Simulating Oedometer test in PLAXIS - SoilModels

Balaji Bandaru|24.1.2021|Laboratory testing|7 |

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How do I perform oedometer test simulation in PLAXIS

Tags: oedometer plaxis

7 Comments

Oscar Juarez 5 years ago

Hi,
a couple of hints:
Axissymmetric
Horizontally constrained at the sides
Vertically constrained at the bottom
Mesh as coarse as possible (2 Elements)
Vertical load on the top (varies with each load step)
For the output select a Gauss point in one of the 2 elements and display vertical strain vs vertical stress
You shouldn’t have any problems

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- Ayzukra Ablimit 5 years ago
  
  Hi, I was also modelling oedometer test using Plaxis and did what you have mentioned. I am wondering how Plaxis is taking initial void ratio into account and is it possible to obtain the void ratio variation from the output or it should be calculated indirectly from the resultant strains? my goal is to obtain void ratio versus the vertical stress curve.
  
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- Safia EDAOUDI 3 years ago
  
  Hello, I’m trying the same simulation on Abaqus, how can I define steps to simulate unload-reload loops? thank you
  
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Oscar Juarez 5 years ago

Hi,
The vertical strain in an Oedometer test is equal the volumetric strain, and using the simple soil mechanics relationships you can calculate the changes in void ratio or porosity.
I am not sure if Plaxis can do this automatically (I doubt it) but then you have to check this on your own.

Regards,

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- Ayzukra Ablimit 5 years ago
  
  Thank you so much!
  
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- Ayzukra Ablimit 5 years ago
  
  Which material model is the best for modelling stiff clays ?
  
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  - Author
    
    Balaji Bandaru 5 years ago
    
    You can use either hardening soil model, or soft soil and to model the creep behavior, soft soil creep model can also be used

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