›› 2005, Vol. 26 ›› Issue (11): 1727-1730.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Approach to earth balance pressure of shield tunneling across ultra-near metro tunnel in operation

LIAO Shao-ming1, YANG Jun-long2, XI Cheng-lei1, PENG Fang-le1, HOU Xue-yuan1   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Shanghai Second Municipal Engineering Construction Co, Ltd, Shanghai 200092, China
  • Received:2004-10-14 Online:2005-11-10 Published:2014-01-03

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Abstract: The affecting factors and sensitivity of the displacement fields produced by the shield tunneling across the ultra-near tunnel obviously differ from that of the general construction. Combining the metro tunneling examples within ultra-near distance (1.05 m)in Shanghai, It is found that the earth pressure varies significantly while shield approaching to adjacent metro tunnel in operation situated overhead. Based on the principles of tunnel loading model and theory of elasticity a, theoretical formula of earth balance pressure of shield was deduced and a so-called “step control strategy” was concluded which was successfully applied in a typical project of Shanghai metro tunnel line No.4 of which the maximum displacement was controlled within 5 mm. The field measurements of earth pressure proved to be at good coincidence with the theoretical values.

Key words: metro tunnel, shield, ultra-near construction, earth balance pressure

CLC Number: 

  • U 45
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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