›› 2011, Vol. 32 ›› Issue (2): 537-541.

• Geotechnical Engineering • Previous Articles     Next Articles

Vibration effects on existing tunnel induced by blasting of an adjacent cross tunnel

YE Pei-xu, YANG Xin-an, LING Bao-lin, ZHANG Ye-wei   

  • Received:2009-11-17 Online:2011-02-10 Published:2011-02-16

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Abstract:

Based on the engineering that Nanshanxia Tunnel down-traversing Qiancangshan Tunnel of Wen-Fu Passenger Dedicated Line, the vibration effects on the existing tunnel caused by blasting of an adjacent cross tunnel have been monitored. The results of the tests show that: the position of blasting surface affects velocity distribution of the cross-section of existing tunnel; when the distance between vibration source and measuring points is more than 30 m, the main influence factor of vibration is distance; while it is less than 30 m, the main factors are the amount of dynamite and distance; the harder and more complete the rock is, the slower the attenuation of the propagation of blasting vibration wave is. Measures such as pilot tunnel blasting in advance of smooth blasting; pilot tunnel blasting that the initiation of cutting holes, periphery holes and bottom holes are separated; and controlling maximum explosive volume for single segment can weaken the impact of blasting vibration effectively and control the vibration effects on Qiancangshan Tunnel; it can be a reference for similar projects.

Key words: railway tunnel, cross tunnel, blasting vibration, vibration velocity, monitoring

CLC Number: 

  • U 452
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