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Volume 37 Issue 4
Sep 2023
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Chinese Journal of High Pressure Physics  > 2023  >  37(4): 044204.
CUI Niansheng, WEI Jianlin, YUAN Zengsen, XU Zhenyang, LIU Xin, WANG Xuesong. Simulation Analysis of Mesoscale Characteristics in the Dynamic Fracture Damage of Heterogeneous Rock[J]. Chinese Journal of High Pressure Physics, 2023, 37(4): 044204. doi: 10.11858/gywlxb.20230638
Citation: CUI Niansheng, WEI Jianlin, YUAN Zengsen, XU Zhenyang, LIU Xin, WANG Xuesong. Simulation Analysis of Mesoscale Characteristics in the Dynamic Fracture Damage of Heterogeneous Rock[J]. Chinese Journal of High Pressure Physics, 2023, 37(4): 044204. doi: 10.11858/gywlxb.20230638
shu

Simulation Analysis of Mesoscale Characteristics in the Dynamic Fracture Damage of Heterogeneous Rock

doi: 10.11858/gywlxb.20230638
  • 1.

    Fujian Xinhuadu Engineering Co. Ltd., Xiamen 361000, Fujian, China

  • 2.

    Minerals (Handan) Mine Engineering Co. Ltd., Handan 056000, Hebei, China

  • 3.

    College of Mining Engineering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China

  • 4.

    School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China

  • Received Date: 07 Apr 2023
  • Rev Recd Date: 29 Apr 2023
    • Available Online: 11 Jul 2023
  • Issue Publish Date: 01 Sep 2023
    Abstract
  • In order to investigate the mesoscale development in the dynamic fracture damage of heterogeneous rocks at the mineral crystal scale, a heterogeneous rock model that can reflect the microstructure characteristics was constructed based on the particle flow code-grain based model (PFC-GBM) method. By establishing the split Hopkinson pressure bar (SHPB) system using finite difference method FLAC2D and discrete element method PFC2D, the dynamic impact failure process of heterogeneous rock under different impact loading was simulated and studied. Through the self-compiled Fish language, the number of intragranular and intergranular microcracks in different minerals during the dynamic failure process was grouped and counted. The microscopic evolution process of dynamic fracture damage of heterogeneous rocks was deeply analyzed from a mesoscopic perspective. The research results show that intergranular failure is an important reason for the failure of the dominant heterogeneous rock under the static uniaxial compression condition. Under impact loading condition, the growth process of microcracks within and between crystals of each mineral had four stages: initiation, rapid growth, slow growth and stop growth. Similar to the growth pattern of the number of microcracks under static uniaxial compression condition, the number of intergranular cracks at the initial stage of dynamic failure was significantly higher than the number of intragranular cracks in each mineral. The rock mainly suffered intergranular damage. As the degree increases, the number of intragranular cracks in dynamic failure gradually exceeds the number of intergranular cracks. In addition, the peak strain rate and the corresponding maximum pressure as well as the dynamic peak strength and the corresponding maximum pressure under different impact loads in the simulation show good linear relationships, which provides a simple method to quickly determine the relevant dynamic mechanical parameters of the rock.

     

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