“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 […]
SoilModels Forum
Interface to study soil-structure interaction in Plaxis 3D (Clay Hypoplasticity)

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3,269
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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3,148
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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506
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

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2,106
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
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1,469
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

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1,468
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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1,247
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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1,171
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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1,461
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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1,199
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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973
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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1,333
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

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1,334
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 (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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1,153
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)

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2,532
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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1,163
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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1,530
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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152
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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263
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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1,480
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

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844
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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2,019
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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406
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

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2,531
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 […]
Tochnog Professional 100 element free version, www.tochnogprofessional.nl

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999
The Tochnog Professional finite element program is now available as free version with 100 elements. It can be downloaded without registration from http://www.tochnogprofessional.nl. Several commercial and free pre- and postprocessors […]
The ALERT Olek Zienkiewicz Winterschool 2018 on Natural versus compacted clayey soils: from micro to macro behaviour and modelling will be held from 5th to 9th of November 2018 in […]
Triax element test driver

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390
A new element test driver named “Triax” has been included into the list of calibration software available at https://soilmodels.com/triax including source code and pre-compiled Windows and Linux executables. I have been using […]
Calculation of coordinates of climbing formwork using hypoplasticity and pressuremter tests

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898
Our article published in the latest issue of Ground Engineering 10/2017. Great combination of cone-pressueremeter-testing (CPM) by FUGRO and advanced 3D Fem modelling by GEOLINK using hypoplastic constitutive equations to […]
SoilModels presentation and logo

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87
At the following link, you may find a short presentation on SoilModels from the ICSMGE conference in Seoul, Korea, September 2017. Please feel free to distribute the presentation among your […]
Two new umats are available now at SoilModels, thanks to Wolfgang Felling of the University of Innsbruck. These umats use different integration scheme compared with the other sand hypoplastic umats. […]
Dear collagues and friends, SoilModels has been around for 10 years now. Though we found the project succesfull in disseminating advanced material models in geotechnical engineering, we still see it […]
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