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Numerical simulation of column charge explosive in rock masses with particle flow code

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Abstract

The detonation of a column charge and the damage process in a rock mass are simulated in this study by the particle flow code method. The expansion loading method and the dynamic boundary treatment method are established according to the discrete element mechanism. Mechanical parameters are calibrated on the basis of the Starfield superposition principle and the dynamic compensation method. Dynamic stiffness and microscopic parameters are used for numerical simulations. Numerical test results are consistent with lab experimental test results. The velocity attenuation law is compared with that of theoretical results, and the blasting crater action index is compared with that of field test results, to verify the rationality of the numerical explosion model of the column charge. The mechanism of the rock breaking process under column charge explosion is analyzed. Stress wave propagation, detonation wave propagation, and crack extension are investigated. The stress wave gradient law is obtained, and the effects of blasting rock breaking, crack extension, and explosion effect outside the blasting crater area are determined with different initiation modes. The research method can explain the blasting stress wave propagation law and describe the dynamical failure process in rock masses. This study can provide a reliable numerical analysis method for follow-up blasting research and offer practical guidance on engineering blasting.

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Acknowledgements

The work presented in this paper was financially supported by the National Natural Science Foundation of China (Grant No. 51679071), the National Basic Research Program of China (973 Program) (Grant No. 2015CB057903) and the Natural Science Foundation of Jiangsu Province (Grant No. BK20171434).

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, 210098, China

    Junxiong Yang, Chong Shi, Wenkun Yang, Xiao Chen & Yiping Zhang

  2. Research Institute of Geotechnical Engineering, Hohai University, Nanjing, 210098, China

    Junxiong Yang, Chong Shi, Wenkun Yang, Xiao Chen & Yiping Zhang

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  1. Junxiong Yang
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Correspondence to Chong Shi.

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Yang, J., Shi, C., Yang, W. et al. Numerical simulation of column charge explosive in rock masses with particle flow code. Granular Matter 21, 96 (2019). https://doi.org/10.1007/s10035-019-0950-2

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