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Study on the Guiding Mechanism of Multiple and Empty Holes Under Explosion Load

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Abstract

In the past, the selection of the number of empty holes between blast holes heavily relied on the subjective experience of practitioners, leading to unsatisfactory blasting results. The number of empty holes between blast holes is particularly important for the perforation of explosive cracks. In order to determine the optimum number of empty holes for inducing the propagation of explosive cracks, a two-dimensional numerical model of two-hole blasting was established based on the continuous-discontinuous element method (CDEM) using polymethyl methacrylate (PMMA) as the medium, and numerical simulation of various working conditions was conducted; the simulation results are basically consistent with the PMMA model test. Through the analysis of blasting parameters, the optimal number of empty holes with a certain hole spacing is fitted. The following conclusions are drawn: (1) There is a threshold for variable x. When x exceeds 50, the presence of empty holes cannot lead to the perforation of explosive cracks between the blast holes. (2) When x is below 50, the optimal number of empty holes inducing the propagation of explosive cracks can be determined through fitting an empirical formula. By adjusting the number of empty holes between blast holes, a significant spacing between adjacent blast holes was achieved, allowing for effective penetration, so as to effectively “induce” the direction of the fracture zone and make full use of the energy of explosives. The research results of this paper are conducive to the research of directional blasting technology and provide certain references for the optimization of precision blasting parameters.

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Funding

The authors received financial support from the National Natural Science Foundation of China (NSFC) (52178324).

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Authors and Affiliations

  1. School of Civil and Transportation Engineering, Hebei University of Technology, Xiping Road 5340, Tianjin, 300401, China

    Ruyang Cao, Yunpeng Li & Yiming Zhang

  2. Institute of Mechanics, Chinese Academy of Sciences, North 4th Ring West Road 15, Beijing, 100190, China

    Chun Feng

  3. School of Engineering Sciences, University of Chinese Academy of Sciences, Yuquan Road 19, Beijing, 100049, China

    Chun Feng

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  1. Ruyang Cao
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Correspondence to Yunpeng Li.

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Cao, R., Li, Y., Feng, C. et al. Study on the Guiding Mechanism of Multiple and Empty Holes Under Explosion Load. Mining, Metallurgy & Exploration 41, 277–286 (2024). https://doi.org/10.1007/s42461-023-00902-2

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  • DOI: https://doi.org/10.1007/s42461-023-00902-2

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