Analysis of Dynamic Response of Partially Embedded Pile Group with a Consideration of Soil Nonlinearities in Vertical Vibration

Abstract:

As for the problem of pile vibration,the properties of the soils surrounding the pile are always nonlinear,that is,the dynamic module and damping of the soil are associated with the displacements of the pile shaft.In present methods,only constant properties of the soil are adopted,but the nonlinearities are neglected.Based on the achievements of the research on vertical dynamic response of partially embedded pile groups,nonlinearities are taken into consideration through the method of calculating pile shaft displacements and soil properties by iterative method according to the interrelationships between them,and iterative convergence is also analyzed.Taking 3×3 pile group for example,the effect of soil nonlinearities are analyzed,and the relationships between it and the load value are observed.Finally this method is used to predict the dynamic response of the pile group foundation of an offshore wind turbine generator,gaining its impedances and displacement response curves.

Key words:nonlinearity; partially embedded; vertical vibration; iterative method