In many countries around the world, including Romania, there are highly compressible soils that include a wide range of geological materials such as: saturated silts, unconsolidated deposits, soft clay soils, loose or medium-density sands, etc. Due to their very high compressibility, these types of soils have significant settlements under the loads transmitted by the foundations, settlements that are incompatible with the integrity and normal operation of the buildings. Crushed stone columns have been used to improve such foundation soils. In highly compressible soils this improvement technique may be limited by the absence of sufficient lateral confining pressure to limit the phenomenon of lateral swelling failure of the crushed stone column. For this reason, the crushed stone columns must be reinforced / confined to ensure the minimum necessary lateral pressure. To study the behavior of conventional crushed stone columns and those reinforced / confined with geogrids, 2D numerical analyses were performed in the plane stress state using the Mohr-Coulomb model and a FEM program.