For low-rise buildings and structures such as liquid storage tanks, abutments, embankments and factories that can tolerate some settlement, stone columns (also known as granular piles or granular columns) provide an economical method of support in compressible fine-grained soils. Stone columns are either constructed as fully penetrating through a clayey soil layer overlying a firm stratum or as floating (or partially penetrating) with their tips embedded within the clayey soil layer. Numerical analyses have been performed using the software package FLAC3D. The analysis was carried out using Mohr- Coulomb's criterion for soft clay and stones. The numerical results from the FLAC3D are compared with available published results and showed good agreement. The major parameters affecting the group response were identified as area ratio (Ar), normalized column length (L/d), spacing between stone columns (S) and columns diameter (d).