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主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
Three dimensional discrete element modelling of the conventional compression behavior of gas hydrate
  • 作者

    Xia GaoNannan WangBaoyong ZhangQiqi LinQiang WuWei MengXia Liu

  • 单位

    Department of Architecture and Civil Engineering, Heilongjiang University of Science and TechnologySchool of Qilu Transportation, Shandong UniversityDepartment of Safety Engineering, Heilongjiang University of Science and TechnologyJining Hongxiang Highway Survey Design and Research Institute Co. Ltd

  • 摘要

    To analyze the relationship between macro and meso parameters of the gas hydrate bearing coal (GHBC) and to calibrate the meso-parameters, the numerical tests were conducted to simulate the laboratory triaxial compression tests by PFC3D, with the parallel bond model employed as the particle contact constitutive model. First, twenty simulation tests were conducted to quantify the relationship between the macro–meso parameters. Then, nine orthogonal simulation tests were performed using four meso-mechanical parameters in a three-level to evaluate the sensitivity of the meso-mechanical parameters. Furthermore, the calibration method of the meso-parameters were then proposed. Finally, the contact force chain, the contact force and the contact number were examined to investigate the saturation effect on the meso-mechanical behavior of GHBC. The results show that: (1) The elastic modulus linearly increases with the bonding stiffness ratio and the friction coefficient while exponentially increasing with the normal bonding strength and the bonding radius coefficient. The failure strength increases exponentially with the increase of the friction coefficient, the normal bonding strength and the bonding radius coefficient, and remains constant with the increase of bond stiffness ratio; (2) The friction coefficient and the bond radius coefficient are most sensitive to the elastic modulus and the failure strength; (3) The number of the force chains, the contact force, and the bond strength between particles will increase with the increase of the hydrate saturation, which leads to the larger failure strength.

  • 关键词

    Gas hydrate bearing coalDiscrete element methodTriaxial compression testMacro–meso mechanical propertiesSaturationLinear parallel bond model

  • DOI
  • 引用格式
    Gao, X., Wang, N., Zhang, B. et al. Three dimensional discrete element modelling of the conventional compression behavior of gas hydrate bearing coal.Int J Coal Sci Technol 11, 3 (2024).
  • 图表
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    • Mechanism of coal and gas outburst prevention based on hydrate method: a Coal sample; b Formed gas hydrate; c Hydrate distribution at the coal sample; d Stress–strain curves of coal before and after gas hydrate formation;

    图(15) / 表(7)

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主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会

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