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[Jan Stránský <question688979@xxxxxxxxxxxxxxxxxxxxx>]

Question #688979 on Yade changed:
https://answers.launchpad.net/yade/+question/688979

Jan Stránský proposed the following answer:
> Under the action of cyclic shear load, the effective stress gradually
decreases as the number of cycles increases.

this is experiment, right?

> If the material is anisotropic, will there be an effect on the
effective stress?

I was talking about **elastic** material, just as an example how to demonstrate that the decrease of normal stress due to shear strain is not "automatic".
Yes, for **elastic** anisotropic material, there could (depending on the type of anisotropy and orientation) be effect of shear strain on normal stress.
The granular material may or may not behave like elastic, depending on many factors, but usually at leas friction makes the material not elastic.

> In addition, I would like to ask whether pore pressure is considered
in the periodic undrained triaxial shear test?

Not directly, but I remember some publications (e.g. [2,3], seems to be
a similar topic, they are using Yade) considering water pressure somehow
(did not read it really in detail)

cheers
Jan

[2] E. L. Martin, C. Thornton, S. Utili, "Micromechanical investigation of liquefaction of granular media by cyclic 3D DEM tests", Géotechnique, 2019
[3] https://www.icevirtuallibrary.com/doi/abs/10.1680/jgeot.18.P.267

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