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.
.Application of Micro-Vibration Blasting Techniques for Hard Rock Tunnel Construction in Complex Environments[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(2): 207-212
2017, Vol. 54 