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[Chareyre <question679566@xxxxxxxxxxxxxxxxxxxxx>]

Question #679566 on Yade changed:
https://answers.launchpad.net/yade/+question/679566

    Status: Open => Answered

Chareyre proposed the following answer:
Hi,
This is a purely conceptual problem. In lab you can impose total confining
stress, yes, but the effective confining stress is changing nevertheless.
In DEM you don't simulate the fluid, so which one do you record? Effective
or total?
Thats' the effective obviously, and so it is changing just like in lab.
Bruno

Le mar. 26 mars. 2019 02:27, Cloud <question679566@xxxxxxxxxxxxxxxxxxxxx> a
écrit :

> New question #679566 on Yade:
> https://answers.launchpad.net/yade/+question/679566
>
> Hi,
>
> Recently, there is a problem that has been confusing me, that is, using
> DEM to simulate consolidate undrained triaxial tests. In laboratory ,
> consolidated undrained triaxial test require  stability of the confining
> pressure by the servo system,
>  and keep sample volume constant through undrained condition, and these
> two systems are independent and basically do not interfere with each other,
> which means that confining pressure and volume of the sample do not change
> during the shearing process. However, as one of the methods, we set
>
> stressMask = 0
> triax.goal2 = rate
> triax.goal1 = triax.goal3 = - rate/2
>
> to simulate undrained condition in Yade. It seems that only the volume of
> the sample can keep constant, the confining pressure is changing during
> shearing. So is this method not very compatible with laboratory tests? Does
> this have an impact on the accuracy of the simulation results?
>
> Thank you !
> Cloud
>
>
>
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