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Volume 57 Issue 5
Oct.  2022
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Journal of Southwest Jiaotong University  > 2022  >  57(5): 1086-1095.
CHEN Long, WU Shunchuan, JIN Aibing. Particle Discrete Element Layered Modeling Method and Particle Size Effect[J]. Journal of Southwest Jiaotong University, 2022, 57(5): 1086-1095. doi: 10.3969/j.issn.0258-2724.20210023
Citation: CHEN Long, WU Shunchuan, JIN Aibing. Particle Discrete Element Layered Modeling Method and Particle Size Effect[J]. Journal of Southwest Jiaotong University, 2022, 57(5): 1086-1095. doi: 10.3969/j.issn.0258-2724.20210023
shu

Particle Discrete Element Layered Modeling Method and Particle Size Effect

doi: 10.3969/j.issn.0258-2724.20210023
  • 1.

    Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing 100083, China

  • 2.

    Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China

  • Received Date: 11 Jan 2021
  • Rev Recd Date: 16 May 2021
    • Available Online: 11 Jul 2022
  • Publish Date: 07 Sep 2021
    Abstract

  • Discrete element analysis method is one of the important tools for studying rock mechanics behavior and refining the basic theory of rock mechanics. In order to improve the accuracy of the particle discrete element method to simulate indoor rock mechanics and large-scale engineering scale tests, a layered modeling method is proposed. This method adopts small-size particles for fine simulation of the rock or key rock mass area, and large-size particles for the outside area to expand the calculation area. The layered modeling method is used to carry out uniaxial compression and Brazilian splitting tests, and compared with the conventional modeling calculation results, which preliminarily verifies its feasibility to simulate indoor mechanical tests. The results show that the layered modeling method is affected by the particle size like conventional modeling, but it can reduce the number of particles in the particle flow code model and increase the calculation efficiency by more than 50%. The uniaxial compressive strength and crack initiation stress of the layered model are reduced by only 2.7% and 1.9% at most, compared with those of the conventional model with the corresponding outer layer. The coefficient of variation (COV) of uniaxial compressive strength and crack initiation stress is generally larger than that of the conventional model, but it is still within the acceptable range of 2%. The inhomogeneity of particle size distribution in the layered model has minor effect on the deformation properties of the model at the elastic stage, and the elastic modulus of the layered model is reduced by 1.3%−2.3% compared with the conventional model with the corresponding outer layer. The overall Brazilian splitting tensile strength of the layered model is increased by 1.32%−2.35% compared to that of the conventional model with the corresponding outer layer, and the macroscopic fracture characteristics are similar to those of the conventional small-particle model, but there are more cracks near the loading plate.

     

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