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3D modelling of a pile in soil

Posted: Wed Mar 29, 2023 3:31 pm
by chill
Hi I am trying to model a pile as 3D in a Drucker Prager soil (model attached), but I am having convergence issues (the model is not partitioned in the form sent, but that is not the issue, its within the analysis itself as it runs the first 2/3 stages when I partition it) and connot see what I have done wrong, would you be able to help please?


Re: 3D modelling of a pile in soil

Posted: Thu Apr 13, 2023 7:55 am
by STKO Team
Here's a working file:
(890.06 KiB) Downloaded 21 times

You are using the "From Local Axes" option in contact, but you didn't assign any local axes to the interaction. Therefore, they will have their default one, with Normal = global Z (0,0,1):
contact_N_wrong.png (50.67 KiB) Viewed 547 times

In this way, the contact is not working fine, and you experience penetration of pile into soil:
penetration.png (121.16 KiB) Viewed 547 times

Instead you need a Cylindrical local axes, with center at the center of the pile, so that the Normal vector will be radial (from master beam to slave soil):
contact_N_correct.png (56.91 KiB) Viewed 547 times

In this way it works fine:
no compenetration.png
no compenetration.png (192.77 KiB) Viewed 547 times