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Article Dans Une Revue Physical Review E Année : 2023

Grain size distribution does not affect the residual shear strength of granular materials: An experimental proof

Résumé

Granular materials are used in several fields and in a wide variety of processes. An important feature of these materials is the diversity of grain sizes, commonly referred to as polydispersity. When granular materials are sheared, they exhibit a predominant small elastic range. Then, the material yields, with or without a peak shear strength depending on the initial density. Finally, the material reaches a stationary state, in which it deforms at a constant shear stress, which can be linked to the residual friction angle φ r. However, the role of polydispersity on the shear strength of granular materials is still a matter of debate. In particular, a series of investigations have proved, using numerical simulations, that φ r is independent of polydispersity. This counterintuitive observation remains elusive to experimentalists, and especially for some technical communities that use φ r as a design parameter (e.g., the soil mechanics community). In this Letter, we studied experimentally the effects of polydispersity on φ r. In order to do so, we built samples of ceramic beads and then sheared these samples in a triaxial apparatus. We varied polydispersity, building monodisperse, bidisperse, and polydisperse granular samples; this allowed us to study the effects of grain size, size span, and grain size distribution on φ r. We find that φ r is indeed independent of polydispersity, confirming the previous findings achieved through numerical simulations. Our work fairly closes the gap of knowledge between experiments and simulations.
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hal-04097310 , version 1 (15-05-2023)

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Oscar Polanía, Miguel Cabrera, Mathieu Renouf, Emilien Azéma, Nicolas Estrada. Grain size distribution does not affect the residual shear strength of granular materials: An experimental proof. Physical Review E , 2023, 107 (5), pp.L052901. ⟨10.1103/PhysRevE.107.L052901⟩. ⟨hal-04097310⟩
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