Wall-Soil interaction problem with contact2D and PressureDependMultiYield material

[ziyanh]

Dear STKO

I am trying to improve the pseudo-static wall-soil model I posted before with PressureDependMultiYield02 material in order to capture the accumulation of earth pressure during every two constant wall displacements. I have some problems with the model.

After applying 5 cyclic displacements, when the moveable wall is pulled away from the backfill, the soil element always starts failing and intrudes into the wall element. And a small part of the soil element is in tension, which is unrealistic. This makes the model harder to converge. Is it a problem with the contact2D interface or the PressureDependMultiYield02 material?

微信截图_20250325091619.jpg (112.08 KiB) Viewed 2775 times

I attach the model here. What do you think I am doing wrong? Looking forward to your suggestions.

1311.rar

(143.96 KiB) Downloaded 97 times

Best regards
Ziyan

[STKO Team]

Can you try if it works with an elastic material for the soil?