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Gold Science and Technology ›› 2021, Vol. 29 ›› Issue (3): 401-410.doi: 10.11872/j.issn.1005-2518.2021.03.174

• Mining Technology and Mine Management • Previous Articles    

Experimental Study on Precise Delay Hole-by-Hole Blasting Vibration Reduction of Underground Blasting

Xianglong LI1,2(),Qihu ZHANG1(),Jianguo WANG1,Deyuan YANG3,Bin LI4,Xingbiao ZHU4   

  1. 1.Faculty of Land Resources Engineer，Kunming University of Science and Technology，Kunming 650093，Yunnan，China
    2.Key Laboratory of Development and Utilization of Zhongde Blue Mine and Special Underground Mine，Kunming 650093，Yunnan，China
    3.Dahongshan Iron Mine，Kunming Iron & Steel Group Co. ，Ltd. ，Xinping 653100，Yunnan，China
    4.Yongshan Jinsha Mine Co. ，Ltd. ，Yongshan 657305，Yunnan，China
  • Received:2020-09-27 Revised:2021-02-09 Online:2021-06-30 Published:2021-07-14
  • Contact: Qihu ZHANG E-mail:lxl00014002@163.com;zhang18487084511@163.com

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Abstract:

The interference vibration reduction technology based on precise delay hole by hole initiation is not only an effective means to reduce blasting vibration，but also can improve the effect of rock fragmentation and realize the active control of blasting vibration effect and harm.The key of this technology is to calculate the accurate and reasonable delay time under the conditions of reasonable hole layout parameters，single hole charge and charge structure conditions.However，due to the low time delay accuracy and instability of the conventional ordinary nonel detonator，the effect of controlling the millisecond delay interval to reduce the blasting vibration is not good.Engineering blasting operations are mostly carried out in complex environments and have strict requirements on blasting vibration.Combining previous research results，an accurate and reasonable delay time for underground shallow hole blasting was given.At the same time，combined with the field test research，the application of accurate delay time in reducing blasting vibration was explored.In view of the fact that the digital electronic detonator initiation network can realize the precise control of the delay time of precise delay hole by hole initiation，the delay time can be set flexibly and the performance is stable，using high-precision and high-strength digital electronic detonator，the field test of precise delay hole by hole initiation was designed and carried out.And the vibration waveform velocity of vibration time history signal was analyzed by using MA-TLAB 18.0. In the field test，vector synthesis of the waveform can be obtained，and the peak velocity of the vibration waveform under the delay time between holes of 25 ms is reduced by 27%，8%，29%，52% compared with the peak velocity of 15，20，30，35 ms successively.The peak value of the vibration waveform velocity under the delay time between rows of 75 ms is reduced by 28%，26% and 23% compared with the delay of 25 ms，125 ms and 200 ms between rows of single row blastholes.The test results show that the reasonable delay time between holes and rows can effectively reduce the blasting vibration intensity.

Key words: precision delay, hole-by-hole initiation, peak vibration velocity, vibration intensity, waveform fusion, interference vibration reduction, field test

CLC Number: 

  • TD235

Fig.1

Schematic diagram of detonation network for the first test"

Fig.2

Blasting vibration waveform of the first test"

Fig.3

Synthesis diagram of blasting vibration vector of the first test"

Fig.4

Schematic diagram of detonation network for the second test"

Fig.5

Blasting vibration waveform of the second test"

Fig.6

Synthesis diagram of blasting vibration vector of the second test"

Fig.7

Schematic diagram of detonation network for the third test"

Fig.8

Blasting vibration waveform of the third test"

Fig.9

Synthesis diagram of blasting vibration vector of the third test"

Fig.10

Effect diagram of blasting"

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