›› 2009, Vol. 30 ›› Issue (9): 2815-2822.

• Numerical Analysis • Previous Articles     Next Articles

Analysis of blasting vibration response of parallel set small clear-distance tunnels and blasting control measures

YAO Yong1, 2, HE Chuan2   

  1. 1. School of Civil Engineering, Southwest University of Science and Technology, Mianyang 621002, China; 2. Department of Tunnel and Underground Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2008-04-01 Online:2009-09-10 Published:2010-03-24

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Abstract:

Effects of surrounding rock, clear-distance and buried depth on blasting vibration characteristics of small clear-distance tunnel are analyzed by two and three-dimensional numerical simulations; and effects of blasting in lately excavated tunnel on early excavated tunnel are studied for different support systems, reinforcement measures of middle wall of early excavated tunnel and different construction plans of lately excavated tunnel. According to research results, such blasting control measures of tunnel construction are provided that middle wall should be reinforced by grouting, and primary support of early excavated tunnel should be closed down in time; and hole cut should be far away from middle wall and advance should not greater than one-third of clear-distance. All measures can be for reference in design and construction for blasting excavation of small clear-distance tunnels.

Key words: tunnel engineering, small clear-distance tunnel, blasting vibration, blasting control measures

CLC Number: 

  • O 389
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