›› 2009, Vol. 30 ›› Issue (7): 2021-2026.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Aseismic and seism-reducing modeling study for entrance of two-track tunnels

SUN Tie-cheng 1, 2, GAO Bo1, WANG Zheng-zheng1   

  1. 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. School of Civil Engineering, Shijiazhuang Railway University, Shijiazhuang 050043, China
  • Received:2008-05-21 Online:2009-07-10 Published:2011-03-10

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Abstract:

An aseismic modeling test of the entrance of two-track tunnels is carried out in laboratory, in order to learn about the dynamic response of tunnel-liner and the effect of seism-reducing layer on tunnel-liner security and rock-slope stability during earthquakes. In this modeling test, two cases with and without seism-reducing layer respectively, are executed to analyze the behaviors of seism-reducing layer. The measured results show that: (1) the seism-reducing layer can reduce the destruction degree of surrounding rock, exhibiting no effect on their destruction mode; (2) the seism-reducing layer exerts more effect on the stress distribution under earthquake action and diminishes the force loaded on tunnel liner to some extent; (3) for the tunnel entrance with unequal mileage, the tunnel-liner of long mileage tunnel is sustained more complicated stresses around the cross-section containing the tunnel entrance with short mileage, and the seism-reducing layer is able to relieve the destruction degree of tunnel-liner near that cross-section effectively.

Key words: two-track tunnels, earthquake, seism-reducing layer, dynamic modeling test

CLC Number: 

  • U456
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