Validazione di un modello 3D per l’interazione dinamica terreno-struttura mediante prove in sito su fondazioni profonde

In the present paper, a twofold validation of a numerical model developed by the authors for the kinematic and inertial soil-pile-structure interaction analyses, based on results of full scale in-situ experimental tests is presented and discussed. The model, originally developed for groups of vertical piles in layered soils and recently updated to consider pile inclination, accounts for pile–soil–pile interaction and radiation problem by means of elastodynamic Green’s functions. The validation is based on in situ data deriving from two different experimental campaigns. The first campaign concerns three steel pipe piles in a near shore environment, tested by means of impact and snap back tests; strains along the shaft of the source pile and acceleration on the top of source and receiver piles were acquired. The second set of experimental data have been obtained during an experimental campaign on both two single vertical micropiles and on a group of inclined micropiles in an alluvial soil deposit, where ambient vibration tests, impact load tests, snap back tests and forced vibration tests were performed. Finally, the comparison between numerical and experimental data in terms of dynamic impedance of the system is discussed, and the ability of the proposed model to simulate soil-pile-interaction phenomena is evaluated for different typologies of deep foundations.