土工基础

土工基础 ›› 2019, Vol. 33 ›› Issue (6): 650-654.

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软弱围岩隧道原位扩建开挖方案优化研究

针对后祠隧道原位2扩4软弱围岩段原CRD扩挖方案工序复杂，临时支撑拆除风险高，施工进度缓慢等弊端，提出优化的三台阶法施工方案，并通过数值模拟与现场监测相结合的方法进行分析验证。结果表明，软弱围岩中，大断面隧道原位扩建开挖方法采用台阶法扩挖是可行的，且隧道采用优化方案顺利完成施工并通车。相关研究为类似原位扩建隧道工程的设计施工具有重要指导和借鉴作用。   

  1. （福建厦蓉高速公路漳龙段扩建工程有限公司，福建龙岩 364000）
  • 收稿日期:2019-08-31 修回日期:2019-10-25 出版日期:2019-12-28 发布日期:2019-12-28
  • 作者简介:钟元庆（1972-），男，高级工程师，研究方向为高速公路规划和建设管理。
  • 基金资助:
    福建省交通运输科技项目（编号201404）

Optimization Study on Widening Excavation of an Existing Tunnel in Weak Rock Mass

The existing Housi Tunnel had two tunnel tubes in the weak rock mass, and it was decided to widen this tunnel into four tubes. The proposed CRD method had the disadvantages of complex excavation procedures, a relative high risk of temporary supporting system removal and longer construction schedule. The benching tunneling method was proposed to replace the CRD excavation method. The proposed benching tunneling procedure was simulated through numerical analysis and was verified through the construction monitoring. The results indicated that, the benching tunneling method is feasible for the excavation of large cross section tunnel and optimized excavation procedure used in the construction was successful.   

  1. (ZhangzhouLongyan Section Widening Engineering Co., Ltd. of XiamenChengdu Expressway, Longyan 364000)
  • Received:2019-08-31 Revised:2019-10-25 Online:2019-12-28 Published:2019-12-28

摘要： 针对后祠隧道原位2扩4软弱围岩段原CRD扩挖方案工序复杂，临时支撑拆除风险高，施工进度缓慢等弊端，提出优化的三台阶法施工方案，并通过数值模拟与现场监测相结合的方法进行分析验证。结果表明，软弱围岩中，大断面隧道原位扩建开挖方法采用台阶法扩挖是可行的，且隧道采用优化方案顺利完成施工并通车。相关研究为类似原位扩建隧道工程的设计施工具有重要指导和借鉴作用。

关键词: 隧道原位扩建, 软弱围岩, 方案优化, 台阶法

Abstract: The existing Housi Tunnel had two tunnel tubes in the weak rock mass, and it was decided to widen this tunnel into four tubes. The proposed CRD method had the disadvantages of complex excavation procedures, a relative high risk of temporary supporting system removal and longer construction schedule. The benching tunneling method was proposed to replace the CRD excavation method. The proposed benching tunneling procedure was simulated through numerical analysis and was verified through the construction monitoring. The results indicated that, the benching tunneling method is feasible for the excavation of large cross section tunnel and optimized excavation procedure used in the construction was successful.

Key words: Widening of Existing Tunnel, Weak Rock Mass, Excavation Optimization, Benching Tunneling Method