I’m modelling a steel tapered pile embedded in sand (Half-model) using the following steps:
1. Geostatic step for the soil (with the pile de-activetd)
2. Removing the part of the soil representing the pile opening
3. Resetting the displacement to zero (BC). I made this step since very little displacements are left after the geostatic step (in order of 5x10^-4m) so that when I activate the pile in the following step it can fit in
4. Activating the pile
5. Activation of the pile soil interaction properties
Until this point I have no problem, but then when I wanted to remove the soil movement restraint (in step 3) the soil seems to bulge up around the lower area of the pile.
I thought that this could be due to the pile taper where the displacement of the soil created a tiny space from which the soil escaped...I thought of tying the two surfaces using constraints(pile –soil) but I didnt find a way for activating it in a certain step (it has to be activated throughout all the steps)
I also tried not allowing “separation” in the interaction properties however it still didn’t get any better.
I also tried applying a load to the pile so that it slightly moves down and hence close any opening(in case) but again it didn’t work.
I would really appreciate if you can help me with this. I’m new to Abaqus and I’m really having hard time to run this model