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Volume 37 Issue 6
Dec 2023
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Chinese Journal of High Pressure Physics  > 2023  >  37(6): 065301.
CHEN Xiaolin, ZHANG Zhiyu, WANG Kai, MENG Jiale, PENG Lei, WU Xiao. Optimization and Experimental Study of Pre-Splitting Blasting Parameters in a Certain Open-Pit Mine[J]. Chinese Journal of High Pressure Physics, 2023, 37(6): 065301. doi: 10.11858/gywlxb.20230692
Citation: CHEN Xiaolin, ZHANG Zhiyu, WANG Kai, MENG Jiale, PENG Lei, WU Xiao. Optimization and Experimental Study of Pre-Splitting Blasting Parameters in a Certain Open-Pit Mine[J]. Chinese Journal of High Pressure Physics, 2023, 37(6): 065301. doi: 10.11858/gywlxb.20230692
shu

Optimization and Experimental Study of Pre-Splitting Blasting Parameters in a Certain Open-Pit Mine

doi: 10.11858/gywlxb.20230692
  • 1.

    Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

  • 2.

    Faculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

  • 3.

    Zhejiang Tunnel Engineering Group Co., Ltd., Hangzhou 310000, Zhejiang, China

  • Received Date: 11 Jul 2023
  • Rev Recd Date: 21 Aug 2023
    • Available Online: 07 Dec 2023
  • Issue Publish Date: 15 Dec 2023
    Abstract
  • In order to obtain the optimal combination of pre-splitting blasting parameters to ensure the safety and stability of open-pit mine slope, the law of crack propagation under rock double-hole blasting was discussed by numerical simulation combined with similar model experiment, and the field pre-splitting blasting experiment was carried out. The results show that the cracks are first generated by the blasthole wall and the original rock near the blasthole is more damaged. As the decoupling coefficient increases from 1.33 to 3.00, the impact pressure on the hole wall decreases significantly, and the radius of the crushing zone decreases gradually. The range analysis method was used to study the influence of different factors on the experiment index, and the optimal combination of experiment factors was determined according to the evaluation index. The results of the model experiment indicate that the pre-splitting effect of the model specimen is the best under the combined conditions of the hole spacing-to-aperture ratio of 9, the decoupling coefficient of 3.00, the initiation delay time of 12 ms, and the maximum charge weight per delayed interval of 5.4 g (three holes and one shot). According to the results of numerical simulation and similar model experiment, combined with theoretical calculation, the pre-splitting blasting parameters with hole spacing of 0.8 m (the spacing-to-aperture ratio of about 9), decoupling coefficient of 3.00, delay time of 12 ms and maximum charge weight per delayed interval of 11.25 kg (three holes and one shot) were selected for field experiment, and good pre-splitting effect was achieved. The research results can provide reference for the design of pre-splitting blasting parameters in open-pit mines, and it is of great significance to realize accurate control blasting and ensure the safety and stability of open-pit mine slopes.

     

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