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Destressing Mechanics Effect of Surrounding Rock Induced by Blasting Precondition at Deep Drift Development

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Abstract

Using a detailed modeling simulation technology, a mechanics simulation model was constructed, including multiple development rounds, stress relief holes with small diameters, and the areas formed by blasting precondition. The stress evolution trend of blasting precondition in drift development was analyzed, and the destressing mechanics effects of blasting precondition for the highly stressed development at depth were evaluated from the changes in rockburst stress hazard index before and after precondition, the change ratio of elastic strain energy, and the movement characteristics of surrounding rock around development space. The results show that the change in stress field is a dynamic evolution process along with stress relief holes, blasting precondition, and drift excavation which includes “Butterfly” low stress concentration, highly stressed concentration of “elliptical ring,” and approximately circular low stress area controlled by rock mass after blasting precondition. The blasting precondition schemes can push the higher stress hazard to the periphery of the blasting precondition area as a whole, and the pushing depth can be increased by 50%. The blasting precondition decreases the strain energy of the shallow surrounding rock and improves its energy storage characteristics. The rock mass around development space produces additional deformations towards the two directions of development space and precondition areas, and the range of additional deformations reaches 3 m away from the center line of the drift.

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Acknowledgements

This work was supported by the State Key Research Development Program of China under Grant No. 2016YFC0600709.

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Authors and Affiliations

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

    Shibo Yu & Xiaocong Yang

  2. BGRIMM Technology Group, Beijing, 102628, China

    Shibo Yu, Xiaocong Yang, Ye Yuan & Zhixiu Wang

  3. School of Earth Sciences and Engineering, Hohai University, Nanjing, 210098, China

    Chun Zhu

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  1. Shibo Yu
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  2. Xiaocong Yang
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  3. Chun Zhu
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  4. Ye Yuan
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  5. Zhixiu Wang
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Correspondence to Xiaocong Yang or Chun Zhu.

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Yu, S., Yang, X., Zhu, C. et al. Destressing Mechanics Effect of Surrounding Rock Induced by Blasting Precondition at Deep Drift Development. Geotech Geol Eng 39, 4113–4125 (2021). https://doi.org/10.1007/s10706-021-01687-1

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  • DOI: https://doi.org/10.1007/s10706-021-01687-1

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