Dear all, 

I am trying to model pile soil interaction. I have a short rigid pile in undrained clay, I use C3D8RP for my soil and C3D8R for my pile. At this stage I used Mohr-Coulomb model. I can see that my Geostatic step gives the correct values of displacements and stresses, but when I go to the results and I run Animate Time History , I can see that the pile punches into the soil under its self weight and the geometry of the pile changes (Diameter increases) and the soil disturbance is very strange. 

Is there any way that I can model the case without having the pile sinks into the soil under its own self weight please?.

I appreciate your help , and thank you in advance.

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