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Blasting vibration characteristics and PPV calculation formula considering cylindrical charge length

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Abstract

The surrounding rock is divided into elastic zone and plastic zone according to the motion and deformation characteristics of medium in rock blasting. Cylindrical charge blasting vibration is framed based on past research related to blasting elastic–plastic theory, and the influence of detonation velocity on cylindrical blasting vibration is considered, especially for long charge length. A superposition model is used to calculate the vibration characteristics of long cylindrical charge blasting while considering the influence of charge length. The analysis results show that when the charge length reaches a certain length, the peak particle velocity (PPV) no longer increases with an increase in charge length, which is not consistent with the traditional theory for PPV calculation. In current practice, the calculation method for spherical charge blasting is used to calculate PPV values for a cylindrical charge. This approach, however, is inaccurate. As such, a new modified PPV calculation formula that considers the characteristics of cylindrical blasting is proposed in this paper after comparing with the spherical blasting PPV calculation method, and the influencing factor of charge length is introduced. The new PPV calculation formula can better characterize cylindrical charge blasting vibration attenuation laws.

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Acknowledgements

This research was supported by the National Nature Science Foundation of China under Grant 11672112, the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20113718110002) and the Fund of the State key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact (PLA University and Technology) (No. DPMEIKF201307), Huaqiao University Research Foundation (13BS402).

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Authors and Affiliations

  1. College of Civil Engineering, Huaqiao University, Xiamen, 361000, China

    Shihai Chen, Jian Wu & Zihua Zhang

  2. Fujian Research Center for Tunneling and Urban Underground Space Engineering, Huaqiao University, Xiamen, 361000, China

    Shihai Chen

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  1. Shihai Chen
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  2. Jian Wu
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  3. Zihua Zhang
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Correspondence to Shihai Chen.

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Chen, S., Wu, J. & Zhang, Z. Blasting vibration characteristics and PPV calculation formula considering cylindrical charge length. Environ Earth Sci 76, 674 (2017). https://doi.org/10.1007/s12665-017-7027-5

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