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Journal of Mountain Science

, Volume 10, Issue 6, pp 1125–1136 | Cite as

In situ experiments on supporting load effect of largespan deep tunnels in hard rock

  • Ben-guo HeEmail author
  • Yong-quan Zhu
  • Ming-lei Sun
  • Hong-yan Liu
  • Zhi-qiang Zhang
Article
  • 156 Downloads

Abstract

A section of the Nanliang high speed railway tunnel on Shijiazhuang-Taiyuan high-speed passenger railway line in China was instrumented and studied for its mechanical properties and performances. The cross section for the tunnel was 300 m2 and is classified as the largest cross section for railway tunnels in China. Through in situ experimental studies, mechanistic properties of the tunnel were identified, including the surrounding rock pressure, convergences along tunnel perimeter and safety of primary support and lining structure. Based on the field measured data, the surrounding rock pressure demand for large-span deep tunnel in hard rock is recommended as double peak type in the vertical direction and fold line type was recommended for horizontal pressure. The results suggested that Promojiyfakonov’s theory was most close to the monitored value. Specific recommendations were also generated for the use of bolts in tunnel structures. Numerical simulation was used to evaluate the safety of the tunnel and it confirmed that the current design can satisfy the requirement of the current code.

Keywords

Large-span tunnel Railway tunnel Surrounding rock pressure Load distribution In situ experiment 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Ben-guo He
    • 1
    Email author
  • Yong-quan Zhu
    • 1
  • Ming-lei Sun
    • 1
  • Hong-yan Liu
    • 2
  • Zhi-qiang Zhang
    • 3
  1. 1.School of Civil EngineeringShijiazhuang Tiedao UniversityShijiazhuangChina
  2. 2.Department of Civil and Environmental EngineeringColorado School of MinesGoldenUSA
  3. 3.School of Civil EngineeringSouthwest Jiaotong UniversityChengduChina

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