›› 2009, Vol. 30 ›› Issue (2): 563-566.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on vertical deformation of down shotcrete tunnel during unloading of pit excavation

LI Dong-hai, LIU Jun, NIU Xiao-kai, DING Zhen-ming, ZHAO Zhi-tao   

  1. Beijing Municipal Engineering Research Institute, Beijing 100037, China
  • Received:2007-04-19 Online:2009-02-10 Published:2011-01-27

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Abstract:

According to existing analysis methods, the vertical deformation of down tunnel has been predicted and reached different results. But it is proved by in-site measuring that the vertical deformation of down tunnel behaves in different time-space laws because of quick excavation. It is important to take into account time-space effect when the vertical deformation of down shotcrete tunnel happens. Velocity and mode of deep-dip excavation is one of key factors of vertical deformation. Based on analysis and study of in-site measuring data, some useful experience and lesson has been concluded. It may be useful reference to similar engineering in future.

Key words: unloading of pit excavation, shotcrete tunnel, vertical deformation, time-space effect

CLC Number: 

  • U 451
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