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Volume 34 Issue 5
Sep 2020
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Chinese Journal of High Pressure Physics  > 2020  >  34(5): 054203.
WANG Yixian, LIANG Weimin. Fractal Study on Influence of Impact Load on Microscopic Pore of Anthracite[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 054203. doi: 10.11858/gywlxb.20200528
Citation: WANG Yixian, LIANG Weimin. Fractal Study on Influence of Impact Load on Microscopic Pore of Anthracite[J]. Chinese Journal of High Pressure Physics, 2020, 34(5): 054203. doi: 10.11858/gywlxb.20200528
shu

Fractal Study on Influence of Impact Load on Microscopic Pore of Anthracite

doi: 10.11858/gywlxb.20200528
  • 1.

    School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

  • 2.

    Henan Technical College of Construction, Zhengzhou 450064, Henan, China

  • Received Date: 12 Mar 2020
  • Rev Recd Date: 26 Mar 2020
    Abstract
  • In order to reveal the influence of impact loading on the microscopic pore structure of anthracite, the shock and stress waves of the impact stress in different attenuation processes were simulated by using the split Hopkinson pressure bar (SHPB) impact loading system, and the fractal characteristics of the pore structures of anthracite in different directions of Zhaogu No.2 Mine (vertical, parallel and 45° oblique to the bedding direction) were studied by using the fractal theory based on the test data of mercury intrusion and low-temperature liquid nitrogen before and after impacting. The results show that for the seepage hole, the impact loading increases the gas seepage and migration velocity. For the adsorption hole, the impact loading reduces the adsorption capacity of the adsorption hole, which promotes the desorption of gas. Fractal dimension has obvious impact directionality, and the fractal dimension of the adsorption hole is obviously smaller than that of the seepage hole; the optimal impact loadings of anthracite in different directions are different. The optimal loading in the vertical bedding direction and the oblique bedding direction is 51.80 MPa, and the optimal impact loading in the parallel bedding direction is 28.46 MPa. The research results can provide support for the discussion of the mechanism of impact loading to promote gas drainage.

     

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