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Numerical analysis of deep hole multi-stage cut blasting of vertical shaft using a continuum-based discrete element method

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Abstract

Due to the high in situ stress of the deep rock mass and the restraining effect of the surrounding rock, the deep hole blasting of vertical shaft faces the problems of low borehole utilization rate and poor blasting effect. In this regard, this paper proposes a deep hole multi-stage cut blasting technology of vertical shaft. Preliminary engineering practice shows that such cut blasting technology can make better use of explosive energy, reduce the restraining effect of surrounding rock, and increase the borehole utilization rate. Furthermore, based on the continuum-based discrete element method (CDEM), the fractal damage, fragmentation, and blasting cavity characteristics of deep hole multi-stage cut blasting of vertical shaft are studied and analyzed. The results show that in the multi-stage cut blasting of vertical shaft, if the length proportion of the first stage is too small or too large, it will lead to poor cavity formation along the cut direction. Characteristic parameters such as fractal damage of blasting cavity, fracture degree of element, and fracture degree of interface show a trend of first increasing and then decreasing as the length proportion of the first stage increases, and the length proportion of the first stage has an optimal value. Under the conditions of rock parameters, explosive performance and linear charge density set by the numerical simulation in this paper, when the length proportion of the first stage accounts for 0.42, the multi-stage cut blasting of vertical shaft can make better use of explosive energy and achieve the best blasting effect.

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Funding

This research was supported by (1) Fundamental Research Funds for the Central Universities (FRF-TP-20-044A1), (2) China Postdoctoral Science Foundation (2020 M680354), (3) National Natural Science Foundation of China (51934001, 51974316).

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Authors and Affiliations

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

    Chenxi Ding, Renshu Yang & Songlin He

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

    Renshu Yang, Changda Zheng & Liyun Yang

  3. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Science, Beijing, 100190, China

    Chun Feng

Authors
  1. Chenxi Ding
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  2. Renshu Yang
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  3. Changda Zheng
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  4. Liyun Yang
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  5. Songlin He
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  6. Chun Feng
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Correspondence to Chun Feng.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Responsible Editor: Murat Karakus

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Ding, C., Yang, R., Zheng, C. et al. Numerical analysis of deep hole multi-stage cut blasting of vertical shaft using a continuum-based discrete element method. Arab J Geosci 14, 1086 (2021). https://doi.org/10.1007/s12517-021-07425-4

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  • DOI: https://doi.org/10.1007/s12517-021-07425-4

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