Hi all, Prague Geotechnical Days 2023 were indeed a successfull event. We are happy to let you know that selected presentations are now awailable in SoilModels publication database. In particular, […]
SoilModels Forum
Problem in using Hypoplastic model for sand in Abaqus.

Views 787
Hello, I am using the UMAT code for sand hypoplasticity provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/. I am simulating Axisymmetric condition in Abaqus. To check the results given by the […]
An error in the SANISAND umat runtime

Views 1,109
Dear all I was simulating a pile in a fully drained soil subjected to horizontal loads using ABAQUS (as shown in Figure 1) and noticed from the monitor that the […]
Htypoplastic Model in Miidas GTS NX

Views 1,468
Hello.. I am defining the hypoplastic parameters for Karlsruhe sand (found in a paper) using MIDAS GTS NX. In the software the a requesting (in addition of parameters) the number […]
set cavitation limit in ABAQUS/STANDARD when using SANISAND umat

Views 2,441
Dear all I am recently working on the mechanical characteristics of large diameter monopiles under horizontal loads.The numerical simulation part of this project was carried out in ABAQUS/STANDARD and for […]
FE formulation and software

Views 1,107
Hi, I am looking for advice on FE formulation and software. I am a recent graduate of MSc Geotechnical Engineering and am looking to do freelance work or possibly undertake […]
Multi-objective analysis of the Sand Hypoplasticity model calibration

Views 260
I am happy to announce that our pre-print paper, “Multi-objective analysis of the Sand Hypoplasticity model calibration”, is available on researchgate (https://www.researchgate.net/publication/369199567_Multi-objective_analysis_of_the_Sand_Hypoplasticity_model_calibration) and Axive (https://doi.org/10.48550/arXiv.2303.07234). In this work, we study […]
Problem with SANISAND UMAT

Views 8,463
Hello all, I’m using the SANISAND UMAT I downloaded here for my research, the problem I found is it gives me wrong results in ABAQUS and INCREMENTAL DRIVER for element […]
Prague Geotechnical Days 2023 (22nd – 23rd of May) with Prague Geotechnical Lecture by prof. Yannis Dafalias

Views 3,354
The 29th Prague Geotechnical Days international conference focused on issue of Cyclic Loading of Geotechnical Structures will be held on May 22–23, 2023 Registration: free for students, 80 EUR otherwise […]
What is an appropriate damping model for dynamic liquefaction analysis of tailings storage facility in FLAC?

Views 6,669
Has anyone had success simulating earthquake loading / dynamic liquefaction in a full-scale, plane-strain model of a TSF in FLAC2D/FLAC3D? The topic of damping is complex and the choice of […]
Abaqus vs Plaxis – Local Convergence Tolerances

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Hi, I have a question regarding local, material-level convergence tolerances in FE software, particularly Abaqus and Plaxis. I have experience using Abaqus but not much familiar with Plaxis. As shown […]
New features in Excalibre

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Hi all, We are happy to announce that the Excalibre team received support from the research grant GACR 22-12178S to further develop the calibration software, which is freely available at […]
Sanisand

Views 2,662
Hello, I am simulating soil and pile using Sanisand on Abaqus. I have problems with the analysis because of the value of the parameter 18. When I use small values, […]
SaniSand Model in Plaxis 3D

Views 15,957
Hello.. I am using SaniSand constitutive model, for the simulation of the behavior of onshore wind turbine using plaxis 3d. The dll file published in the website request the determination […]
The GA-cal software for the automatic calibration of soil constitutive laws

Views 5,489
I am happy to announce that our pre-print paper, “The GA-cal software for the automatic calibration of soil constitutive laws: a tutorial and a user manual”, is available on researchgate […]
Abaqus OneAPI Compiler

Views 7,259
Hello.. I am testing SaniSand constitutive model as published by Mr. Masin at this site. The Abaqus is V21 and the visual studio 2017 with OneAPI compiler, the Abaqus verification […]
Few more Question on calculating lateral displacement of pile using hypoplastic clay model

Views 3,407
Dear Professor David, Thank you very much for your previous clarification. its really helps. In continuation to my previous , there are few more question, i want your kindself to […]
Hello, I am writting to ask how to get the elastic modulus or undrained strength of the soil in the simulation model by using hypoplastic model in clay? Is there […]
Problem in calculating Lateral displacement of the pile using Hypoplastic clay model

Views 2,806
Hy Professor David, I am trying to verify the result of one of your paper by the title ‘Cyclic lateral response and failure mechanisms of semi-rigid pile in soft clay: […]
Special issue of Computers and Structures “Numerical simulation of multi‐physics phenomena in geotechnical structures”

Views 5,083
https://www.sciencedirect.com/journal/computers-and-structures/about/forthcoming-special-issues Numerical simulation of multi‐physics phenomena in geotechnical structures Complete and thorough analysis of geotechnical structures, requires various complex materials models with internal structures, which cannot be described by the […]
Post-doctorate position at Nantes University (France) in geotechnical analysis of mutualized anchors

Views 1,305
Dear colleagues, France Energies Marines is conducting, together with other partners (Nantes Université, EDF, WPD, TotalEnergies, Technip Energies, Université Grenoble Alpes, Innosea, Eolfi, Saipem, Université Gustave Eiffel), the MUTANC project. […]
Hi, I’m facing a problem with my model. I’m trying to simulate a helical pile in soil. When I create the job, my job doesn’t make any increment and the […]
Hi altruists, Hope all of you are doing well. I am looking for literature on the NorSand model, which considers the drained cyclic triaxial testing behavior. I have found a […]
Post-doc position at Charles University in the field of THM analysis of unsaturated and heated soil cyclic loading

Views 1,824
International Postdoctoral Fellowship – Earth and Environmental Sciences Topic: In many geotechnical problems either saturated or unsaturated soils are subjected to a cyclic coupled thermo-hydro-mechanical (THM) loading. A prominent example […]
Shear modulus degragation

Views 3,959
Hello all, I am using the clay hypoplsticity model in Abaqus. As shown in the picture, I have to construct the stiffness desegregation curve to calibrate the R value. Can […]
FRIC code for clay hypoplasticity interface

Views 4,113
Dear Prof Stutz and Prof Mašín, Is FRIC code for clay hypoplasticity available? If yes, could you please provide me with the link to download FRIC? Thank you Haran
Using pore fluid-stress element in SandSand

Views 2,964
Hello everyone, Is it possible to use pore fluid- stress element in abaqus standard when soil is modeled using SANISAND constitutive model ? (UMAT)
“Warning LNK4210” – hypoplastic clay UMAT

Views 2,899
Hello Everyone, I am using the UMAT code for clay hypoplasticity provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/ I made a test model in Abaqus2020 and applied the umat code (umat_hcea.for). […]
Prague Geotechnical Days 2022 with Prague Geotechnical Lecture by prof. Cino Viggiani

Views 2,851
Everyone is cordially invited to attend Prague Geotechnical Days 2022, scheduled for May 23-24, which include Prague Geotechnical Lecture by prof. Cino Viggiani entitled “Recent Developments in Laboratory Testing of […]
Micropiles load tests database

Views 3,218
Hello, This Abou Alhaija Majd, Ph.D. student at Technical University of Civil Engineering Bucharest, i am looking for Micropiles load test data to be used for calibration in my study, […]
DIANA 10.5 new features

Views 3,667
DIANA 10.5 was released in 2021. It features many powerful capabilities to model soil-structure interection. See more in https://dianafea.com/2021-DIANA10-5-Release
Input files for element tests for hypoplastic clay/sand UMAT
Views 3,057
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 […]
Combining Hypoplastic-sand and Hypoplastic-clay in one UMAT file

Views 3,125
Hi everyone, i have combined both Hypoplastic sand and clay umats in one umat ( to use for example in the case of multilayered soil medium made of clay and […]
UMAT code for Unsaturated soil modes

Views 3,526
Hello Everyone, I am trying to implement an unsaturated soil model (BBM or similar) in ABAQUS using UMAT. We want to assign a pore-pressure boundary condition for simulating the drying […]
I have a UMAT of Mohr Coulomb with no hardening, where i have to define SSE (specific strain energy) and SPD (specific plastic dissipation). Any idea?
Papers on Excalibre

Views 3,820
Hi all, Details of Excalibre software (https://soilmodels.com/excalibre) functionality and calibration procedure have been published in two papers, which are now available online at the webpages of publisher (https://link.springer.com/article/10.1007%2Fs11440-021-01441-0 and https://link.springer.com/article/10.1007%2Fs11440-021-01435-y). […]
Abaqus UEL Hypoplasticity

Views 4,543
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 […]
Three PhD positions in soil mechanics at Charles University, Czech Republic

Views 1,162
The Soil Mechanics group led by David Mašín at Charles University, Prague, Czech Republic, is seeking three motivated PhD students with experience in modelling and/or experiments to work on the […]
Hypoplastic UMAT & Void Ratio

Views 4,934
Hi all, Can anyone give a clarification on the material property (parameter 22) in the hypopplasticity umat for clay on Abaqus. My understanding is that these parameters are defined as […]
Hi everyone, i want to carry out some transient dynamic analysis. as far as I know, dynamic steps in abaqus does not allow for pore pressure build-up and dissipation, and […]
Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working

Views 3,847
I am trying to reproduce a TX monotonic, compressive test on a sand by using a 1-element, axisymmetric ABAQUS FE model, assigned to a SANISAND material. For this purpose, I […]
Vibration foundation behavior

Views 4,096
Dear all I have FEM analysis results for vibration foundation response that rested either on saturated salt-encrusted flat soil (case-1) or on finite cemented sand overlie saturated salt-encrusted flat soil […]
Getting started with UMAT for Hypoplastic clay model in ABAQUS

Views 3,576
Hello All, I am getting started with implementing UMAT for soil model in ABAQUS. I am planning to use Hypoplastic clay constitutive soil model to simulate the triaxial tests. I […]
consistent tangent stiffness calculation in hypoplasticity sand UMAT

Views 3,954
Dear all, Thanks for hypoplasticity sand UMAT provided by Prof. Masin. During studying hypo sand UMAT, I am encountered with a question about consistent tangent stiffness calculation. subroutine ”perturbate_h“ seems […]
Dear forumers: Thanks to hypoplasticity sand UMAT provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/. But during studying above sand UMAT, I found that the stress order may be incorrect. Because stress […]
ALERT doctoral school on constitutive modelling – hands on session triax input files

Views 3,730
ALERT doctoral school on constitutive modelling is happening right now. The school lecture notes are available at the website of ALERT geomaterials (http://alertgeomaterials.eu/publications/) Below you find triax input files for […]
Initial Stiffness of CU test in Masin’s 2014 Model

Views 3,410
Hi, I am using Hypoplasticity model with explicit asymptotic boundary surface proposed by Prof. Masin in 2014. In this model, parameter ‘nu’ controls initial stiffness in CU test. But when […]
CONSTUTUTIVE MODELLING

Views 3,824
Can SANISAND version given in soil model work well for cyclic simple shear test ?
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Recent posts
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Presentations from Prague Geotechnical Days 2023 including 29th Prague Geotechical Lecture by Yannis Dafalias 25.5.2023
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Problem in using Hypoplastic model for sand in Abaqus. 17.5.2023
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An error in the SANISAND umat runtime 8.5.2023
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Htypoplastic Model in Miidas GTS NX 25.4.2023
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set cavitation limit in ABAQUS/STANDARD when using SANISAND umat 2.4.2023
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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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