›› 2011, Vol. 32 ›› Issue (9): 2803-2809.

• Numerical Analysis • Previous Articles     Next Articles

Research on construction procedure for shallow large-span tunnel undercrossing highway

LI Jian1，TAN Zhong-sheng1，YU Yu2，NI Lu-su1   

  1. 1. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China; 2. The Second Survey and Design Institute of China Railway, Chengdu 610031, China
  • Received:2010-05-31 Online:2011-09-10 Published:2011-09-13

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Abstract: Wenxiang tunnel for Zheng-Xi Special Passenger Railway has been done a series of research on optimizing the construction method for shallow large-span loess tunnel. According to the field monitoring of ground settlement, vault settlement and primary support stress of the tunnel section before tunnel undercrossing the Lian-Huo expressway. The result indicates that soil settlement and primary support stress can not be controlled very well; and the current construction scheme needs to be reformed since it can not satisfy construction safety requirement. Through synthetical analysis, some optimized methods such as reducing excavation area, increasing excavation steps of pilot tunnel, reserving core soil, quick closure, reinforcing primary support, etc. have been used in construction; and their security and reliability are verified by numerical analysis software fast Lagrangian analysis of continua in 3 dimensions (FLAC3D). From feedback of field implement and monitoring result, the effect of optimized methods is significant; and these methods ensure the undercrossing project implements successfully. These research results have high referential value for analogous project to control soil settlement and protect the safety of neighbouring building facilities

Key words: shallow burying mining, undercrossing construction, loess tunnel, field monitoring, construction optimization

CLC Number: 

  • U 456.3
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