Shear modulus reduction and material damping curves measured with resonant column device on cohesive soils from the Ljubljana Marsh

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4. Shear modulus reduction and material damping curves measured with resonant column device on cohesive soils from the Ljubljana Marsh

In recent decades, the expansion of the Slovenian capital of Ljubljana has focused primarily on the Ljubljana Marsh. The uppermost layers of the Ljubljana Marsh consist of soft lacustrine sediments, which pose considerable geotechnical challenges. In order to better predict the soil behaviour under dynamic and static loading, it is important to determine the dynamic soil properties, which are usually represented by the shear modulus reduction curve normalised to the initial shear modulus and the material damping as a function of shear strain. In the absence of specific measurements on local soils, the dynamic soil properties are often taken from the literature, assuming that soils with similar intrinsic properties exhibit similar behaviour. It should be noted that the different empirical models are not always directly comparable. In addition, the authors give a wide range of measurements for soils with similar intrinsic properties in the literature.

In this study, we evaluate the applicability and reliability of the empirical correlations of dynamic soil properties by comparing them with laboratory measurements of soft soils in the Ljubljana Marsh. The dynamic soil properties were measured using a resonant column with integrated bender elements, which increased the reliability of the measurements. Given the significant differences between empirical models, it is critical to account for these differences in soil behaviour, which necessitates sensitivity analyses in engineering practise. The study also emphasises the importance of direct measurements of dynamic soil properties, especially at sites where the empirical relationships have not yet been confirmed.

28th European Young Geotechnical Engineers Conference (EYGEC2024)

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