Key words: weak rock mass, doubletrack railway tunnel, predisplacement, spatial effect, “top heading + two benches”excavation method