A sphere packing model for shear bands in dense soils

Research output: Contribution to conferencePaperpeer-review

Abstract

The rhombic sphere packing can be used to model the biaxial test on granular soils in a very simple way. According to the angle of assemblage, the packing is dilatant or contractive. Correspondingly, overall stresses are transmitted as chains of forces or oblique forces of contact. The connection of the soil stress-strain behaviour and the packing void ratio is achieved by mapping both of the plots. The mapping shows that dense soils are dilatant and loose soils are contractive, separated by the critical state. It also shows that the bifurcation point and the peak strength are features only of dense soils. The band of strain localization is analysed in the elastic regime, and its inclination is found maximizing the intensity of the mobilized stress ratio. The stresses within the shear band are obtained by assuming a partially coaxial packing rotated to reach the full plastic state. The equilibrium of the overall stress at the line of discontinuity reveals a relationship between the peak friction angle and the coefficient of lateral pressure at rest. As long as these parameters are obtained independently of each other, they allow the validation of the theory.

Original languageEnglish
DOIs
StatePublished - 7 Jun 2021
Event9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021 - Virtual, Online, Argentina
Duration: 5 Jul 20216 Aug 2021

Conference

Conference9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021
Country/TerritoryArgentina
CityVirtual, Online
Period5/07/216/08/21

Bibliographical note

Publisher Copyright:
© The Authors, published by EDP Sciences.

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