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Studies on directional breaking controlled theory of slotted cartridge blasting for rock

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Abstract

This paper adopts the red sandstone as blasting medium, studies the mechanism of rock breaking caused by slotted cartridge blasting, analyzes the crack distribution characteristics, sets up “rock-explosion crack” of three-dimensional reconstruction model, and accurately describes the explosion crack location and the shape of space distribution. The results show that there are only two cracks generated along the slotted direction of slotted cartridge blasting, and the crack position was symmetrical. Combining the calculation method of three-dimensional fracture fractal dimension with CT scanning, we quantitatively describe the evolution process of explosion fractures. The damage degree of rock after blasting with slotted cartridge was 56.5% lower than that of common charge. From the CT scan results and the numerical analysis, it can be concluded that slotted pipe causes plastic deformation, making the slotted pipe fit with blast-hole wall, and stress concentration occurs at the slotted pipe incision. The stress concentration intensity is greater than that in other areas, leading to the crack formation. Slotted cartridge initial crack formation location is at the joint of “slotted pipe incision and blast-hole wall.” It shows that the slotted cartridge can reduce the degree of damage caused by explosive, effectively protecting the damage caused by explosion to shaft wall.

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Acknowledgements

The authors would like to thank the anonymous reviewers for their valuable and constructive comments.

Funding

This research is supported by the Project Funded by China Postdoctoral Science Foundation (No.2020TQ0032), the Key Projects of National Natural Science Foundation of China (NO.51934001), the Fundamental Research Funds for the Central Universities (FRF-TP-20-037A1), and the Interdisciplinary Research Project for Young Teachers of USTB (Fundamental Research Funds for the Central Universities) (FRF-IDRY-20-019).

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Authors and Affiliations

  1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jinjing Zuo, Renshu Yang, Gong Min & Yang Yang

  2. State Key Laboratory for Geomechanics and Deep Underground Engineering (Beijing), Beijing, 100083, China

    Renshu Yang

  3. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Xinmin Ma

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  1. Jinjing Zuo
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  2. Renshu Yang
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  3. Gong Min
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  4. Yang Yang
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  5. Xinmin Ma
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Correspondence to Jinjing Zuo.

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The authors declare that they have no competing interests.

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Responsible Editor: Zeynal Abiddin Erguler

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Zuo, J., Yang, R., Min, G. et al. Studies on directional breaking controlled theory of slotted cartridge blasting for rock. Arab J Geosci 14, 1928 (2021). https://doi.org/10.1007/s12517-021-08334-2

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  • DOI: https://doi.org/10.1007/s12517-021-08334-2

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