A precisely-controlled blasting method and vibration analysis for tunnel excavation under dense buildings

Gong Min; Wu Hao-jun; Meng Xiang-dong; Li Yong-qiang

doi:10.11883/1001-1455(2015)03-0350-09

Volume 35 Issue 3

Jun. 2015

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Article Navigation > Explosion And Shock Waves > 2015 > 35(3): 350-358

Gong Min, Wu Hao-jun, Meng Xiang-dong, Li Yong-qiang. A precisely-controlled blasting method and vibration analysis for tunnel excavation under dense buildings[J]. Explosion And Shock Waves, 2015, 35(3): 350-358. doi: 10.11883/1001-1455(2015)03-0350-09

Citation:

Gong Min, Wu Hao-jun, Meng Xiang-dong, Li Yong-qiang. A precisely-controlled blasting method and vibration analysis for tunnel excavation under dense buildings[J]. Explosion And Shock Waves, 2015, 35(3): 350-358. doi: 10.11883/1001-1455(2015)03-0350-09

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A precisely-controlled blasting method and vibration analysis for tunnel excavation under dense buildings

doi: 10.11883/1001-1455(2015)03-0350-09

1.
School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Chongqing Urban Construction Holding(Group)Co., Ltd, Chongqing 400013, China
3.
Chongqing Juneng Construction Group Co., Ltd, Chongqing 404100, China

Received Date: 2014-04-25
Rev Recd Date: 2014-12-09
Publish Date: 2015-05-25

Abstract

Abstract

To meet higher security requirements for blasting vibration from urban tunnel excavation under dense buildings, a new blasting technology was proposed and the corresponding method for obtaining parameters was explored.The proposed blasting technology uses non-electric detonators to precisely control blasting vibration.Chongqing Yuzhong connecting tunnel was taken as the research background.By applying Fourier function and MATLAB software, the vibration velocity curves were fitted for single-hole blasting with different charges and the quantification data of vibration superposition at different millisecond intervals from 1 to 50 ms were analyzed.The vibration-reduction effect was discussed for different millisecond intervals.The parameters about blasting charge and detonating time delayed were determined under given vibration velocities.Interval characteristics of each period between detonators in the field were measured and analyzed.Accordingly, the blasting scheme was designed, which using hole-by-hole cut blasting to control vibration.The blasting vibration velocity measured in the field is below 1.00 cm/s, and the corresponding reasonable single-hole charge is 1.2 kg for avoiding vibration superposition.The vibration velocity peak occurs after the detonation of the first or second-period detonator in the main cut area, which is consistent with the theoretical results.And the vibration velocity decreases by more fifty percent after 60 ms of hole-by-hole blasting. So blasting vibration can be precisely controlled by using non-electric detonators under high safety standard.
- mechanics of explosion,
- vibration reduction,
- hole-by-hole cut,
- tunnel excavation,
- precisely-controlled,
- vibration superposition,
- blasting

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References(15)

References

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