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MODERN TUNNELLING TECHNOLOGY 2017, Vol. 54 Issue (2) :207-212    DOI:
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Application of Micro-Vibration Blasting Techniques for Hard Rock Tunnel Construction in Complex Environments
(The Seventh Engineering Co. Ltd. of CTCE Group, Hefei 230032)
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Abstract The Qingren running tunnel of Qingdao metro line 3 is located in a slightly weathered granite formation and passes underneath some preserved national historic buildings and an civil defense cavern group, with a very complex surrounding environment. To guarantee the safety of the ancient buildings and prevent the cavern group from collapsing, the safety criterion for blasting is verified by field tests; the tunnel may safely pass beneath the historic buildings and cavern group by using such measures as a large-diameter hollow cut hole, delayed ignition with a parallel cut, a millisecond delayed detonating network with different zones and pre-bored vibration attenuation holes.
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Keywords�� Micro-vibration blasting   Hard rock tunnel   Large-diameter hollow cut hole   Millisecond delayed deto? nation network   Spatio-temporal vibration reduction     
Abstract�� The Qingren running tunnel of Qingdao metro line 3 is located in a slightly weathered granite formation and passes underneath some preserved national historic buildings and an civil defense cavern group, with a very complex surrounding environment. To guarantee the safety of the ancient buildings and prevent the cavern group from collapsing, the safety criterion for blasting is verified by field tests; the tunnel may safely pass beneath the historic buildings and cavern group by using such measures as a large-diameter hollow cut hole, delayed ignition with a parallel cut, a millisecond delayed detonating network with different zones and pre-bored vibration attenuation holes.
Keywords�� Micro-vibration blasting,   Hard rock tunnel,   Large-diameter hollow cut hole,   Millisecond delayed deto? nation network,   Spatio-temporal vibration reduction     
Cite this article:   
.Application of Micro-Vibration Blasting Techniques for Hard Rock Tunnel Construction in Complex Environments[J]  MODERN TUNNELLING TECHNOLOGY, 2017,V54(2): 207-212
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