3D modelling of a pile in soil

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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?

(926.91 KiB) Downloaded 5 times

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Re: 3D modelling of a pile in soil

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

Here's a working file:
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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 46 times

In this way, the contact is not working fine, and you experience penetration of pile into soil:
penetration.png (121.16 KiB) Viewed 46 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 46 times

In this way it works fine:
no compenetration.png
no compenetration.png (192.77 KiB) Viewed 46 times

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