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On the mechanics of meso-scale structures in two-dimensional granular materials
Macroscopic behaviours of granular materials derive from the fabric distribution and evolution. Two kinds of fabric in the meso-scale can be distinguished: column-like clusters, called force-chains, which carry a majority of the external loading; and the loop-like clusters, called meso-loops, cells enclosed inside by contact branches. Some significant features in the meso-scale and how they influence the macroscopic behaviour of granular materials are investigated under the drained biaxial loading path. Results show that: (1) the macroscopic mechanical performance of the granular material can be associated to the evolution of the proportions of (meso-loops with 3 sides) and (meso-loops of number of side no less than 6); (2) there exists a single mesoscopic topology as the signature of the critical state of granular materials; (3) the force-chains adjacent area is the main source and contributor of the global dilatancy of the granular material. Moreover, the instability of the idealised hexagonal loop, as the representation of , is analysed. It is shown that under a loading path with a constant confinement, it is possible to proceed an elastic buckling, if there is a sufficient high confining stress or a sufficient low (the initial opening angle of the hexagon, initially controlling the elongation of it along the axial direction). and the stiffness ratio (the tangential stiffness over the normal stiffness) are found to be greatly influential to the instability of the hexagon, through influencing the Mohr–Coulomb line of the hexagon.
On the mechanics of meso-scale structures in two-dimensional granular materials
Macroscopic behaviours of granular materials derive from the fabric distribution and evolution. Two kinds of fabric in the meso-scale can be distinguished: column-like clusters, called force-chains, which carry a majority of the external loading; and the loop-like clusters, called meso-loops, cells enclosed inside by contact branches. Some significant features in the meso-scale and how they influence the macroscopic behaviour of granular materials are investigated under the drained biaxial loading path. Results show that: (1) the macroscopic mechanical performance of the granular material can be associated to the evolution of the proportions of (meso-loops with 3 sides) and (meso-loops of number of side no less than 6); (2) there exists a single mesoscopic topology as the signature of the critical state of granular materials; (3) the force-chains adjacent area is the main source and contributor of the global dilatancy of the granular material. Moreover, the instability of the idealised hexagonal loop, as the representation of , is analysed. It is shown that under a loading path with a constant confinement, it is possible to proceed an elastic buckling, if there is a sufficient high confining stress or a sufficient low (the initial opening angle of the hexagon, initially controlling the elongation of it along the axial direction). and the stiffness ratio (the tangential stiffness over the normal stiffness) are found to be greatly influential to the instability of the hexagon, through influencing the Mohr–Coulomb line of the hexagon.
On the mechanics of meso-scale structures in two-dimensional granular materials
Zhu, Huaxiang (author) / Veylon, Guillaume (author) / Nicot, François (author) / Darve, Félix (author)
European Journal of Environmental and Civil Engineering ; 21 ; 912-935
2017-08-03
24 pages
Article (Journal)
Electronic Resource
English
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