ISSN 2096-4498

   CN 44-1745/U

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Tunnel Construction ›› 2015, Vol. 35 ›› Issue (6): 491-499.DOI: 10.3973/j.issn.1672-741X.2015.06.001

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Analysis on Combination Mode and Parameters of Primary Support of  Shallowburied LargeSpan Tunnel: Case Study on  Xinggongjie Station Tunnel on No. 2 Line of Dalian Metro

SONG Chaoye1, TU Hongliang2, QIAO Chunsheng2   

  1. (1. China Railway Tunnel Survey & Design Institute Co., Ltd., Tianjin 300133, China; 2. School of  Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)
  • Received:2014-11-17 Revised:2015-02-27 Online:2015-06-20 Published:2015-06-25

Abstract:

There have been few shallowburied Metro tunnels with doublelayer primary support. Therefore, there is little experience in the selection of combination mode and thickness of the doublelayer support. In this paper, the influence of the combination mode and stiffness ratio of doublelayer support on the surrounding rock pressure and ground surface settlement is studied by means of field monitoring and numerical simulation, with Xinggongjie Station tunnel on No. 2 Line of Dalian Metro as an example. The study shows that: 1) Of the three combination modes including “double lattice girder layers”, “outerlayer shaped steel+innerlayer lattice girder” and “outerlayer lattice girder+innerlayer shaped steel”, the combination mode of “outerlayer lattice girder+innerlayer shaped steel” is most suitbale to Xinggongjie Station tunnel, and the rational outerlayer support thickness is 35 cm and the rational innerlayer support thickness is 20 cm; 2) The outerlayer primary support is the main loadbearing structure, and the surrounding rock pressure born by the outerlayer support increases as the ratio of the stiffness of the outerlayer support to that of the innerlayer support increases; The innerlayer primary support is the secondary loadbearing structure, and the surrounding rock pressure born by the innerlayer support reduces as the ratio of the stiffness of the outerlayer support to that of the innerlayer support increases. 

Key words: Dalian Metro, shallowburied largespan tunnel, doublelayer primary support, field monitoring, numerical simulation, stiffness ratio

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