In geotechnical design of structures according to the rules and regulations given in Eurocode 7 (EN 1997-1, 2:2004. Eurocode 7 – Geotechnical design. Part 1, 2), the standard recommended for use since 2010 in the European Union, one of the most important engineering tasks is the selection of parameters to examine all of the possible limit states. In determining the characteristic values of geotechnical parameters, including strength and deformation must be as careful and thoughtful use statistical methods, both classical and Bayesian approach. Bayesian statistical analysis is justified especially in the case of disposition and consideration in the selection of parameter values a priori, for example, the expert geotechnical parameters, or if the possibility of enlarging the number of sets of parameters and geotechnical data, which forms the basis for observational method. The paper presents examples of geotechnical data analysis using Bayesian theory, the aim was to determine the effect of a range of geotechnical investigations, including the number and type of soundings and their distance from the proposed facility on the characteristic parameters of the substrate. In addition, it shows the importance of Bayesian theory in the design of footings for use in designing methods of observation. The results of the analysis indicate the usefulness of Bayesian theory in solving many tasks geotechnical.

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