This paper presents the back-analyses of field loading tests carried out with bored pile and drilled shaft founded in a tropical soil executed in the University of Brasília experimental research site. For this, a numerical simulation was carried via existing commercial application software denominated GEO4. This software computes the load-displacement curve of the pile’s head plus, distribution of normal and shear forces along the pile’s shaft. The Shear behavior of pile-soil interface is described using the elastic-plastic material model with Mohr-Coulomb yield condition. The complete response of any foundations is represented by determination of shaft and toe resistance plus settlement analyses.
Hence, this paper focused in the determination of components of resistance (angle friction and cohesion) and settlement (Young Modulus) for this type of foundation, and explains and presents, in details, the software GEO4 from Fine Inc. Ltd. for foundation design. In relation to the cohesion, it was verified the important effect that this parameter have in the determination of shaft resistance. Moreover, few research topics nowadays deal with the determination of this particular parameter for bored piles. The assessment of geotechnical parameter is a vital component of geotechnical design and some formulation are also presented for this evaluation.