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Stress analysis of primary support arch cover excavation in metro station based on 3D geomechanical model experiment

  • Wei Li
  • Qingsong Zhang
  • Ren-tai Liu
  • Lianzhen Zhang
  • Kexian Li
  • Shijie Zhang
Original Paper
  • 71 Downloads

Abstract

By considering a certain subway station of Qingdao Metro Line 1 as the research object, a 3D geomechanical model was established to analyze the stress and deformation characteristics of the surrounding rocks of a large-span subway underground station under primary support arch cover excavation. Fiber grating sensors, resistance strain gauges, earth pressure gauges, and multipoint displacement meters were arranged to monitor changes in stress and displacement of surrounding rock masses in the tunnel. The vault surrounding rock experiences excavation disturbance and rapid release stress, which consequently stabilizes. The excavation response of the arch foot to the monitoring section is gentler than the vault stress. Further, the horizontal stress of the sidewall sustains slow release, and the primary support stress increases rapidly, slows down, and finally stabilizes. The initial stress of the initial branch increases slightly after the first rapid growth, and the final trend is stable. During the process of advancing of the tunnel face, deformation undergoes three main stages, namely, slow, abrupt, and stable deformation, with continuing arch cover excavation. Although the surface subsidence is consistent with the vault subsidence, it has a lower value than the vault subsidence. The influence of the surface subsidence caused by excavation is larger than that of the vault subsidence, and the influence of axial subsidence on the tunnel is approximately 15 m. The primary support arch cover excavation can be successfully applied to large-span hard-rock metro stations whose surrounding rock grade is II–III; this provides a theoretical basis and reference for similar projects.

Keywords

3D geomechanical model Primary support arch cover excavation Mechanical mechanism Surrounding rock deformation 

Notes

Acknowledgements

The authors would like to express great appreciation to the reviewers for their valuable comments and suggestions that helped to improve the quality of the paper.

Funding information

This study was financially supported by the National Natural Science Foundation of China (U1706223), the National Key Research and Development Program of China (2016YFC0801604), and the China National Funds for Distinguished Young Scientists (51799158).

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Wei Li
    • 1
  • Qingsong Zhang
    • 1
  • Ren-tai Liu
    • 1
  • Lianzhen Zhang
    • 2
  • Kexian Li
    • 3
  • Shijie Zhang
    • 4
  1. 1.Research Center of Geotechnical and Structural EngineeringShandong UniversityJinanChina
  2. 2.College of Pipeline and Civil EngineeringChina University of PetroleumQingdaoChina
  3. 3.Qingdao Metro Group CorporationQingdaoChina
  4. 4.China Railway Academy Co. LtdChengduChina

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