›› 2010, Vol. 31 ›› Issue (S1): 383-387.

• Numerical Analysis • Previous Articles     Next Articles

Analysis of coupled seepage and stress of shield tunnel launching accident in soft clay

WEI Gang1，GUO Zhi-wei2，WEI Xin-jiang 1, 3，CHEN Wei-jun 1, 3   

  1. 1. Department of Civil Engineering, City College, Zhejiang University, Hangzhou 310015, China; 2. Henan Transportation Research Institute Co., Ltd., Zhengzhou 450006, China; 3. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
  • Received:2010-04-29 Online:2010-08-10 Published:2010-09-09

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Abstract:

The disaster causes of gushing water and sand during shield departure from shaft are analyzed; and the finite element model of shield departure construction is established using Midas-GTS software. Considering coupled seepage and stress of shield departure construction, the groundwater permeates from reinforced soil around underlying layer to wall is analyzed; and the settlement of the undisturbed soil in front of the reinforced soil is studied. An example is given to demonstrate that: supposing the reinforced soil is impervious, the accident that water and sand inflows from tunnel portal is influenced by length of soil reinforcement and groundwater level; increasing the length of reinforced soil is good for engineering safety; but the cost is high. Decreasing the groundwater level could reduce the disaster of gushing water and sand during shield departure from shaft. Reasonable construction parameters for a project are determined by taking into account of economy, security and time limit.

Key words: shield departure from shaft, coupled seepage and stress, soil reinforcement, groundwater level

CLC Number: 

  • U 456
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