propagatingPorePressureWaveOverPlateOnSeabed:
biotFoam solution.
Propagating pressure wave on top of soil domain with free traction for soil skeleton.
See video and descrition here:
http://www.youtube.com/watch?v=9pZdtnjf07I

suddenSqueezeOnPlateOnSeabed:
Pore pressure on seabed corresponding to hydrostatic with 1 m of water on top.
Zero pore pressure gradient and displacement on sides and bottom.
Sudden downwards pointing force on plate on seabed.
See video and descrition here:
http://www.youtube.com/watch?v=slgnGkWIzFo