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Blasting Control Techniques for an Urban Hard-Rock Tunnel Passing Under Brick-Wood Buildings
(1 State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590;
2 No.2 Co. Ltd. of China Railway Tunnel Group, Sanhe 0652012)
Abstract A running tunnel of lot 3 of the Qingdao metro line 3 passed under a dental hospital of the First Sanitarium of the Jinan Military Region at a depth of 14m. To minimize the impact from blasting vibrations, large diameter hollow-cylinder cutting and controlled maximum priming charge per delay were used as countermeasures in the excavation. In this way, the vibration velocity of the ground surface was controlled within 1.5cm/s and the safety of the ground buildings and main roads nearby was guaranteed. Meanwhile, using the outer-hole delaying technique, the optimized blasting network reduced the blasting times induced by the detonator segments and shortened the blasting duration, resulting in social and economic benefits.
Abstract：
A running tunnel of lot 3 of the Qingdao metro line 3 passed under a dental hospital of the First Sanitarium of the Jinan Military Region at a depth of 14m. To minimize the impact from blasting vibrations, large diameter hollow-cylinder cutting and controlled maximum priming charge per delay were used as countermeasures in the excavation. In this way, the vibration velocity of the ground surface was controlled within 1.5cm/s and the safety of the ground buildings and main roads nearby was guaranteed. Meanwhile, using the outer-hole delaying technique, the optimized blasting network reduced the blasting times induced by the detonator segments and shortened the blasting duration, resulting in social and economic benefits.
YANG ,
Qing-1,
Wang-Hai-Liang-1 etc
.Blasting Control Techniques for an Urban Hard-Rock Tunnel Passing Under Brick-Wood Buildings[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(1): 199-202
2014, Vol. 51 