Deformation and Force Chain of Two-Dimensional Granular Systems under Continuous Loading

Chen, Fanxiu; Liu, Yuxin; Wang, Yuan; Gu, Ye; Yu, Yongfu; Sun, Jie

doi:10.3390/ma16155441

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…The deformations generated by the Terzaghi principle in a porous medium, in the context of tunnel works in soft rock and granular terrain, have been resolved with the use of FEM [11]. Chen et al [12] carried out a continuous loading experiment with a two-dimensional granular system and obtained the experimental data through digital image correlation (DIC). The experimental results indicated that the evolution of force chains was directly related to the number, geometric properties and permutation distribution of granules in direct contact with the external load.…”

Section: Introductionmentioning

confidence: 99%

Mechanics and Stability of Force Chain Arch in Excavated Granular Material

Wang,

Zheng,

Xue

2024

Applied Sciences

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Rock and soil masses in geotechnical engineering projects, such as tunnels, mines and slopes, undergo relative motion, exhibiting mechanical characteristics of solid–fluid transition under critical conditions. This work analyzes the characteristics of the solid–fluid transition interface and the mode of load transfer through biaxial compression particle flow photoelastic experiments on granular materials. The study documents that this interface forms an arch shape, marked by a force chain arch. The granular material exhibits two distinct states depending on its position: below the arch, the granular material is in a solid–fluid transitional state, with bearing capacity reduced, while above the arch, it is in a stable solid state, capable of bearing the overlying rock layer’s load. The presence of the force chain arch alters the direction of the originally downward-transferring load, redirecting it along the trajectory of the arch. Analysis of the force and stability of the force chain arch revealed that the arch shape parameters and boundary loads control the instability of the arch. Changes in the overlying and lateral loads lead to different types of instability of the force chain arch. The findings of the study are crucial for underground engineering construction and for the prevention of geological disasters related to granular material.

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Section: Introductionmentioning

confidence: 99%

Mechanics and Stability of Force Chain Arch in Excavated Granular Material

Wang,

Zheng,

Xue

2024

Applied Sciences

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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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Deformation and Force Chain of Two-Dimensional Granular Systems under Continuous Loading

Cited by 2 publications

References 27 publications

Mechanics and Stability of Force Chain Arch in Excavated Granular Material

Mechanics and Stability of Force Chain Arch in Excavated Granular Material

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

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