3D modelling of a pile in soil

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chill
Posts: 12
Joined: Mon Nov 28, 2022 4:45 pm

3D modelling of a pile in soil

Post by chill » Wed Mar 29, 2023 3:31 pm

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?

Thanks.
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forum_3D_model.zip
(926.91 KiB) Downloaded 181 times

STKO Team
Posts: 2301
Joined: Tue Oct 29, 2019 8:45 am

Re: 3D modelling of a pile in soil

Post by STKO Team » Thu Apr 13, 2023 7:55 am

Here's a working file:
3D_Model.zip
(890.06 KiB) Downloaded 177 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
contact_N_wrong.png (50.67 KiB) Viewed 1336 times

In this way, the contact is not working fine, and you experience penetration of pile into soil:
penetration.png
penetration.png (121.16 KiB) Viewed 1336 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
contact_N_correct.png (56.91 KiB) Viewed 1336 times

In this way it works fine:
no compenetration.png
no compenetration.png (192.77 KiB) Viewed 1336 times

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