Dear all, I am a PhD student in Hohai University. Recently I have been trying to simulate a triaxial compression test using the hypoplasticity model for clay. The UMAT subroutine […]
SoilModels Forum
UMAT Code for Modified Cam Clay model

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I am trying to develop UMAT code for MCC, but facing difficulty. Is there any such files available which can help me to speed up. please refer. Thank you.
Mohr Coulomb umat in Abaqus

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Dear all, does anyone have the umat code for Mohr Coulomb in Abaqus? For my current work I need a umat for Mohr Coulomb in Abaqus. It would be highly […]
ABAQUS-UMAT Help

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Hi everyone, I would like to ask if anyone has an example umat file for me to study to work on my master thesis researches. I would like to create […]
SANISAND umat issue

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Hello everyone; I have implemented the Sanisand constitutive model (UMAT) in abaqus in the scope of performing a dynamic analysis on a 3D soil-pile interaction problem. I have succeded in […]
SANISAND pile-soil-interaction ABAQUS

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Hi everyone: I am trying to use SANISAND as the constitutive model of soil, and use ABAQUS software to simulate pile-soil interaction. Is it better to choose “Static, Genaral” analysis […]
Abaqus user defined field

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Hi, I am going to use the usdfld to function the density of sand changing due to confining pressure. I am not sure Abaqus will call the usdfld for every […]
Hardening parameters (yield stress & absolute plastic strain)

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Hi to everyone I want to model a Sand with Cap plasticity or Drucker Prager failure criterion in ABAQUS, and I have the result of Triaxial test (I’ve attached the […]
Errors of sand hypoplastic model with Abaqus Vumat

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Dear all, Recently, I have been working on the simulation of a pile-soil interaction with CEL method in Abaqus/Explicit. I simulate the sand with the Sand Hypoplasticity Model provided by […]
Barodesy download package including small strain stiffness and strength reduction (UMAT and PLAXIS dll)

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A new download package for Clay Barodesy is available in the download section (https://soilmodels.com/barodesy/) The model uses the basic model of barodesy for clay (Medicus G. and Fellin W. 2017) […]
Dear all, After carefully reading the matlab drivers of hypoplastic models, I was wondering why there is not mix control undrained TX compression. I want to achieve the same result […]
Hypoplastic Interface Model: Does anybody implemented this model in FLAC3D

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I want to use this model to simulate soil-structure interaction in FLAC3D software, so I was wondering does anybody implemented this model in FLAC3D, and could you please share your […]
Question on implementation of sand hypoplastic model with Abaqus umat

Views 3,546
Dear all, I am a PhD student in China University of geosciences. Recently, I have been working on the simulation of a pile-soil interaction with Abaqus. I simulate the sand […]
General questions on implementation of sand hypoplasticity model with Abaqus umat

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Dear all, I am a PhD student in Zhejiang University. Recently, I have been working on the simulation of a braced excavation with Abaqus. I want to simulate the soil […]
SANISAND 2008 model

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Dear fellow, Anyone have SANISAND 2008 by Taiebat and Dafalias umat subroutine available for Abaqus. I have 2004 but I need 2008 one.
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_sand. […]
Dear all, I am currently writing a proposal for a (small & hopefully nice) eLearning project: Within the project, I would like to create animations related to constitutive modelling. I […]
PM4Silt software

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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.
Factor of safety in Plaxis 3D using hypoplastic model for sand

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I am currently modelling a test conducted in the geotechnical centrifuge facility at HKUST. The test consisted of a sand slope with a rising water table. The slope height in […]
Post-doc position in energy geotechnics at Aarhus University

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Applications are welcome for a 1.5-year postdoc position (with extension opportunities) to investigate the cyclic behaviour of a geomembrane energy storage system. The successful candidate will investigate the cyclic behaviour […]
Hi all! I am modelling some triaxial compressions in ABAQUS with Weald Clay. The constitutive law i am using is the clay hypoplasticity by Mašín. When running the program using […]
Slope stability calculation with hypoplasticity using phi-c reduction available now in download section

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The strength reduction method in clay hypoplasticity now available
SANICLAY-B (2018) how to calculate Dep
Views 3,402
Dear fellows, I have been working on coding SANICLAY-B model (2018) . Now I have one question in terms of this model. But I am stuck now. I have two […]
ABAQUS modeling: Warning about unconnected regions when using hypoplasticity subroutine

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I ran a simple 3D model with symmetry boundary conditions first using elastic material and then as hypoplastic using a subroutine. However, in the former case, I don’t get the […]
Calibration of the von Wolffersdorff model using Genetic Algorithms

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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 […]
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

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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

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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

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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

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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

Views 2,392
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

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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

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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!

Views 2,488
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

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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)

Views 1,142
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

Views 944
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

Views 3,728
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

Views 4,268
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

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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

Views 3,532
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

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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

Views 3,202
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

Views 3,892
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

Views 3,367
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

Views 2,391
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 […]
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Recent posts
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FE formulation and software 25.3.2023
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Multi-objective analysis of the Sand Hypoplasticity model calibration 24.3.2023
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Problem with SANISAND UMAT 7.3.2023
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Prague Geotechnical Days 2023 (22nd – 23rd of May) with Prague Geotechnical Lecture by prof. Yannis Dafalias 28.2.2023
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What is an appropriate damping model for dynamic liquefaction analysis of tailings storage facility in FLAC? 10.2.2023
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Abaqus vs Plaxis – Local Convergence Tolerances 2.2.2023
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Zbraslav sand – Cyclic tests by Charles University 17.1.2023
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New features in Excalibre 17.1.2023
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Sanisand 13.1.2023
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SaniSand Model in Plaxis 3D 9.12.2022
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The GA-cal software for the automatic calibration of soil constitutive laws 2.12.2022
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Abaqus OneAPI Compiler 10.11.2022
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