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Numerical study on the effect of grain size on rock dynamic tensile properties using PFC-GBM

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Abstract

To understand the effect of grain size on the rock dynamic mechanical behaviors, dynamic semi-circular bending (SCB) experiments were carried out by means of a grain-based model based on particle flow code (PFC-GBM) with a split Hopkinson pressure bar (SHPB) system. Simulation results suggest that: (1) When the particle size is less than 0.75 mm, the strain rate presents a double-hump shape waveform; (2) the reflection coefficient rises linearly with increasing grain-to-particle size ratio, while the transmission coefficient remains constant; and (3) increasing grain-to-particle size ratio promotes the migration of particles in grains, resulting in the decrease in crack number and dynamic tensile strength. The results show the feasibility of PFC-GBM in studying the dynamics of crystalline rock, which can provide a reference for dynamic response analysis on the microscopic scale.

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The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The work presented in this paper was financially supported by the National Key R&D Program of China (2018YFC1508501), the National Natural Science Foundation of China (Grants No. 52209130), the National Natural Science Foundation of China (Grants Nos. 41831278 and 51679071).

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Authors and Affiliations

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

    Li Wangyang, Shi Chong & Zhang Cong

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

    Li Wangyang, Shi Chong & Zhang Cong

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  1. Li Wangyang
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  2. Shi Chong
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Correspondence to Zhang Cong.

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Wangyang, L., Chong, S. & Cong, Z. Numerical study on the effect of grain size on rock dynamic tensile properties using PFC-GBM. Comp. Part. Mech. 11, 481–489 (2024). https://doi.org/10.1007/s40571-023-00634-6

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  • DOI: https://doi.org/10.1007/s40571-023-00634-6

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