Comparison between soil properties derived from CPT tests and laboratory tests

Loose sands or very soft clays are sometimes hard to evaluate from geotechnical purposes with classical methods. The aim of the work is to estimate the applicability and reliability of some of the most popular relations derived from CPT in the case of marine sediments of Black Sea. The paper presents comparisons between values of main geotechnical parameters derived by well known formulas from CPT and laboratory tests executed on remoulded samples of such soils. In the first instance a classical soil behaviour chart was used in conjunction with grain size analyses. In the next step estimations of saturated or dry unit weights and friction angle of cohesionless submersed soils, based on well known relations was found in very good agreement with lab test values obtained from thin‐walled tube samples. Finally, the evaluation of the state of stress puts in evidence that the investigated deposits are mainly under consolidate or normal consolidate and at least one of three different classical relations for the estimation of relative densities, fits well with values of lab tests.