Effect of Delay Time on Attenuation Law of Blasting Vibration in Hole−by−hole Presplitting

WANG Jianguo; TAO Jialong; SHI Fei; WAN Zaichun

doi:10.13779/j.cnki.issn1001-0076.2024.04.002

2024 Vol. 44, No. 4

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Article navigation > Conservation and Utilization of Mineral Resources > 2024 > 44(4): 9-17

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WANG Jianguo, TAO Jialong, SHI Fei, WAN Zaichun. Effect of Delay Time on Attenuation Law of Blasting Vibration in Hole−by−hole Presplitting[J]. Conservation and Utilization of Mineral Resources, 2024, 44(4): 9-17. doi: 10.13779/j.cnki.issn1001-0076.2024.04.002

Citation:

WANG Jianguo, TAO Jialong, SHI Fei, WAN Zaichun. Effect of Delay Time on Attenuation Law of Blasting Vibration in Hole−by−hole Presplitting[J]. Conservation and Utilization of Mineral Resources, 2024, 44(4): 9-17. doi: 10.13779/j.cnki.issn1001-0076.2024.04.002

Effect of Delay Time on Attenuation Law of Blasting Vibration in Hole−by−hole Presplitting

1.
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Yunnan Shangli Mining Co., Kunming 650299, Yunnan, China
3.
Mining Institute of Yunnan Copper Co., LTD, Kunming 650224, Yunnan, China
4.
Advanced Blasting Technology Engineering Research Center of Yunnan Provincial Department of Education, Kunming 650093, Yunnan, China

More Information

Corresponding author: WANG Jianguo, wangjg0831@163.com

Received Date: 09 April 2024

Publish Date: 15 August 2024

Abstract

Abstract

To obtain the optimal delay time of hole−by−hole pre−splitting blasting, based on Ansys / LS−Dyna finite element software, combined with field experiments, this paper studies the vibration attenuation law of hole−by−hole pre−splitting blasting under different delay time, which provides a theoretical basis for practical engineering application. The results showed that compared with the simultaneous initiation, the hole−by−hole initiation effectively reduced the peak particle vibration velocity (PPV), especially in the area near the pre−split trench. As the delay time increased, the K value of the Sadaovsk formula gradually decreased, while the α value did not change much. When the delay time was greater than 0.6T (T was the duration of single−hole blasting vibration), the values of K and α tended to be stable and close to single−hole blasting. The correction coefficient β was inversely proportional to the delay time, and the optimal delay time should be 0.6 T~1.0 T; the vibration reduction rate of the main blasting area after hole−by−hole pre−splitting was greater than that of the simultaneous pre−splitting blasting.
- pre−splitting blasting /
- hole−by−hole blasting /
- delay time /
- blasting vibration /
- numerical simulation

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References

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