Hi David,
Can you please provide some comments on the ability of the Hypoplasticity model with intergranular strain concept to model the effects of recent stress history on the clay stiffness?
Many thanks,
Hashmi
Related Articles
-
Input files for element tests for hypoplastic clay/sand UMAT
I’m interested in using the model for simulating excavations in clay, where the small strain modulus is important, and the analysis has to be transient consolidation. It would be helpful […] -
UMAT in Geotechnics
Hi Everyone! I am a research Intern at Laval University, my project is about the effect of soil structure interaction on the seismic design of Geostructures. Exactly we want to […] -
sand liquefaction modelling in Anura3D
Beginner level question for this forum – Trying to replace a Mohr-Coulomb model of sand in an Anura3D simulation with a material model which accurately describes sand liquefaction. References I’ve […] -
Calibration of the von Wolffersdorff model using Genetic Algorithms
I am happy to announce that our pre-print paper, “Calibration of the von Wolffersdorff model using Genetic Algorithms”, is available on researchgate: https://www.researchgate.net/publication/342198062_Calibration_of_the_von_Wolffersdorff_model_using_Genetic_Algorithms. In this article, we propose a novel […] -
Non-local regularization: Need VUMAT of Mohr-Coulomb model in abaqus
Dear Community, I want to include a non-local regularization technique in the built-in Mohr-Coulomb model of abaqus to capture the strain-localization effects. I am trying to find the original VUMAT […] -
Abaqus UEL Hypoplasticity
Dear all, I want to implement a new user element using the UEL subroutine. To simulate dynamic cases, one has to define the mass, damping and stiffness matrix then build […] -
-
MatLab m.file
Hi everyone, I’m trying to simulate a triaxial test by using Matlab, adopting the sand hypoplasticity model with strain softening but so far couldn’t succeed. Would anyone help me with […]
Supporting Organisations
Recent posts
-
Paper of Coulomb, C. A. (1773) 15.4.2024
-
ABAQUS UMAT of hypoplastic clay model 6.4.2024
-
Prague Geotechnical Days 2024 “Geotechnical monitoring” and 30th jubilee Prague Geotechnical Lecture by prof. Eduardo Alonso 5.4.2024
-
UMAT for Creep-SCLAY model. 1.3.2024
-
Cyclic tests with Triax element test driver 14.2.2024
-
SUMMER SCHOOL ‘Numerical Modelling in Geotechnical Engineering’, Innsbruck – July 22nd-26th, 2024 1.2.2024
-
COURSE IN SOIL MODELING – NTNU, Trondheim – October 14th to 18th, 2024 21.12.2023
-
MSE walls design in Plaxis 11.12.2023
-
sand liquefaction modelling in Anura3D 8.12.2023
-
BCV bentonite experimental and modelling datasets 14.11.2023
-
Challenges in simulating geomechanical models using Mohr-Coulomb with Tension Cut-Off in Abaqus 20.10.2023
-
Analys soil liquefaction with Abaqus under blast load 19.10.2023
“Elasto-plastic” people call it recent stress history, “hypoplastic” people call it intergranular strain, but this is the same thing at the end. This is already shown in the original intergranular strain concept paper, which you can download from SoilModels database: Niemunis, A. and Herle I. (1997) Hypoplastic model for cohesionless soils with elastic strain range. Mechanics of Cohesive-Frictional Materials 2: 279–299
Thanks for the response David.
I asked the above question because I used Triax to reproduce a drained contant p’ triaxial test with stress reversals (90, 0, -90 and 180 degrees), and the results did not match too well with the triaxial data after calibrating the required parameters. However, the hypoplastic model has given me much better results of surface settlement behind wall and ground heave, when I backanalysed a retaining wall centrifuge test using FE.
I am trying to obtain an estimate of the calculated Su profile with depth in my FE model. Can you please advise how I should do it using the outputs of the hypoplastic analysis? I could only find Equation 6.22 in your textbook in relation to Su.