Attenuation of blast wave in a large-section tunnel

ZHANG Xuemin; ZHOU Xianshun; WANG Lichuan; YANG Guofu; FENG Han; GAO Xiang; MA Mingzheng

doi:10.11883/bzycj-2019-0045

Volume 40 Issue 2

Jan. 2020

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ZHANG Xuemin, ZHOU Xianshun, WANG Lichuan, YANG Guofu, FENG Han, GAO Xiang, MA Mingzheng. Attenuation of blast wave in a large-section tunnel[J]. Explosion And Shock Waves, 2020, 40(2): 025101. doi: 10.11883/bzycj-2019-0045

Citation:

ZHANG Xuemin, ZHOU Xianshun, WANG Lichuan, YANG Guofu, FENG Han, GAO Xiang, MA Mingzheng. Attenuation of blast wave in a large-section tunnel[J]. Explosion And Shock Waves, 2020, 40(2): 025101. doi: 10.11883/bzycj-2019-0045

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Attenuation of blast wave in a large-section tunnel

doi: 10.11883/bzycj-2019-0045

ZHANG Xuemin^{1, 2},
ZHOU Xianshun^{1, 2},
WANG Lichuan^{1, 3
,
,},
YANG Guofu^{1, 4},
FENG Han^{1, 2},
GAO Xiang^{1, 2},
MA Mingzheng⁵

1.
School of Civil Engineering, Central South University, Changsha 410075, Hunan, China
2.
MOE Key Laboratory of Engineering Structure of Heavy Haul Railway (Central South University), Changsha 410075, Hunan, China
3.
China Railway Chengdu Group Company Limited, Chengdu 610082, Sichuan, China
4.
Shenzhen Municipal Design & Research Institute Company Limited, Shenzhen 518029, Guangdong, China
5.
Sichuan-Tibet Railway Sichuan Company Limited, Chengdu 610043, Sichuan, China

Received Date: 2019-02-18
Rev Recd Date: 2019-08-27

Available Online: 2020-01-25

Publish Date: 2020-02-01

Abstract

Abstract

The blasting air shock wave produced by tunnel excavation results in considerable casualties and damage to equipments and environments. Compared with those of the explosion of bare charges, the influencing factors of the blast wave induced by tunnel drilling are more complicated, so it is of considerable significance to study its attenuation law for taking appropriate protective measures. In this paper, a field test of blasting shock wave was carried out during the drilling and blasting of a large cross-section tunnel with a speed of 350 km/h, and the propagation law and influence factors of blasting shock wave under different conditions were analyzed. The results display that there are multiple overpressure peaks with different amplitudes in the shock wave overpressure-time curve, showing the short time intervals with significant millisecond delay characteristics between wave peaks. When the shock wave propagates to the far field, it does not form a stable plane wave, and it is different from the propagation law of shock wave of the single charge explosion. The shock wave overpressure signal is superimposed by multiple sub-signals, showing typical time domain properties, and the number of sub-signals is the same as that of the millisecond delay detonator segments. Under the same blasting conditions, the conversion factor of emulsion explosive energy into shock wave in a large-section tunnel is smaller than that in a small-section tunnel. Compared with the total charge and the maximum charge, the linear correlation between the peak values of shock wave overpressure calculated by the cut-hole charge and the measured peak values is the strongest. Then the maximum peak value of the blasting shock wave overpressure should be determined according to TNT equivalent of the cut-hole charge. Obstacles such as the large equipment in the tunnel will change the propagation law of the shock wave, showing a significant superimposed amplification effect.
- large-section tunnel,
- borehole blasting,
- millisecond delay blasting,
- shock wave overpressure

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References(15)

References

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