The paper comments the usability of classification charts developed for CPTU and DMT tests for the identification of organic soils. The results of the evaluation of shear strength and deformation parameters of organic subsoil by in situ tests were also interpreted. The results of the investigations confirmed the necessity to use different correction factors for estimation of constrained modulus from CPTU and DMT tests. The analyses of the relationship between undrained shear strength from vane test and CPTU proved that N_(kt) factor is strongly dependent on the type of organic soil and variables which define this soil.
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