Granular piles, commonly referred to as stone columns, are vertical inclusions in soft soils. Granular piles may be either ordinary or encased with geosynthetic materials depending on the strength of the surrounding soil. Recent studies have made using granular piles both ordinary and encased in poor soils more feasible. The influence of column length on the performance of soils reinforced with granular piles is still not well defined, even though this improvement approach is widely established in the literature. This study has attempted to evaluate the influence of granular pile length on load-carrying capacity and stress concentration ratio for various possible reinforcement arrangements. Also, the radial bulging behaviour of both ordinary (OGP) and encased granular piles (EGP) has been addressed. An axisymmetric model was developed in PLAXIS 2D software and discretization was done using the 15-noded triangular element. All the soil materials used in the study were idealized using an isotropic linearly elastic perfectly plastic constitutive model with a Mohr–Coulomb failure criterion. Results suggested that there exists an optimum granular pile length, lengthening beyond which does not result in any considerable improvement. The optimum granular pile length was around 1.33, 1.67, 1.67, and 2 for OGP, EGP, Basal, and EGP + Basal reinforcement respectively. Also, significant improvement was observed in the stress concentration ratio through the utilization of various reinforcement arrangements. Furthermore, radial bulging was significantly reduced by encasing the granular pile with geogrid of varying stiffness.