Journal of Northeastern University:Natural Science ›› 2013, Vol. 34 ›› Issue (1): 135-139.DOI: -

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Application of Isolation Piles on Metro Tunnel for Side-Crossing the Buildings with Shallow Foundation

JI Xin-bo1, ZHAO Wen1, LI Shen-gang1, ZHOU Zuo-shun2   

  1. 1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China; 2. Tianjin Municipal Engineering Design and Research Institute, Tianjin 300051, China.
  • Received:2012-07-10 Revised:2012-07-10 Online:2013-01-15 Published:2013-01-26
  • Contact: JI Xin-bo
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Abstract: The mechanical behavior and deformation of a metro tunnel using isolation piles adjacent to existing buildings with shallow foundation were studied with orthogonal finite element analysis method. Comparative analysis was implemented to examine:the settlement at the surface of existing building, the isolating effect of isolation piles and effectiveness of grouting on tunnel stability. Orthogonal finite element analysis was adopted to optimize three main parameters of isolation piles. The present results indicated that the existing building changes the shape of settlement trough and increases the inter-force and deformation. Isolation piles and grouting have some control on the deformation and inter-force of supporting structures. The optimal parameters of isolation piles are 33m in length, 0.5m in longitudinal spacing, and the distance between piles and tunnel is 1.5m. This kind of optimization may provide references for the similar construction design.

Key words: tunnel construction near the building, isolation piles, orthogonal finite element analysis, tunnel stability, supporting interforce, surface settlement

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