Finite difference computational modelling of marine impact pile driving
Invited paper
JASCO Applied Sciences
Monday 1 june, 2015, 17:20 - 17:40
0.2 Berlin (90)
Abstract:
Computational models based on the finite difference (FD) method can be
successfully used to predict underwater pressure waves generated by marine
impact pile driving. FD-based models typically discretize the equations of
motion for a cylindrical shell to model the vibrations of a submerged pile in
the time-domain. However, because the dynamics of a driven pile are complex,
realistic models must also incorporate physics of the driving hammer and
surrounding acousto-elastic media into the FD formulation. This paper
discusses several of the different physical phenomena involved, and shows some
approaches to simulating them using the FD method. Topics include dynamics of
the hammer and its coupling to the pile head, transmission of axial pile
vibrations into the soil, energy dissipation at the pile wall due to friction,
acousto-elastic coupling to the surrounding media, and near-field versus far-
field propagation modelling. Furthermore, this paper considers the physical
parameters required for predictive modelling of pile driving noise in
conjunction with some practical considerations about how to determine these
parameters for real-world scenarios.