Abstract: The bearing capacity and deformation behavior of piles are directly related to the geotechnical parameters of surrounding soil. Extensive reliable insitu test parameters of soil are provided by the flat dilatation test (DMT) and cone penetration test (CPT) devices for the pilesoil interaction analysis. The diameter of 0.4 meters and 12 meters long castinplace concrete pile installed by the long flight auger method was statically load tested for the axial compressive capacity. The load test results were then compared with the threedimensional numerical analysis results using parameters developed from DMT and CPT. The results indicated that, in both axial resistance and the settlement predictions in the numerical analysis, the discrepancies are existed. The parameters using DMT results are closer to the actual test results. The CPT parameters, however, over predict.

Key words: Flat Dilatometer Test (DMT), Cone Penetration Test (CPT), Threedimensional Numerical Analysis, Insitu Tests