Hello Ahmad, One comment I have about a common misunderstanding is about changing the stiffness while no other change is applied on the model. Please check the following article and take it into consideration: https://communities.bentley.com/products…

Dear Ahmad Rahmani , You can move the whole structure using move command. For example I need to move all elements in Y direction for 2 m: I press Ctrl+A to choose all elements. Then I click right mouse button on the «red» elements and click on Selection…

Ahmad, The question you asked combines all tunnel theories and does not have a simple answer. It is the most important part of the tunnel models and can have a severe effect on the results, so don't think it will not matter. Also, it is not related…

Dear Ahmad, Typically it is very difficult to recommend values for material parameters as these highly depend on the surrounding soil you have. I would recommend you checking first our Material Models manual to understand the formulation of the oedometer…

Dear Ahmad, As described in detail by Berk, the interpretation of such FOSs require more attention. Indeed, as stated before me, the soil can be the first to fail instead of a stiff structure, in which case you would expect that when using elastic…

http://etd.lib.metu.edu.tr/upload/12624561/index.pdf Thanks for the attention! Please use the link above.

There is a good chance that FOS with elastic element is wrong because usually structural elements fail before soil. But if soil fails before structural element does, so elastic calculation will yield the same result. Check the thesis.

Safety analysis reduces the soil properties to a level where a proper failure surface is formed and model is no longer stable. During this process, structural forces in elements like plates, anchors etc. rise rapidly. If you use elastic elements, they…

Dear Ahmad, As Berk correctly pointed, the sharp corners are typically locations that there is a high concentration of forces. So, I would expect some high forces in the calculation. I will also check the other post you made.

This behavior is not expected in my opinion. I am sure that someone from Plaxis will comment on this too. Maybe you can post the M, N, Q of each plates (dummy and real plate) so we can compare the behavior better.

Yes, definely. You have a earth pressure from sides and a foundation on the bottom (if we speak in terminology of structural engineers). The sides will try to deform into the center, however, the foundation will try to hold it in place. This creates shear…