Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1797-1803.doi: 10.13278/j.cnki.jjuese.20170280

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Characteristic Analysis on Stress Ratio of Unsymmetrical Load Tunnel

Yu Qingyang, Liu Wei, Nie Lei, Dai Shulin   

  1. College of Construction Engineering, Jilin University, Changchun 130026, China
  • Received:2017-10-10 Published:2018-11-26
  • Supported by:
    Supported by Project of Jilin Transportation Science and Technology (2014-4-1-10-3)

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Abstract: Unsymmetrical load tunnel is a common type encountered in highway and railway construction. Because of its stress features, it is difficult to design and construct unsymmetrical load tunnel. Many researches focus mainly on stress distribution of unsymmetrical load tunnel, the causes of unsymmetrical load tunnel, surrounding rock stability, stress and strain distribution and construction affection etc. Seldom study focus on unsymmetrical load stress ratio and on conditions of unsymmetrical load stress ratio under the condition given of highway and railway design code. In this paper, based on the critical grade and coverage depth corresponding to the condition of the design code of double track railway tunnels, the stress ratios of the symmetrical position of the tunnel were calculated by means of numerical simulation. The results show that:under the premise of safety,when the stress ratio at arch shouldesr of grade Ⅲ surrounding rock is greater than 7.45,the stress ratio of grade Ⅳ(soil)surrounding rock is greater than 2.23,the stress ratio of grade Ⅳ(rock)surrounding rock is greater than 3.34,and the stress ratio of grade Ⅴ surrounding rock is greater than 1.06,the tunnel can be considered as an unsymmetrical load tunnel. The quantitative analysis results under the condition of railway tunnel design code provide a theoretical basis for the quantitative identification of the unsymmetrical load tunnel.

Key words: unsymmetrical load tunnel, unsymmetrical stress ratio, critical slope, overburden depth

CLC Number: 

  • TU457
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