f Comparison between different S waves velocity determination methods in soft formation

In situ determination of elsatic moduli is a helpful tool for geotechnical engineers in evaluation of soil stress-strain response. The link between static elastic moduli obtained in laboratory and dynamic ones have been shown using the frequency dependant Biot’s theory. Soil samples have been collected in a 28 m borehole (See Fig. 6). Density, matrix density and porosity have been determined in laboratory as well as P and S wave velocities in a triaxial cell in order to confined the sample as it was in situ. In addition, static elastic moduli in very small deformation area have been performed.