Three dimensional discrete element modelling of the conventional compression behavior of gas hydrate bearing coal
Xia Gao1
Nannan Wang2
Baoyong Zhang3
Qiqi Lin4
Qiang Wu3
Wei Meng4
Xia Liu5
1.Department of Architecture and Civil Engineering,Heilongjiang University of Science and Technology,Harbin 150022,China2.Department of Architecture and Civil Engineering,Heilongjiang University of Science and Technology,Harbin 150022,China;School of Qilu Transportation,Shandong University,Jinan 250061,China3.Department of Safety Engineering,Heilongjiang University of Science and Technology,Harbin 150022,China4.School of Qilu Transportation,Shandong University,Jinan 250061,China5.Jining Hongxiang Highway Survey Design and Research Institute Co.Ltd,Jining 272000,China
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.Fur-thermore,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.
机标关键词：elementbehaviorbearingcoalcompressionconventionaldimensionaldiscrete
论文发表日期：2024-02-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：17( 61-77 )
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