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Dynamic Tensile Mechanical Properties of Outburst Coal Considering Bedding Effect and Evolution Characteristics of Strain Energy Density

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  • Shuang Gong

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
    Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources, Jiaozuo 454000, China
    Collaborative Innovation Center of Coal Work Safety, Jiaozuo 454000, China)

  • Chaofei Wang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Furui Xi

    (China Institute of Geo-Environment Monitoring, Beijing 100081, China
    Key Laboratory of Mine Ecological Effects and Systematic Restoration, Ministry of Nature Resource, Beijing 100081, China)

  • Yongqiang Jia

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Lei Zhou

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Hansong Zhang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Jingkuo Wang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Xingyang Ren

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Shuai Wang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Shibin Yao

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Juan Liu

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

Abstract

The evolution of strain energy density of outburst-prone coal is of great significance for analyzing the characteristics of energy accumulation and release in coal and rock masses. The dynamic mechanical properties of coal samples were tested by using the split Hopkinson pressure bar (SHPB) technique. Dynamic tensile mechanical properties, layered effect and density evolution characteristics of strain energy for coal were studied. The dynamic failure and crack propagation process of the specimen were recorded with a high-speed camera. In addition, a digital image correlation (DIC) method was used to analyze the evolution characteristics of the strain field during the deformation process of the specimen. The distribution characteristics of the particle fragments were statistically analyzed. The results show that the bedding orientation of the coal has a significant effect on its deformation and damage features. The presence of weak planes, microcracks and laminae causes its shear damage zone to behave more complex. If the crack plane coincides with the high shear stress plane, the developed shear cracks extend along the weak laminae and the shear damage zones in BD specimens are not symmetrically distributed. When the laminated surface of the coal sample is at a certain angle with the impact loading direction, the damage mode is coupled with tensile and shear damage. The percentage mass distribution of particles and fines increases with increasing bedding orientation. The effect of water on the dynamic damage of coal samples is significant. Based on the principle of pressure expansion of wing-shaped cracks, the formula for calculating the dynamic strength of water-saturated coal samples under dynamic loading was derived.

Suggested Citation

  • Shuang Gong & Chaofei Wang & Furui Xi & Yongqiang Jia & Lei Zhou & Hansong Zhang & Jingkuo Wang & Xingyang Ren & Shuai Wang & Shibin Yao & Juan Liu, 2022. "Dynamic Tensile Mechanical Properties of Outburst Coal Considering Bedding Effect and Evolution Characteristics of Strain Energy Density," Mathematics, MDPI, vol. 10(21), pages 1-33, November.
    • Handle: RePEc:gam:jmathe:v:10:y:2022:i:21:p:4120-:d:963673
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    References listed on IDEAS

    as
    1. Kunyun Tian & Erjian Wei & Conghu LIU, 2022. "Gas Seepage Model and Experiment Based on Bedding Effect of Fractured Coal Body," Mathematical Problems in Engineering, Hindawi, vol. 2022, pages 1-11, May.
    2. Kun Zhong & Wusheng Zhao & Changkun Qin & Weizhong Chen, 2021. "Experimental Study on the Mechanical Behavior and Failure Characteristics of Layered Coal at Medium Strain Rates," Energies, MDPI, vol. 14(20), pages 1-15, October.
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    Cited by:

    1. Shuang Gong & Shibin Yao & Furui Xi & Juan Liu & Xingyang Ren & Dengyun Niu & Jiaxing Ding & Hao Zhang & Jingkuo Wang & Shuai Wang, 2022. "A Comparison of Research Methods to Determine the Sustainability of Mineral Resources in Henan Province Based on Cloud Analysis," Sustainability, MDPI, vol. 14(23), pages 1-20, November.

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