Dear Prof. Masin and Soil Model Community,
I am using HP clay subroutine in Plaxis 3D to simulate soil structure interaction problem. I want void ratio and OCR variation along the depth to back analyse centrifuge test. In Plaxis, either or OCR remains constant depending on input. Moreover, I found HP subroutine in plaxis calculate void ratio without considering kheppa line. Please see details and explanations in the attached images. My objective is to obtained initial void ratio and OCR variation along the model depth. Also, I want to confirm the position of e input in parameters in ln(1+e) – lnp space. Thanks
HP clay subroutine in Plaxis
Related Articles
-
Skin friction along depth of pile
Md Shafiqul Islam||Finite Elements|0 |
Views 3,628
Dear all, I am simulating static pile load test in the rock by using ABAQUS. For comparison of numerical results with the experimental, I need skin friction vs depth plot. […] -
Modeling of triaxial test sample by using hypoplastic subroutine
Naif Alsanabani||Finite Elements|7 |
Views 4,341
I tried to model sample of triaxial test in Abaqus program. I used hypoplastic subroutine. The parameters used in hypoplastic model was Hochstetten sand the given in website “https://web.natur.cuni.cz/uhigug/masin/plaxumat/node5.html”. The […] -
Small displacements when using HP model in Plaxis 3D
Arno Crous||Finite Elements|4 |
Views 3,604
I am modelling sand slopes in Plaxis 3D using an HP model. I am using soil parameters from “Modelling of Soil Behaviour with Hypoplasticity” by David Masin (2019). During the […] -
How to replicate results for vertical cut in FEM program
Amine Aboufirass||Finite Elements|0 |
Views 3,775
The equations for a vertical cut in cohesive material are given in several publications including Heyman (1973): The stability of a vertical cut (see attachment Equations1.jpeg) and Verruijt (2001) Soil […] -
Consideration of Ko using HP clay model
muhammad shakeel||Finite Elements|1 |
Views 3,720
Dear SoilModels community Dear Prof. Masin / all I want to know how HP model considers Ko variation for the following cases: Ko with variation with OCR? Ko determination related […] -
Modeling cyclic undrained sandy soil triaxial test using ABAQUS
Shile Dong||Finite Elements|3 |
Views 4,218
Dear all, I am trying to use Abaqus to modeling undrained cyclic triaxial test for liquefiable soil. I am wondering how could I applied the cyclic load. I should apply […] -
ABAQUS UMAT of hypoplastic clay model
Akhtyar Gul Shirzoi||Finite Elements|2 |
Views 966
Hi Everyone. I am new to this Platform. I want to use the hypoplastic model in my research. how I can download it UMAT file for ABAQUS software? -
PM4Silt software
Daniel Valencia||Finite Elements|5 |
Views 3,733
Hello everybody, Does somebody know a FEM Software with the implementation of PM4Silt model’s routine? I mean, one different from FLAC. Thanks for your help.
Who is Online
No one is online right now
Search SoilModels Website
Recent posts
-
Suggestions for an Advanced Constitutive Model in FEM-Based Dynamic Slope Stability Analysis 12.2.2025
-
Hardening Soil or Hardening Soil-Small umat in Abaqus 2.1.2025
-
hypoplastic interface 11.12.2024
-
Triaxial Test Driver SANISAND 30.10.2024
-
REQUEST FOR EXPRESSIONS OF INTEREST (REOI) FOR PROJECT IN CONSTITUTIVE MODELLING 23.10.2024
-
Programme of the ALERT Olek Zienkiewicz school on Constitutive Modelling of Geomaterials, February 3 to 7, 2025, Prague, Czech Republic 11.10.2024
-
Connecting remote sensors to the Plaxis FEM 3D using python 26.7.2024
-
Intergranular Strain Extensions 16.7.2024
-
Abaqus Hypoplasticity Primary Variable Is Not Available 1.7.2024
-
Vumat to calculate excess pore in Coupled Eulerian-Lagrangian ABAQUS 1.7.2024
-
Drucker Prager Cap Hardening Model 20.6.2024
-
Soil model for sand under drained cyclic loading 15.6.2024
Recent Comments
- Ulas Cilingir on SANISAND for FLAC3D Download
- Pouya Zahedi on UMAT Code for Modified Cam Clay model
- Xiuzhe Wang on Hypoplasticity sand convergence issues
- Zheng Wanying on Example of FLAC3D data file
- Zheng Wanying on SANISAND for FLAC3D Download
- Anis Kheffache on Problem in using Hypoplastic model for sand in Abaqus.
- Micha Van der Sloot on PM4Sand for Plaxis Download
- Kiruthika Perumal on PM4Sand for Plaxis Download
- Shishir Kumar Sikder Amit on Mohr Coulomb umat in Abaqus
- Zhentao Liu on Hypoplasticity sand convergence issues
- Zhentao Liu on Combining Hypoplastic-sand and Hypoplastic-clay in one UMAT file
- Sumin Song on Clay and Sand hypoplasticity UMAT and Plaxis implementations, including UMAT-Plaxis interface
- KHA DIDJA on Issue in applying SANISAND04 UMAT to Boundary-Value-Problem
- Zhentao Liu on Problem in simulating CPT using SANISAND04
- Jin-Hu Li on Problem in simulating CPT using SANISAND04
- Johan Clausen on Triaxial compression test using Mohr-Coulomb model in Abaqus
- Ismail Khan on SANISAND for FLAC3D Download
- Tao Zhu on UMAT and oneAPI compiler issues. (SOLVED…i hope :p)
Dear Muhammad,
Actually, there are these two options only, initialise through constant void ratio or constant OCR. By the way, these only work with “K0 initilisation procedure”. With gravity loading procedure, void ratio will redictribute during gravity loading. If you need more complex distribution of void ratio with depth, you will have to approximate it through using many soil layers which will have the same parameters, just different initial void ratio.
Regards David
Dear Prof. Masin,
Thanks for your reply.
May I know how the model calculate undrained shear strength (cu)? Is it based on initial void ratio like critical state frame work or some other way? My concern is, if void ratio is constant along the model depth how can we obtained increasing cu along the depth with increasing effective stresses having constant void ratio?
Thanks for your help.
Regards,
Muhammad
Hi Muhammad,
Yes, HP model calculates cu based on the critical state soil mechanics framework. If you set constant void ratio with depth, you get constant undrained shear strength with depth. You can either initialise OCR, than cu will be distributed over depth based on that OCR. Or, you need to define layers with different void ratios.
David
Hi both,
Does this mean that the undrained shear strength can therefore be calculated for the hypoplastic model using the same formula for the MCC model:
Su=M/2 exp^(((Γ-1-e)/λ))
Cheers,
Hashmi
Just with a difference that in the oridnary Modified Cam clay normal compression lines are considered as linear in p vs 1+e plane, whereas hypoplastic model adopts Butterfield’s formulation with normal compression line linear in ln(1+e) vs ln p plane, so the equation needs to be updated accordingly. David