This chapter presents a micromechanical investigation into the effects of initial anisotropy, drainage conditions, and the consolidation state on the mechanical behavior and strain localization of dense sands. Discrete element simulations with non-spherical clumps were conducted to simulate drained and undrained biaxial tests of anisotropically deposited sands subjected to both isotropic and K0 consolidation. In drained tests, the stress–strain relationship involves initial hardening followed by strain softening, and the peak shear stress decreases as the bedding plane angle increases. K0 consolidation has a slight influence on the peak friction angle and does not affect the friction angle at zero dilatancy. In undrained tests, softening behavior is observed at low bedding angles, whereas a strengthening response emerges at higher bedding angles. As the bedding angle increases, the peak friction angle first decreases but then increases. The relative displacement and rotation angle of the clumps, along with the void ratio distribution within the sample, indicate the formation of shear bands, which cause inhomogeneous deformation fields. Excessive dilation develops inside the shear band, potentially leading to recontraction under drained conditions or a renewed increase in pore water pressure under undrained conditions. The formation of shear bands reduces the peak shear strength, with greater strength loss observed in samples with low bedding angles than in those with high bedding angles. The particle rotation modes and force chain networks evolve with shear band formation; as the major axis of clumped particles changes from vertical to parallel to the loading direction, the dominant particle contacts within the shear band transition from multipoint to single-point modes. The shear band width and inclination angle were quantified, and their variations with bedding angle were analyzed.