In the paper the discussion of problems and doubts when analyzing deep foundations, mainly whilst determining soil parameters. Problems and doubts regarding geotechnical calculations, their source as well as methods and solutions to improve compatibility of calculated and measured displacements of buildings are also described. In this part the author examines the possibilities of implementation and the accuracy of the principles of geotechnical parameters modification for soil layers deposited at depths. This has been done on the basis of local relationships taking into account changes in soil stiffness for very small strains. The author discusses cases of such benchmarks utilization and their application benefits as well as presents modifications to parameters defined based on Polish standard PN-81/B-03020 in numerical simulations of deep foundations.

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