›› 2004, Vol. 25 ›› Issue (3): 477-480.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Finite element simulation of whole excavation operation of a unequal-span double-arch tunnel

DENG Jian1，ZHU He-hua2，DING Wen-qi2   

  1. 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China； 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
  • Received:2002-12-09 Online:2004-03-10 Published:2014-07-15

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Abstract: The whole excavation operation of a highway unequal-span double-arch tunnel is simulated by a finite element software called GeoFBA2D. This highway unequal-span double-arch tunnel consists of a big tunnel and a small tunnel. Attentions are mainly focused on the stress and displacement of the surrounding rock mass, the stress between the first linings and the second linings, and the stress and displacement of middle-wall so on. The results show that the maximum tensile stress of the big tunnel vault is 4 times of that of the small tunnel. The effect of unequal-span double-arch’s performances are quite distinct. The displacement of small tunnel vault can be divided into three obvious stages: before the excavation of small tunnel; during the excavation and lining of small tunnel; during the excavation and lining of big tunnel. The stress between the first and second lining of the small tunnel is smaller than that of the big tunnel. The stress and displacement of middle-wall varies with the construction process, but the ultimate displacement values are very small.

Key words: unequal-span double-arch tunnel, whole excavation operation, finite element simulation, stress, displacement

CLC Number: 

  • TU 451
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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