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Re: [Question #689592]: Calibrating paramters under different confining pressure
Question #689592 on Yade changed:
Status: Open => Answered
Luc Sibille proposed the following answer:
First be sure that your model or the calibration is suitable for
describing the soil you consider.
- if the soil is cohesive a calibration on a single triaxial test may
not be enough or a model without inter-particle adhesion will be useless.
- if soil particles are crushable and your model does not take that into
account, again it is useless.
Then, calibration of the mechanical parameters of the model may not be
enough. The initial state of the soil, and its reproduction with the
discrete model is also very important. If the initial state is not
simulated correctly then the model, even with calibrated mechanical
parameters may give a wrong responses.
Finally, be sure that the experimental results have a good repeatability
and are not to much affect by experimental "imperfections" (boundary
conditions, strain localization, etc ...): experimental results are not
necessarily representative of the constitutive behaviour of the soil,
they may be far from that for different reasons.
If all the above points (and others?) are OK then you should be able to
reproduce more or less the soil responses for different confining
pressure with the same mechanical parameters, see for instance:
Sibille et al. (2019) Quantitative prediction of discrete element models
oncomplex loading paths. IJNAMG
Université Grenoble Alpes / IUT1 de Grenoble
Laboratoire 3SR: Sols, Solides, Structures, Risques
Tel lab.: +33 (0)4 76 82 63 48
Tel IUT: +33 (0)4 76 82 53 36
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