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This paper presents the results of a complex investigation executed in Bucharest, Romania by both geotechnical and geophysical techniques. Soil structure has been explored through 20 geotechnical boreholes at maximum 60m depth, which provided hundred of soil samples. A comprehensive set of experimental data on subsoil from oedometer and direct shear tests are analyzed in order to determine the stiffness and strength parameters for cohesive soils. For sands and gravels, the stiffness and strength parameters derived...