The paper presents theoretical basis for the construction of local empirical relationships and so-called “interrelationships” from CPTU, SCPTU, SDMT tests and VT (vane test). There are also examples of correlations for overconsolidated and normally consolidated sediments from the group of “transition” soils from the area of Poland. The second part of the paper is dedicated to the use of CPTU and DMT methods in separation of homogenous layers of the subsoil, in the context of stratigraphy, rules are given for construction of model 1-D, 2-D and 3-D quasi. The paper also contains examples and comments on the theoretical basis for the construction of stiffness models of the subsoil in 2-D and quasi-3-D. For the construction of the models, constrained modulus which corresponds to the oedometric modulus was used. The values of this module were determined from the characteristics of penetration from CPTU and DMT tests.

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