›› 2012, Vol. 33 ›› Issue (4): 1109-1116.

• Geotechnical Engineering • Previous Articles     Next Articles

Field measurement and analysis of effect of excavation on existing tunnel boxes of underlying metro tunnel in operating

ZHENG Gang1, 2，LIU Qing-chen1, 2，DENG Xu1, 2，ZHANG Li-ming1, 2   

  1. 1. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China; 2. School of Civil Engineering, Tianjin University, Tianjin 300072, China
  • Received:2010-06-28 Online:2012-04-13 Published:2012-04-26

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Abstract: The Xiqing Road Tunnel of Tianjin West Railway Station Hub crosses over the existing tunnel boxes of the operating Tianjin Metro Line 1. The bottom plate of the Xiqing Road Tunnel is just 0.3 m away from the upper plate of the existing tunnel boxes, so the deformation of existing metro tunnel due to construction should be controlled strictly. The design bring forward some pertinence construction plans and measures, including ground improvement, excavation in sections and back pressure of heaped load timely. Base on the analysis of monitoring data during the construction and excavation of anti-floating piles and triaxial cement mixing pile of Xiqing Road Tunnel adjacent to the existing metro tunnel, and the corresponding deformation rules and characteristics in the different stages are summarized. The measured results show that the construction of bored piles adjacent to the existing metro tunnel could lead to the tunnel settlement, while the excavation could cause the heave of the tunnel. Due to excavation in sections, Back pressure of heaped load as well as the observational method, the vertical deformation of existing tunnel caused by excavation and the different deformation between the two adjacent boxes can be controlled effectively.

Key words: operating metro line, excavation, ground improvement, back pressure of heaped load, deformation control

CLC Number: 

  • TU 443
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