Abstract
Strength and deformation parameters are used on every step of a foundation engineering design. They are necessary for the initial estimation of the subsoil bearing capacity and also for acceptance of the final method of the construction foundation. There are many effective in situ methods for the evaluation of these parameters. Based on data from the Marchetti dilatometer (DMT) tests obtained from the experimental Stegny site and the planned WULS-SGGW stadium, analysis and interpretation of results was performed. The uncertainty obtained from DMT tests is shown by mathematical methods. Selection criteria of the testing technique are presented. Limitations concerning the applied methods and the complex interpretation of the results of in situ investigations are shown.