A probabilistic concept for determining pile bearing capacity is presented, taking into account the variability of CPT test parameters and methodology of calculation according to the requirements of Eurocode 7 (EN 1997-1: 2004). Based on a single initial (real) CPT test, a larger number of generated (simulation) CPT tests are introduced drawn from solutions of statistics and probability theory. Research has found that the best solutions are achieved using the DA 2 design approach for n(CPT) ≥ 10 tests. Taking into account the deterministic and probabilistic approach in the analysis of pile bearing capacity, it is found that for the DA 2 design approach, the ratio of pile bearing capacity obtained from simulation and the capacity as determined through three methods (Mazurkiewicz, Van der Veen and hyperbolic approximation) is Rc,d /Pu = 1.148. Using the reliability index, the following values of partial resistance factors are obtained: γb,β ≈ 1.1, γs,β ≈ 1.1, which also points to the DA 2 design approach.
Keywords: pile, bearing capacity, CPT test, probability theory, Eurocode 7 (EN 1997-1:2004)