›› 2011, Vol. 32 ›› Issue (6): 1843-1848.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of efficacy of systematic anchor bolts in highway tunnels

CHEN Li-hua1, 2, LIN Zhi 2, LI Xing-ping2   

  1. 1.College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. China Merchants Chongqing Communications Research & Design Institute Co., Ltd., Chongqing 400067, China
  • Received:2010-01-15 Online:2011-06-10 Published:2011-06-21

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Abstract: A support structure of systematic anchor bolts is a key part in the system of shotcrete-bolt suppcrts, and it is widely used in preliminary bracing of hiqhway tunnel at present. However, there is no effective quantitative way to calculate the role of the systematic anchor bolts for the stability of tunnel structure. Taking a certain expressway tunnel for example, the influence of anchor bolts on safety factors of tunnels under different geological conditions is calculated with FEM strength reduction method. Together with FEM numerical simulating and analysis to various kinds of effects from anchor bolts, conclusions can be drawn as follows. The anchor bolts have little influence on stability of expressway tunnel under much more geological conditions; therefore, it is suggested that experimental verification of canceling the systematic anchor bolts should be carried out gradually if possible, so as to provide more engineering basis for canceling anchor bolts in highway tunnels.

Key words: tunnel, finite element strength reduction, safety factor, systematic anchor bolts

CLC Number: 

  • U451
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