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 […]
Archive for category: Forum
Hi, I am doing Plane strain 2D simulation of GRPS embankment in ABAQUS, i encountered a problem that results of with geogrid and without geogrid both are showing same deflection. […]
Rate dependent plastic yield in Tochnog Question
Marlon Hahn||Constitutive Modelling|0 |
Views 3,997
Hi, I am new to Tochnog and really appreciate the open source modeling chain (gmsh->Tochnog->paraview). So far, I’m only familiar with commercial codes, e.g. Abaqus. I actually deal with metal […]
need help in Flac3d6
Ahmed Mahir||Constitutive Modelling|0 |
Views 4,113
dear user hello i intend to build a numerical model using flac3d 6 software i build the geometry with extrusion pane and set all values for pile – soil interaction […]
SImulation with hypoplastic model for granular materials in ABAQUS
yusheng yang||Constitutive Modelling|2 |
Views 4,396
Hello, I want to use the hypoplastic model for granular materials downloaded from https://soilmodels.com/download/plaxis-umat-hypoplas-zip. The UMAT file umat.for is the model for sand. I followed the instruction https://web.natur.cuni.cz/uhigug/masin/plaxumat/node5.html. I have […]
Cyclic Behavior of Sand
MOHD SAQIB||Constitutive Modelling|3 |
Views 3,965
Hello, Is there any constitutive model for sand which can simulate the number of cycles to reach the critical state. I used the SANISAND model but it is not promising. […]
Hypoplastic model for clays in a Plaxis 2D simulation – Problem
Daniel Valencia||Finite Elements|2 |
Views 3,274
Hello everybody, Using Hypoplastic model for clays, with intergranular concept parameters, I am simulating a simple oedometer test, phase by phase, using a dummy layer on the top of the […]
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 […]
Sanisand umat with BV problem
Luis Aviles||Constitutive Modelling|0 |
Views 3,851
Hi, Does someone know if sanisand implementation has been used in a boundary value problem for slope? do you have any references? Thanks very much!
Looking for help
Axel Grauwinkel||Constitutive Modelling|4 |
Views 352
Hello guys. I just tried to calibrate on soilmodels. I´ve done three CIUP-REC-test plus one oedometric test. As you can see in the images, that there is still something quite […]
DIANA 10.4 released with full Geotechnical possibilities 3D as always, but now also 2D!
Ab van den bos||Finite Elements|0 |
Views 3,428
We are pleased to announce that DIANA 10.4 is released with full 2D geotechnical possibilities. DIANA is already easy to use for full 3D geotechnical models, and now the more […]
Free Tochnog Professional list of capabilities and papers
Dennis Roddeman||Finite Elements|0 |
Views 3,355
Dear All, you can find a list with some of Tochnog Professional capabilities and application papers at: http://www.tochnogprofessional.nl/Tochnog_Professional_wikipedia_format.pdf Stay safe, Dennis Roddeman
Hi all Just a short question on the modification of the intergranular strain concept proposed by Wegener & Herle (2014) to limit strain accumulation. In terms of the numerical implementation […]
PhD position on thermo-hydro-mechanical coupling in slope stability (Charles University)
Gianvito Scaringi||Position Announcements|0 |
Views 1,206
A second PhD position in soil mechanics is available at Charles University. Topic: Effects of thermo-hydro-mechanical coupling on slope deformation in expansive clays: advanced experiments and hypoplastic modelling. Starting date: […]
PhD position at Charles University on experimental investigation of thermally loaded bentonite
Jan Najser||Position Announcements|0 |
Views 996
A new PhD position in experimental soil mechanics is open at Charles University. Starting date October 2020, topic: Evaluation of hydromechanical properties of bentonite subjected to thermal loading. Further information […]
How to implement this Hypoplastic Interface Model into ABAQUS combined with the existing hypoplastic model subroutine
Geyang Song||Constitutive Modelling|8 |
Views 4,537
Hello: I’m a post-doc at the University of Nottingham, and I’m using the hypoplastic model to simulate the centrifuge tests we did. The research area is related to soil-pile interaction. […]
Implimentation of SANISAND constitutive model in ABAQUS/Standard for a soil-monopile interaction
philip alkhoury||Constitutive Modelling|4 |
Views 5,202
Dear all, I am trying to model soil-monopile interaction (3D) in ABAQUS/Standard in order to perform subsequently a cyclic and dynamic analysis. For the soil I am using the SANISAND […]
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 […]
hypoplasticity models in free Tochnog Professional
Silvia Imposimato||Finite Elements|0 |
Views 3,612
In this post we will list built-in hypoplasticity formulations in the free Tochnog Professional program. Since these hypoplasticity options are built-in there is no need to link external umat routines. […]
Problems with the UMAT subroutine check_parms_DM of the SANISAND constitutive model
meng xiaowei||Constitutive Modelling|3 |
Views 4,366
Where can I find the source of the content in the picture below in the UMAT subroutine check_parms_DM of the SANISAND constitutive model?
Dear All, We posted a small overview movie of Tochnog Professional in YouTube. For more movies see the complete channel.
Tochnog Professional becomes free
Dennis Roddeman||Finite Elements|0 |
Views 3,495
After several decades of development we are happy to announce that the Tochnog Professional finite element program has become free. Both for academic and commercial use. We are extremely grateful […]
3D analysis with Basic Hypo-Plastic Model
sobhan abedinnejad||Constitutive Modelling|2 |
Views 3,926
Dear all Is the basic Hypo-Plastic model (Wollffersdorff’s model) suitable for 3D models? Can I analyze 3D models with this UMAT? (https://soilmodels.com/download/umat-hyposand-uibk/) Thank you Sobhan
Modified Cam clay model now supported in automatic calibration software ExCalibre
David Mašín||Constitutive Modelling|6 |
Views 4,821
Free SoilModels automatic calibration software ExCalibre, available at, https://soilmodels.com/excalibre/, now supports Modified Cam clay model. This is both for laboratory test simulation as well as for automatic calibration. We hope […]
Shear Stiffness Calculation for Hypoplastic Model
Hashmi Sohawon||Constitutive Modelling|4 |
Views 4,160
Hi David, I have reproduced some single elements test on ABAQUS using the UMAT to compare with Triax Hypoplasticity. So far, my stiffness curve (q vs ea) and my stress […]
DIANA with monopile follows Blum theory saving 10 m of length
Ab van den bos||Finite Elements|0 |
Views 3,322
Where the client was forced to make all his horizontal loaded Dolphins (piles) 10 m longer we could trustworthy proof that this actually was not necessary saving millions of cost […]
Hypoplastic UMAT error ABAQUS
Hashmi Sohawon||Constitutive Modelling|2 |
Views 4,837
Hi all, I wanted to ask if anyone has experienced this error before when running the Hypoplastic UMAT (umat_hcea.for) on Abaqus? “Abaqus Error: The executable standard.exe aborted with system error […]
finite element modeling of ISA-HP for sand material
arad ahmadi radin||Finite Elements|1 |
Views 3,347
On the simulation of the cyclic mobility effect with an ISA -hypoplastic hypoplastic hypoplastic model, is it possible to simulate 3D liquefiable sandy soil by available u-mat file which is […]
Sanisand model
sahar saab||Constitutive Modelling|1 |
Views 4,238
Is the Sanisand constitutive model 3 dimensional? Could it be used for dry sand cases using C4D8 elements? (drained sand) Is it possible to apply it in a dynamic implicit […]
Hi David, I am trying to reproduce some Triaxial data from Coop et al. (1995) using the Hypoplastic Model with Intergranular Strain Concept on Triax. So far, I cannot get […]
Geostatic method for Abaqus/Explicit
Joe Chu||Finite Elements|3 |
Views 4,843
Dear all, I recently conducted a numerical simulation of pile-soil interaction. I digged a vertical hole and insert the pile into that with general contact. Due to many reasons, I […]
Calibrate hypoplastic model
sahar saab||Finite Elements|2 |
Views 3,354
I am trying to calibrate my sand using Excalibre. I tried some triaxial element tests using Abaqus. However the results are different between Excalibre and Abaqus.
problem with sanisand umat
yousef zand||Finite Elements|8 |
Views 3,660
Dear all, I’m trying to model multilayer soil in abaqus. To use the SaniSand umat in model I use the following parameters but no plastic strain at all. The unit […]
Modeling of triaxial test sample by using hypoplastic subroutine
Naif Alsanabani||Finite Elements|7 |
Views 3,969
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 […]
A problem of convergence from using Hypoplastic model in Abaqus
Joe Chu||Finite Elements|5 |
Views 3,660
Dear all, The sand hypoplastic model has been used to simulate the interaction between soil and pile. However, there is a bad convergence in the process of calculation. When I […]
Hypo-sand UMAT problem
sobhan abedinnejad||Constitutive Modelling|2 |
Views 4,213
Dear community I have 4 Question in implementation of Hypo-sand Umat in ABAQUS could someone kindly explain? 1. I checked the Umat file from (https://soilmodels.com/download/plaxis-umat-hypoplas-zip/) and i understand this subroutine […]
Some confusion about the parameters in Abaqus umat of Hypoplastic Modeling
Joe Chu||Finite Elements|1 |
Views 3,360
Dear all, When I check the umat file of sand hypoplastic modeling, I find there are two parametesr(p_t(2), bulk_w(15)) without any definitions. Could someone kindly explain the exact meaning for […]
Hypoplastic rate independent and non-linearity
sobhan abedinnejad||Constitutive Modelling|2 |
Views 3,935
Dear all I’m studying hypo-plastic constitutive law from beginning concepts I traced concepts successfully until i faced **rate independent topic** i read this topic in the prof. Wolfgangs paper (hypo-plasticity […]
Question on the Matlab driver – model hypo Cam Clay
Hengyi Kang||Constitutive Modelling|2 |
Views 4,010
As a beginner to soil constitutive modelling, I am learning the hypoplastic models by reading the matlab drivers. I am confused with the matlab file f_hyp.m in the model hypo_camclay. […]
abaqus version
sobhan abedinnejad||Constitutive Modelling|3 |
Views 3,991
hi every one i’m using abaqus 2017 and i want to implement Hypo-sand to my Biaxial model (2D) and before all, i linked abaqus and fortran successfully my question is […]
fortran format
sobhan abedinnejad||Finite Elements|1 |
Views 3,390
hi, every one i have problem with fortran format my abaqus is 6.14 and this version accept (.for) format for fortran but some subroutines are in (.f ) format is […]
Sand Hypoplasticity calibration
Francisco Mendez||Constitutive Modelling|1 |
Views 3,980
Good evening, everyone. I find it difficult to apply equations (13) and (14) of Herle’s publication “Determination of parameters of a hypoplastic constitutive model from properties of grain assemblies”. As […]
Consideration of Ko using HP clay model
muhammad shakeel||Finite Elements|1 |
Views 3,465
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 […]
testing an User Defined Soil Model in plaxis
MIGUEL VALENCIA GALINDO||Constitutive Modelling|2 |
Views 4,800
Hi everyone I am writing a code for a model in the UDSM format for Plaxis. I already have the “*.dll” files, but when I run the soil test I […]
Undrained Tests with Clay Hypoplasticity Intergranular
Hashmi Sohawon||Constitutive Modelling|2 |
Views 4,151
Hi all, I wanted to share these results to show that the use of the hypo clay model does in fact give more realistic undrained stress paths for clays on […]
Consolidation analysis using HP clay model in Plaxis
muhammad shakeel||Finite Elements|1 |
Views 3,976
Dear Prof David / SOil model community, I am performing coupled consolidation analysis for deep excavation in clay using HP clay model in Plaxis 3D. Performing the undrained analysis, the […]
Undrained Tests with Basic Clay Hypoplasticity
Hashmi Sohawon||Constitutive Modelling|6 |
Views 4,346
Hi Prof. David, I have obtained these results in that attached picture using Triax and got confused when seeing that an isotopically normally consolidated sample does not follow a trend […]
VUMAT ABAQUS: sandy soil
hoang thai an||Constitutive Modelling|2 |
Views 4,612
Dear PhD, I am studying roller vibrations on sandy soil models with vumat. Can PhD give me the subroutine model and input parameters of objects for reference? Unit of the […]
General Questions Hypoplastic Umat on Abaqus
Hashmi Sohawon||Constitutive Modelling|11 |
Views 4,447
Hi all, After successfully testing a linear elastic Umat on Abaqus, I am now trying to test the Hypoplastic model Umat. I intend to carry out a drained triaxial single […]
Non-local regularization: Need VUMAT of Mohr-Coulomb model in abaqus
Kunal Sanjay Pardikar||Constitutive Modelling|1 |
Views 4,594
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 […]
Search SoilModels Website
Recent posts
- Degradation ( disturbance ) of hypoplastic clay 23.4.2024
- Degradation ( disturbance ) of hypoplastic clay 23.4.2024
- 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
Recent Comments