CIU triaxial test in PLAXIS 2D
Hello,
I am currently trying to simulate a CIU triaxial test in PLAXIS 2D, but I keep getting an error during Phase 2 (shearing stage) and I’m not sure what is causing it.
The error message is:
"Soil body seems to collapse. Please inspect Output results. [Error code: 101]"
I have reviewed the output, but I still cannot identify what I did wrong.
My model setup is:
- Phase 1: isotropic confinement stage (σ3′=98 kPa)
- Phase 2: shearing stage
For the material model, I am using Hardening Soil Model with the following parameters:
- c′=0 kPa
- ϕ′=34∘
- ψ=0∘
- E50ref= 24430 kPa
- Eoedref=24430 kPa
- Eurref=73290 kPa
- m=0.5
- pref=100 kPa
- Rf=0.9
- K0=0.441
For excess pore pressure calculation, I used:
- ν-undrained definition
- Direct method
- νu=0.48
In the shearing phase, I maintain the lateral confinement and apply vertical loading at the top boundary.
However, Phase 2 fails and the model collapses.
I followed a YouTube tutorial and a research paper methodology, and the tutorial model works correctly with their parameters, but when I use my own experimental parameters the simulation fails.
Has anyone experienced something similar or knows what could be causing this issue?
Thank you.
