In this tutorial, the influence of a vibrating source on its surrounding soil is studied. To reduce the calculation time, only one-quarter of the overall geometry is modelled, using symmetry boundary conditions along the lines of symmetry. The physical damping due to the viscous effects is taken into consideration via Rayleigh damping. Also, due to radial wave propagation, 'geometric damping' can be significant in attenuating the vibration.
The modelling of the boundaries is one of the key points in the dynamic calculation. In order to avoid spurious wave reflections at the model boundaries (which do not exist in reality), special conditions have to be applied in order to absorb waves reaching the boundaries.
This exercise requires a PLAXIS 3D Ultimate license for Dynamics features.
The attached *.p3dlog file contains all the commands to generate the model. With a Bentley Geotechnical SELECT Entitlement [GSE] licence, you can use the commands runner to open the *.p3dlog file and to execute all commands in one go, see also this instruction.
PLAXIS 3D Tutorial 07: Rapid drawdown analysis [Tutorials]
PLAXIS 3D Tutorial 09: Free vibration and earthquake analysis of a building [Tutorials]
PLAXIS 2D Tutorial 13: Dynamic analysis of a generator on an elastic foundation [Tutorials]