Abstract
One of the main parameters characterizing soil deformations is the deformation modulus, which can be determined in the laboratory with an oedometer or a triaxial test device. The authors conducted experimental tests with the oedometer and triaxial test apparatuses with eight different type soils. Experimental data for eight types of sands, clays, silts with specially mixed grain size distribution curves, having different non-plastic fines contents, mean grain sizes and uniformity coefficients, were analyzed. In general, the deformation modulus obtained from the triaxial test is higher than that obtained from the oedometer test, due to the difference in loading conditions. It is important to take into account the specific properties of the soil, like particles form, and test conditions when comparing the values of the deformation modulus obtained by performing different laboratory tests. Also, it is very important to know the magnitude of the loads and the type of foundation when assessing ground deformations.
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