›› 2012, Vol. 33 ›› Issue (7): 2081-2088.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Approximation method of tunnel longitudinal seismic analysis

ZHANG Bin-wei1, YAN Song-hong2, YANG Yong-dong1   

  1. 1. Institute of Geotechnical and Construction materials, Longdong University, Qingyang, Gansu 745000, China; 2. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
  • Received:2011-12-30 Online:2012-07-11 Published:2012-07-13

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Abstract: According to the features of tunnel engineering, interaction between tunnel and wall rock is considered. Based on structural dynamics theory, interaction theory and the idea of equivalent radius, a dynamic equilibrium equation of tunnel structure is established. The equation takes into account the action of inertial force of the tunnel structure. As can be seen from the equation, classical displacement response method is a special case of the method. Factors effecting on longitudinal stress of tunnel lining have been studied. Those factors contain tunnel depth, strata shear wave velocity, shear wave direction, elastic foundation coefficient, elastic modulus and the characteristic period of the overlying strata. The case studies show that: (1) Interaction between structure and wall rock has a greater impact on lining. Without considering the interaction, the results are relatively conservative. (2) Inertial force has a great effect on the ultra shallow structure; but with the tunnel depth increases, the impact of inertial force can be neglected. (3) The method is actually an engineering algorithm for solving tunnel longitudinal stress. In the preliminary design of tunnel, the method could provide theoretical reference for seismic concept design of the overall tunnel.

Key words: tunnel engineering, longitudinal seismic analysis, stratum deformation, interaction between tunnel and wall rock

CLC Number: 

  • U 451
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