Evolution law study of pore and fracture of coal gangue cemented filling body under axial compression using PFC2D

Huang, Dongmei; Wang, Xinzhao; Chang, Xikun; Qiao, Shuyu; Lu, Huanhuan; Pan, Xin

doi:10.1016/j.conbuildmat.2023.134340

Construction and Building Materials

2024

DOI: 10.1016/j.conbuildmat.2023.134340

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Evolution law study of pore and fracture of coal gangue cemented filling body under axial compression using PFC2D

Dongmei Huang,

Xinzhao Wang,

Xikun Chang

et al.

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Identification of force chains in wet coal dust layer and the effect of porosity on three-body contact stiffness

Yang,

Wu,

Bai

et al. 2024

Sci Rep

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Aiming at the three-body contact problem of mechanical rough surface containing wet coal dust interface, the three-body contact model of rough surface containing wet coal dust interface is constructed by comprehensively considering the contact deformation of rough surface and contact characteristics of wet coal dust, and based on the crushing theory. By analysing the contact force, load-bearing particle size and adjacent contact angle thresholds of the wet coal dust layer, the force chain identification criterion is formulated. Finally, quantitative calculations of the force chain characteristics are performed to reveal the effect of different initial porosities on the three-body contact stiffness, which is verified experimentally. The results of the study show that the average contact force of the wet coal dust layer can be used as the force chain contact force threshold, the average particle size can be used as the force chain particle size threshold, and the force chain angle threshold is determined by the particle coordination number. As the initial porosity decreases, the number, length and stiffness of force chains in the wet coal dust layer increase significantly, and the stiffness reaches a maximum value of 2.007 × 108 pa/m at the moment of downward pressure to stabilisation, while the trend of force chain bending varies in the opposite direction, and its minimum bending degree decreases to 20°. The maximum relative error between the simulation and experimental results of three-body contact stiffness is 9.64%, which proves the accuracy of the force chain identification criterion and the quantitative calculation of three-body contact stiffness by force chain.

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Identification of force chains in wet coal dust layer and the effect of porosity on three-body contact stiffness

Yang,

Wu,

Bai

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

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Evolution law study of pore and fracture of coal gangue cemented filling body under axial compression using PFC2D

Cited by 1 publication

References 28 publications

Identification of force chains in wet coal dust layer and the effect of porosity on three-body contact stiffness

Identification of force chains in wet coal dust layer and the effect of porosity on three-body contact stiffness

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