Similarity model test study of pre-reinforcement measures of shallow tunnel with large cross-section

LI Hua-yun; ZHANG Zhi-qiang; WANG Zhi-jie; LING Yun-peng; ZHANG Hao

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Similarity model test study of pre-reinforcement measures of shallow tunnel with large cross-section

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- Similarity model test study of pre-reinforcement measures of shallow tunnel with large cross-section
- Vol. 33, Issue S2, (2012)
- 作者机构：
  
  西南交通大学土木工程学院地下工程系,成都,610031
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU453
- Online First：11 December 2012，
  
  Published：2012
- 稿件说明：
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LI Hua-yun, ZHANG Zhi-qiang, WANG Zhi-jie, et al. Similarity model test study of pre-reinforcement measures of shallow tunnel with large cross-section[J]. 2012, 33(S2).
DOI：

LI Hua-yun, ZHANG Zhi-qiang, WANG Zhi-jie, et al. Similarity model test study of pre-reinforcement measures of shallow tunnel with large cross-section[J]. 2012, 33(S2). DOI：

摘要

以京沪高铁西渴马1号隧道为工程背景，采用室内相似模型试验研究管棚和双排小导管预加固措施的加固效果。通过分析开挖过程中不同预加固措施下围岩应力和位移的变化规律，得到以下结论，（1）在隧道轴向上，管棚和双排小导管支护起到了梁的作用，能很好地控制上方岩土体由于隧道开挖而导致的松动，且减少掌子面上方围岩应力，保证掌子面的稳定性；（2）在隧道横向上，管棚和双排小导管能与周围的岩体形成承载拱，可限制上部围岩应力释放，提高支护结构的安全性；（3）管棚的纵向梁效应要强于双排小导管，但双排小导管的横向拱效应要强于管棚。

Abstract

Taking the Xikema no.1 tunnel as engineering background

the reinforcement effect of pre-reinforcement measures including pipe-roof and double-row small duct

is studied through the model test. Some useful conclusions are drawn by analyzing the change law of stress and displacement of surrounding rock in different pre-reinforcement measures during the excavation

The research results show that: (1) In the tunnel longitudinal direction

pipe-roof and double-row small duct play a role of supporting beams; they can primely control the above surrounding rock loose caused by tunnel excavation and reduce surrounding rock stress above the work face

so as to guarantee the stabilization of the work face. (2) In the tunnel on the transverse

pipe-roof and double-row small duct can form into a complex well with surrounding rock

which plays a role of load-bearing arch to limit the above surrounding rock stress release and improve the safety of the supporting structure. (3) The longitudinal beam effect of pipe-roof is stronger than double-row small duct; but the transverse arch effect is weaker than double-row small duct.

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