Abstract: Both the static loading test ingle Cement-Fly-ash and Gravel (CFG) column and the numerical analysis of the composite foundations formed by the CFG columns are performed in order to evaluate the soil improvement results using CFG columns. Three CFG columns were statically loading tested and the results were used to calibrate the numerical analysis results. The calibrated parameters were used in the numerical analysis by using FLAC3D finite different analysis commercial software on an area of 20 by 20 meters. The numerical analysis simulated ground settlement of ground with and without CFG columns. The results indicated that both the settlement and the stress distributions in the composite ground with CFG columns are significantly different. The CFG columns share the portion of the stress and improve the soft soils.

Key words: Soft Soil Area, CFG Column Composite Foundation, Static Loading Test, Numerical Simulation, Finite Difference Analysis