›› 2010, Vol. 31 ›› Issue (2): 577-581.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of deformation controlling measures for large-span shallow tunnel

WEI Long-hai1, WANG Ming-nian2, ZHAO Dong-ping2, JI Yan-lei2   

  1. 1. The Second Highway Survey, Design and Research Institute, China Communications, Wuhan 430056, China; 2.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2008-08-25 Online:2010-02-10 Published:2010-03-24

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Abstract:

Xiang’an subsea tunnel is the first subsea tunnel in China; and its geological conditions are complex and unfavorable with enriched groundwater. During the tunnel construction, the deformation of tunnel support is great; and it has brought the bad-effect on the construction of quadric lining; moreover, the large deformation maybe bring on the surrounding rock collapse. It is important to seek for a reasonable countermeasure to restrict the large deformation to ensure safety construction. Focused on Xiang’an subsea tunnel, field monitoring data and construction annel are analyzed and numerical calculation is employed. Some measures and its combination against abnormal deformation during the tunnel construction are taken. The analytical results indicate that, to some extent, the countermeasure including setting locking anchor pipe, enhancing stiffness and intensity of temporary support, constructing continuous wall for groundwater proof, can decrease the displacements of the tunnel support. But the effection of using the combination project is better during constructing the large-span tunnel in the complex geological conditions. For example, after adopting the seventh combination project, arch crown settlement will be reduced 46-60%; and horizontal convergence will be reduced about 30%. The analytical method and result can provide references to the other similar engineering cases.

Key words: subsea tunnel, monitoring measurement, structure deformation, large-span tunnel

CLC Number: 

  • U 451
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