I am modelling an underground cavern for Compressed Air Energy Storage applications using Abaqus. To begin, I attempted to replicate the results presented in the provided paper: Damasceno, DR, Spross, […]
SoilModels Forum
Dear all, I need to use ABAQUS to analyze the liquefaction of saturated soil under explosive load. How should I simulate this process? Currently I need the pore water pressure […]
Hardening soil Model UMAT

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I have the hardening soil model in the UMAT format. However, when I run the code, it gives me this error as shown in the picture. I tried to make […]
Problem with VUMAT interface

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Dear All, I am trying to run the VUMAT interface by Prof. Binen with the Sand Hypoplasticity. However, when I run the simulation Abaqus returns the following error: “Problem during […]
Dear all, A while ago, a person asked about the hypoplasticity umats, the problem was that the umats were not working when compiled using the oneAPI fortran compiler, an error […]
Oedometric Test Soil Test Plaxis

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Hi community, I am trying to simulate a oedometer test in soil test of plaxis but i am not reaching the expected results. In the Bentley manual available at the […]
Problem in simulating CPT using SANISAND04

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I have a question regarding the simulation of cone penetration tests using the SANISAND04 model. I have observed that the parameter m (yield surface size)has a significant impact on the […]
Example of FLAC3D data file

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Hello.. I am new in FLAC3D, could some send to me an example of data file code for pile soil interaction with seismic loads ? I will be thankful
sigini ans sdvini subroutine example for soil model in Abaqus

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Dear all, I’m looking for a sigini and sdvini subroutine examples to calculate soil initial state with rest coeficient K0 method or ICP-05 method or any method available. thank you. […]
Presentations from Prague Geotechnical Days 2023 including 29th Prague Geotechical Lecture by Yannis Dafalias

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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, […]
Problem in using Hypoplastic model for sand in Abaqus.

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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

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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

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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

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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

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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

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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

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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

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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?

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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

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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

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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

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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 7,696
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 3,812
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 3,259
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”

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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

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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

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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

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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

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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

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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 3,440
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 3,196
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

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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

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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 3,562
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

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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 4,008
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 4,334
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

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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

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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 5,440
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 […]
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BCV bentonite experimental and modelling datasets 14.11.2023
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Hardening soil Model UMAT 13.9.2023
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Problem with UMAT for clay hypoplasticity. Program exiting. 30.6.2023
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Example of FLAC3D data file 10.6.2023
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sigini ans sdvini subroutine example for soil model in Abaqus 6.6.2023
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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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