In Slovakia, dynamic penetration is a widely used field test for soil investigation. The test is relatively simple and is recommended to be used mainly in coarse-grained soils because of the smaller friction. The results of the test are used to determine soil profile and to predict or estimate soil properties. The estimation of soil properties by dynamic penetration is quite beneficial especially in cases where it is difficult to extract representative undisturbed soil sample. In coarse-grained soils the test is used for determination of relative density, angle of shear strength, or deformation modulus (Edef). In this article we assess the deformation modulus of fluvial poor-graded gravels from dynamic penetration and oedometric test. First, the deformation modulus was determined from the results of a heavy dynamic penetration carried out near Bratislava. A Slovak correlation derived by various authors was used for the assessment of Edef. In most cases, these correlations only consider the soil class or its composition as a determining factor and do not include the soil genesis, which also influences the determination of soil properties. Therefore, in the second part of the research, the deformation modulus was investigated in the laboratory, where a series of large-scale oedometric tests were performed. The test consisted of two loading cycles during which the deformation modulus was measured. Subsequently, the results obtained from the heavy dynamic penetration test were statistically processed, and the characteristic value was derived. In the end, the measured results from the field and laboratory tests were analyzed and compared.

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