Hardcopies of my new book “Modelling of Soil Behaviour with Hypoplasticity – Another Approach to Soil Constitutive Modelling” just arrived. The book is available for hardcover or pdf orders at https://www.springer.com/us/book/9783030039752
SoilModels Forum
Tochnog Professional Page moves

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Hi All, Starting from Saturday January 26 2019 the Tochnog Professional page moves to http://www.tochnogprofessional.nl Best, Dennis Roddeman
Plaxis 3D Tunnel

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Hi Everybody, I would like to ask an error problem where I am getting while using Plaxis 3D tunnel V 1.2. Previously I was using the software with Windows 7 […]
Dear all, I’m using the UMAT file in which the hypoplastic model for thermal cycles is implemented. I have done some runs for an axisymmetrical model for a single energy […]
Dear all, I’m using the UMAT file in which the hypoplastic model for thermal cycles is implemented. In the Abaqus input file I have added the two lines necessary to […]
Hypoplastic model for Granular soil

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Hello everyone, Could you please anyone tell me that how I can define the hypoplastic constitutive model for granular soil in ABAQUS 6.13. With Regards, Naveen.
Calibration Sand Hypoplasticity whit ExCalibre

Views 4,631
Dear all I have some laboratory test of Pescara sand and I’m trying to find the von Wolffersdorff parameters of this sand. So I have used ExCalibre with the data […]
New book “Modelling of Soil Behaviour of Hypoplasticity”

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I have just returned to Springer proofs of my new book “Modelling of Soil Behaviour of Hypoplasticity – Another Approach to Soil Constitutive Modelling“. It will probably still take few […]
multi yield surface model

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Hi everyone, i am trying to write umat subroutine for multi yield surface plasticity model.if its possible give me some information to do my project better and if some body […]
ExCalibre – Definiton of q

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Hello, I am performing calibration trials for the hypoplastic sand model with the aid of ExCalibre and i was wondering how the deviatoric stresses q for the triaxial test input […]
ALERT Geomaterials – SoilModels support declaration

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ALERT Geomaterials (The Alliance of Laboratories in Europe for Education, Research and Technology) is a European organisation including 33 Universities or Organisations, which are most active in the field of numerical […]
Constitutive Model for clayey sand Soils Considering the Effect of Intergranular Physicochemical Forces

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Hi all, I’m doing some experimental work to investigate the salinity effect on clayey sand behaviour. Is there any constitutive model considering the physicochemical forces for such materials? Regards, Mehdi
14th International Conference Underground Construction Prague 2019

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The ITA-AITES Czech Tunnelling Association cordially invites you to 14th International Conference entitled “Underground Construction Prague 2019”, which will be held in Prague, the capital of the Czech Republic, June […]
Difficulties in calibration of triaxial test on Hochstetten sand by sand Hypoplasticity model

Views 4,888
“A hypoplastic relation for granular materials with a predefined limit state surface” paper by P. A. Von Wolffersdorff April 1996 include a triaxial test result of sample 10cm diameter and […]
Interface to study soil-structure interaction in Plaxis 3D (Clay Hypoplasticity)

Views 7,733
Hello, I am trying to simulate the behavior of helical anchors (also called screw anchors) using PLAXIS 3D and a clay hypoplasticity constitutive model. The helical anchor shaft is simulated […]
The 2014 Masin hypoplasticity for clays has been implemented in Tochnog Professional under guidance of Dr. David Masin. This implementation includes structure, intergranular strains and visco effects. Extensions to the […]
Website editing capability for SoilModels members! SoilModels members can now edit website content associated with their accounts. While this change will be hardly noticeble to website visitors at the first […]
Messaging system launched at SoilModels

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Messaging system has just been launched at SoilModels, so that SoilModels Members cant contact each other without a need for the system to reveal email addresses (they are never revealed). […]
An authorship of SoilModels database items has been updated so that real contributors are now indicated as authors, not the SoilModels admin. This gives more credit to our contributors. We […]
Greetings i used interface Vumat with Umat for simulating CEL problem, after 50% of analysis, i got the error as “Excessive incremental rotation of the elements in element set ” […]
SoilModels Publication Database including Mohr (1900) paper defining Mohr-Coulomb model

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Publication Database has just been launched at SoilModels. Its aim is to collect papers, theses or presentations associated with constitutive models available in Constitutive Model Database. These papers will also […]
MatLab m.file

Views 5,947
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 […]
The constitutive models PM4Sand (Boulanger and Ziotopoulou 2017) and PM4Silt (Boulanger and Ziotopoulou 2018) for plane-strain earthquake engineering applications for sands, and clays and low-plasticity silts respectively are now available […]
UMAT in Geotechnics
Views 5,056
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 […]
Hello, I read the research report and the FORTRAN code available at https://soilmodels.com/download/vumat_umatinterface-zip/. It sounds quite interesting but I have a couple of questions about the FORTRAN code: 1- Did […]
Oedometer test simulation with “Sand Hypoplasticity Model” in Plaxis

Views 4,884
Hi, I just came across some problems with the implementation of the “Sand Hypoplasticity Model” in Plaxis. I wanted to to perform a simulation of an oedometer test on a […]
PM4SAND model

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Hi all, I have been trying to code the PM4SAND model for several months, but I faced some problems. I was wondering if there is anyone who worked with this […]
SANISAND dll

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Hi there, I’ve used successfully used SANISAND .dll with Plaxis 2016, but after switching to 2017 and now 2018 the .dll seems not to work (the parameter fields appear without […]
Automatic calibration software ExCalibre has been launched

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On behalf of the team of developers I am happy to announce that, after more than four years of development and testing, ExCalibre has just been launched. ExCalibre is a […]
Regarding FRIC : As a beginner

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Sir, As a beginner of FRIC I am facing some difficulties to implement it. The downloaded FRIC code has been added to my pile soil friction model and trying to […]
How to replicate results for vertical cut in FEM program

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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 […]
Compile triax calibration software under windows

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1. Download install exe (32 or 64 bit) from https://cygwin.com/install.html 2. Choose a mirror site / click Next and select all packages you need for compiling: Type: “gcc” into search […]
A PhD-level course on hypoplastic constitutive modelling intended for both academia and practitioners.
Hypoplastic Interface Model: Virtual Shear Zone Thickness and Surface Rougness Coefficient

Views 4,760
Hello, I want to use Hypoplastic Interface (Fric Subroutine) in my ABAQUS contact models. However, I don’t know how I can determine Virtual Shear Zone Thickness. It is the Parameter […]
Multilaminate model – new model at SoilModels

Views 2,029
Multilaminate model (Schädlich, Schweiger and coworkers) is now available for download as Plaxis UsrMod. Thanks to Helmut Schweiger and coworkers from Graz University of Technology, Institute of Soil Mechanics, Foundation Engineering and Computational […]
Hypoplasticity (sand and clay models) is now available for GeoSlope SIGMA/W finite element code in a form of user defined Add-In. The implementation is based on ABAQUS umats and it […]
Velacs Project Data

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Dear colleagues, I want to ask your help — does anyone know where we can find all the test data from the old Velacs Project? If so, that would be […]
Error: permission to access files denied (Hypoplasticity in PLAXIS)

Views 7,934
Hello, I am trying to implement the dll for hypoplasticity in Plaxis 3D. It runs through both the Initial Phase and a Nil Step. However, when it calculates about 20 […]
Triaxial Callibration test with Hypoplasticity

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Dear all I am trying to calibrate the HP for sand, and I have quite comprehensive data. but they are not totally consistent with each other . we have the […]
Calibration of Hypoplastic material model parameters

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I would like to derive material parameters based for a simulation which will implement the hypoplastic material model based on the following information: • Heavily overconsolidated • Very dense, fine […]
Original Announcement of the soilmodels.info project in 2007

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Did you know about history of SoilModels? Here you can download the original announcement, written during September 2007 meeting of ALERT association in Aussois, France and published in the International Journal […]
SoilModels News – Barodesy, Incremental Driver update, post views count and ExCalibre input files

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Number of interesting news at SoilModels from past week: New Barodesy constitutive model, umat with source code and Plaxis DLL. Thanks to the researchers from the University of Innsbruck (Barbara […]
Hypoplastcity sand model

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Not able to run the subroutine ……..error is coming ……UMAT: illegal (negative) actual void ratio detected Can anybody help
Geotechnical software and constitutive model database has just been launched at SoilModels. With this new functionality, users can select a constitutive model and they will directly see in which finite […]
Upated version of SANISAND umat including Plaxis interface

Views 2,809
New version of SANISAND umat, including interface for Plaxis, is now available in Download section (https://soilmodels.com/sanisand/). Original implementation has been developed by M. Martinelli, C. Miriano and C. Tamagnini in 2013. This […]
Subroutine of SANISAND model

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I am trying use sanisand subroutine posted in this website. But it is not working. Getting no values for field variable in the odb. I think i am missing something. […]
Download sharing at SoilModels

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If you want to share some material for download at SoilModels with the others such as the presentations in this post: Presentations on hypoplasticity applications, D. Mašín, NGI 2017 please […]
Presentations on hypoplasticity applications, D. Mašín, NGI 2017

Views 6,454
Based on some requests, I share here two presentations on hypoplasticity applications. One is related to simulation of various boundary value problems, the other focuses on simulation of cyclic and […]
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Recent posts
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Drucker-Prager Cap 29.5.2025
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Abaqus RITSS with hypoplastic 9.4.2025
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Fellin UMAT subroutine 2.4.2025
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Hypoplasticity clay for triaxial compression in abaqus 26.3.2025
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Abaqus RITSS methon for LDFE analysis with hypoplastic 17.3.2025
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Request for VUMAT Implementation of Mohr-Coulomb, Drucker-Prager, or Drucker-Prager Cap 28.2.2025
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Suggestions for an Advanced Constitutive Model in FEM-Based Dynamic Slope Stability Analysis 12.2.2025
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Hardening Soil or Hardening Soil-Small umat in Abaqus 2.1.2025
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hypoplastic interface 11.12.2024
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Triaxial Test Driver SANISAND 30.10.2024
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REQUEST FOR EXPRESSIONS OF INTEREST (REOI) FOR PROJECT IN CONSTITUTIVE MODELLING 23.10.2024
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Programme of the ALERT Olek Zienkiewicz school on Constitutive Modelling of Geomaterials, February 3 to 7, 2025, Prague, Czech Republic 11.10.2024
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