›› 2011, Vol. 32 ›› Issue (5): 1491-1494.

• Geotechnical Engineering • Previous Articles     Next Articles

Cumulative damage evaluation of clip rock in small-distance tunnels caused by blasting excavation and its application

MENG Fan-bing1, LIN Cong-mou1, CAI li-guang2 , LI bo3   

  1. 1. Research Institute of Geotechnical Engineering, Huaqiao University, Quanzhou, Fujian 362021, China; 2. Department of Civil Engineering, University of Mississippi, MS 38655, USA; 3. C&D Real Estate Corp. Ltd., Quanzhou, Fujian 361001, China
  • Received:2010-03-18 Online:2011-05-10 Published:2011-09-23

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Abstract: A new calculation method has been established in order to obtain the clip rock of small-distance tunnels blasting cumulative damage rule. The new method is applied to predict Dapingshan tunnel clip rock blasting cumulative damage during construction; at the same time a field test validation is carried out. The results show that: the new method can not only reflect the blasting of mechanical action process, and the calculated parameters are also easy to obtain; the prediction and measured average error is about 12%, which can be used to predict rock cumulative damage; Dapingshan tunnel clip rock cumulative damage rule is as follows: after the second blasting, 6 test holes velocity average drop rate is 4.3%; the largest test holes cumulated damage in increments is 6.1%. The results provide a basis for further small-distance tunnels clip rock stability studies.

Key words: blasting, cumulative damage, blast load

CLC Number: 

  • TD 235
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