The frozen and unfrozen soil model

Hi, 

I am a new user to USDM - Frozen and unfrozen soil model. I have read the Plaxis documentation on Frozen and unfrozen soil model (2016) and trying to model the example of chilled pipeline in Plaxis 2D provided in the document. However, after K0 procedure in initial phase, as soon as the analysis type changed to fully coupled analysis in next phase, the soil body collapsed. I can see the whole soil body moves upward and large water flow near bottom boundary. Apparently, I made a mistake defining some the parameters correctly and I am not sure which one. Is it possible to get the Plaxis models of those examples mentioned in the 'Frozen and unfrozen soil model (2016)' ? It will be very helpful for me understand the model better and find out, where I was making a mistake. If not, any other example with Frozen and unfrozen soil model would be great too.

Thank a lot in advance.

Best regards, 
Waseem Ahmad