Abstract
Drained triaxial simulations were carried out for three-dimensional (3D) assembly of ellipsoid particles using the discrete element method (DEM). It was found that the overall drained behaviour is dependent on both density state i.e. void ratio (e) and stress state i.e. confining stress (p′) as observed in many laboratory triaxial tests. The characteristic (Ch) state, where the behaviour (volumetric strain, εv) changes from contractive to dilative, was also observed for dilatant specimen. All these simulations reached critical state (CS) at the end of their simulation. The CS data points formed a unique CS line (CSL) in e-log(p′) and q-p′ space regardless of the initial states. The CSL facilitated further analysis in term of the state parameter (ψ), which is the difference in e and e at CS for the same p′. It was found that Ch states form a unique relationship with the ψ. This enabled to adopting a state dependent flow rule to capture dilatancy behaviour. This allowed adopting a SANISAND model to predict drained behaviour. Despite some limitations, the model was able to predict overall trends of shearing response. This study enhances the understanding of fundamental basis of the relationship between ψ and mechanical parameters of a cohesionless soil.
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Nguyen, H.B.K., Rahman, M. (2019). Drained Response of Granular Material. In: Hemeda, S., Bouassida, M. (eds) Contemporary Issues in Soil Mechanics. GeoMEast 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-01941-9_15
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