›› 2011, Vol. 32 ›› Issue (4): 1108-1112.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of influence of water discharge volume on lining external loads for discharge segment lining

YAN Qi-xiang，MA Ting-ting，CHEN Fei   

  1. Department of Underground Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2010-07-26 Online:2011-04-10 Published:2011-04-29

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Abstract:

The design idea of solving high-water pressure effect on railway tunnels is brought forward by using water releasing segment lining. Considering the influence of seepage field on stress field of the ground field, the external loads calculation formula of segment lining by treating water load as permeation bulk forces are established; the interrelations between infiltration coefficient of surrounding rock and maximum discharge volume, the interrelations between controlled discharge volume and contact stress behind the lining are discussed; and the influence laws of surrounding rock conditions on effective stress and contact stress behind the segment are studied. Finally, the method is contrasted with a simple method which calculates segment lining external loads through treating far-field water loads as surface forces in order to evaluate the feasibility of the simple method. The results show that two calculation results by treating water load as surface forces and permeation bulk forces have a good approach only in given conditions, so the former method only can be a reference in selecting segment lining external loads

Key words: high-water pressure railway tunnel, discharge segment lining, permeation bulk forces, discharge volume, external loads of lining

CLC Number: 

  • O 319.56
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