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Ask for a constitutive model for soil with dilantancy and hardening
Dear researchers,
My name is Chi and I just started my PhD study two months ago. I am experimentally and numerically studying the pore pressure build-up in sands during the pile load test and hence, at the first stage, I need to have a constitutive model for soil with both dilatancy and hardening behaviors.
Due to the practical feasibility, I tend to search or build a model developed from Mohr-Coulomb model for soil with only several parameters which can be determined from the conventionl laboratory tests. I heard about some models as Advanced Mohr-Coulomb or Modified Mohr-Coulomb which exit on some commercial software as PLAXIS, DIANA, ABAQUS... However my final goal will be the coupled dynamics-consolidation problem related to pile load test therefore I wish to have a source code of one model and then developed it further.
If any one of you knows about any open-source code for such a constitutive model (Advanced Mohr-Coloumb for soil with both dilatancy and hardening behaviors), could you please tell mehow/where I can find it?
Thank you so much for your help and your time,
Best regards,
Chi
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User material routine will be a choice
Hi,
From what I have read from your post, I think you only need to change the constitutive model of granular materials. Basically, it does not matter whether you are using commercial or open-source FE codes. You only need to search FE code which provides an interface for user material routine. For instance, ABAQUS has a nice UMAT interface, and also FEAP.
BTW, for representing both dilatancy and hardening behaviours, the modified Drucker-Prager model with Cap will be also an option. Time-depedent behaviour is also available in the model implementation in ABAQUS.
Gan
Dear Gan, Thanks for your
Dear Gan,
Thanks for your reply with a good idea about using UMAT routine. I still have some problems which I should clarify from the begining:
1) The final goal of my research will be a problem of coupled dynamics-consolidation analysis since I am dealing with a pile load test in saturated sand, I need to know both the stress-strain states of and the pore pressure in the soil mass. And as I understand (maybe I am wrong), there is no commerical software can perform this coupled dynamics-consolidation analysis.
2) Since I also conduct physical modeling, I preferto use a simple constitutive model with not-too-much parameters which can be determined from the conventional laboratory tests and Advanced/Modified Mohr-Coulomb is what I thought about first.
One more time, thanks for your reply.
Chi
Dear Gan
Dear gan
Im Ali. I faced your problem as well. The best model for your research is Subloading tij model. also if you want to make a dynamic model using ABAQUS/Explicit, you must use VUMAT interface for producing your model.
With regards
Ali.
Ask for a constitutive model for sand
Hi
I'm Msc Student of geotechnical engineering. Im looking for an appropriate model for sands in order to produce a dynamic model for sand compaction piles for estimating the effective radius of them. I have read a Modified Druker prager /cap model but its parameters has modified for a special use of dynamic compaction method by considering the depth effects. In my model, because I am using the plane starin condition, the most important thing is which model can consider the cylindrical expansion of sand compaction piles. I have also read the SUBLOADING Tij model. Now I don't know which model is better. Please help me by your precious suggestions.