›› 2011, Vol. 32 ›› Issue (9): 2747-2752.

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of evolution process of rock collapse on top of middle wall in an extremely shallow double arch tunnel

LI Ying-yong1，FENG Xian-da2，LI Shu-cai2，LI Shu-chen2，YUAN Chao2，LI Xin-zhi2，XU Qin-jian2   

  1. 1. Highway Bureau, Shandong Provincial Department of Communications, Jinan 250002, China; 2. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China
  • Received:2011-04-01 Online:2011-09-10 Published:2011-09-13

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Abstract: Middle wall is the main bearing component of the double arch tunnel. Non-dense backfill on the top of the middle wall can easily lead to large deformation or collapse of surrounding rocks. In response to this phenomenon, we developed a similar model material and the test equipment and carried out the corresponding destructive model test, by which the evolution process of the collapse was studied. The whole process of collapse has been reproduced by UDEC simulation; and the numerical results are in good agreement with the model test. Collapse mechanism has been derived from the distribution of displacement and plastic zones. Finally, we propose targeted prevention measures which are of reference value for similar projects.

Key words: double arch tunnel, middle wall, evolution process of collapse, UDEC

CLC Number: 

  • TU 457
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