Fabric Study of Granular Materials after Compaction

Quantifying the evolution of soil fabric during shearing using directional parameters

“…No significant variation can be seen for samples at different load stages, which is in agreement with the observation made by Ng (1999), although Ng did report a significantly narrower range of AE values. For the current study AE tended to decrease with increasing contact size.…”

Macro- and micro-behaviors of granular materials under different sample preparation methods and stress paths

“…The discrete element method (DEM), a numerical method, has demonstrated the ability to study granular materials. DEM has been used to examine the fabric of granular samples generated with identical preparation process (Rothenburg and Bathurst, 1992;Ng, 1999Ng, , 2001. In this paper, we will use the DEM and the newly developed hydrostatic boundary to perform drained tests on samples of ellipsoids of two sizes that were prepared differently.…”

Statistical homogenization for assemblies of elliptical grains: effect of the aspect ratio and particle orientation

“…They can be explained to a certain extent by the grain size distribution considered in DEM simulations and that the theoretical approach does not account for. As mentioned by Ng (1999), the branch vector length distribution is constant with the shape factor a 2 provided that this distribution is normalized between the minimum and maximum possible values for l c .…”

“…Numerical simulations using the discrete element method with elliptical 2D particles or ellipsoids (3D) can be used to determine the evolution of both the distributions of the contact orientation, branch vector length and other interparticle contact features and the global characteristics such as elastic moduli and friction angles (Ng, 1994(Ng, , 1999(Ng, , 2001Bathurst, 1991, 1992;Ting et al, 1993Ting et al, , 1995Claquin, 2003;Emeriault and Claquin, 2003).…”