This paper presents backanalysis of field loading tests in bored pile and drilled shaft performed on tropical soil at the experimental research site of the University of Brasilia. The numerical simulation was carried out using the commercial software GEO4 from FINE Ltd. This software computes the load-displacement curve on the pile head and the distribution of normal and shear forces along the shaft. The shear behavior of the pile-soil interface is described according to a modified Mohr-Coulomb's theory. This paper also focuses on the determination of the parameters of strength (angle friction and cohesion) and settlement (Young modulus) for deep foundation. The use of GEO4 for foundation design is explained in details herein. Cohesion was verified to be of important effect when calculating the shaft strength. The assessment of geotechnical parameters is a vital component of geotechnical design and some formulations are also presented for this evaluation.
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