SoilModels Forum

Challenges in simulating geomechanical models using Mohr-Coulomb with Tension Cut-Off in Abaqus

Chee Min Leong|20.10.2023|Constitutive Modelling|1 |

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, […]

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Analys soil liquefaction with Abaqus under blast load

Alex Liu|19.10.2023|Finite Elements|0 |

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 […]

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Hardening soil Model UMAT

isma khabis|13.9.2023|Constitutive Modelling|2 |

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 […]

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Problem with VUMAT interface

Giada Orlando|20.8.2023|Constitutive Modelling|0 |

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 […]

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UMAT and oneAPI compiler issues. (SOLVED…i hope :p)

anis kheffache|5.8.2023|Finite Elements|7 |

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 […]

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Oedometric Test Soil Test Plaxis

Ana Ribera|21.7.2023|Constitutive Modelling|0 |

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 […]

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Problem in simulating CPT using SANISAND04

an zhanng|10.7.2023|Finite Elements|5 |

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 […]

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Problem with UMAT for clay hypoplasticity. Program exiting.

Ashesh Choudhury|30.6.2023|Constitutive Modelling|0 |

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Example of FLAC3D data file

Kassem Dib|10.6.2023|Finite Elements|0 |

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

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sigini ans sdvini subroutine example for soil model in Abaqus

Safia EDAOUDI|6.6.2023|Finite Elements|0 |

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. […]

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Presentations from Prague Geotechnical Days 2023 including 29th Prague Geotechical Lecture by Yannis Dafalias

David Mašín|25.5.2023|Event Announcements|1 |

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, […]

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Problem in using Hypoplastic model for sand in Abaqus.

isma khabis|17.5.2023|Constitutive Modelling|16 |

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 […]

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An error in the SANISAND umat runtime

Zhentao Liu|8.5.2023|Finite Elements|15 |

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 […]

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Htypoplastic Model in Miidas GTS NX

Kassem Dib|25.4.2023|Constitutive Modelling|6 |

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 […]

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set cavitation limit in ABAQUS/STANDARD when using SANISAND umat

Zhentao Liu|2.4.2023|Finite Elements|6 |

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 […]

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FE formulation and software

Mark G|25.3.2023|Finite Elements|0 |

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 […]

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Multi-objective analysis of the Sand Hypoplasticity model calibration

Francisco Mendez|24.3.2023|Constitutive Modelling|0 |

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 […]

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Problem with SANISAND UMAT

Safia EDAOUDI|7.3.2023|Constitutive Modelling|3 |

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 […]

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Prague Geotechnical Days 2023 (22nd – 23rd of May) with Prague Geotechnical Lecture by prof. Yannis Dafalias

David Mašín|28.2.2023|Event Announcements|1 |

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 […]

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What is an appropriate damping model for dynamic liquefaction analysis of tailings storage facility in FLAC?

Paul le Roux|10.2.2023|Constitutive Modelling|0 |

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 […]

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Abaqus vs Plaxis – Local Convergence Tolerances

Sina Azad|2.2.2023|Finite Elements|1 |

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 […]

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New features in Excalibre

David Mašín|17.1.2023|Constitutive Modelling|0 |

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 […]

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Sanisand

Norma Harb|13.1.2023|Constitutive Modelling|1 |

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, […]

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SaniSand Model in Plaxis 3D

Kassem Dib|9.12.2022|Constitutive Modelling|1 |

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 […]

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The GA-cal software for the automatic calibration of soil constitutive laws

Francisco Mendez|2.12.2022|Constitutive Modelling|2 |

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 […]

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Abaqus OneAPI Compiler

Kassem Dib|10.11.2022|Finite Elements|1 |

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 […]

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Few more Question on calculating lateral displacement of pile using hypoplastic clay model

Muhammad Ahmad|3.10.2022|Finite Elements|0 |

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 […]

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A question about the hypoplastic model in clay

Wenbo Gu|22.9.2022|Constitutive Modelling|7 |

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 […]

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Problem in calculating Lateral displacement of the pile using Hypoplastic clay model

arsalan Ahmad|2.9.2022|Finite Elements|4 |

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: […]

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Special issue of Computers and Structures “Numerical simulation of multi‐physics phenomena in geotechnical structures”

David Mašín|25.7.2022|Finite Elements|1 |

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 […]

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Post-doctorate position at Nantes University (France) in geotechnical analysis of mutualized anchors

Abdul-Hamid Soubra|6.7.2022|Position Announcements|0 |

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. […]

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ABAQUS job doesn’t make any increment

Abdullah Al-Rawabdeh|22.6.2022|Finite Elements|0 |

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 […]

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NorSand model for cyclic triaxial testing

A S M RIYAD|9.6.2022|Constitutive Modelling|1 |

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 […]

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Post-doc position at Charles University in the field of THM analysis of unsaturated and heated soil cyclic loading

David Mašín|30.5.2022|Position Announcements|0 |

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 […]

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Shear modulus degragation

Baban Bapir|12.5.2022|Constitutive Modelling|1 |

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 […]

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FRIC code for clay hypoplasticity interface

Haran Gananathan|23.4.2022|Constitutive Modelling|0 |

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

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Using pore fluid-stress element in SandSand

Kassem Dib|9.4.2022|Finite Elements|1 |

Hello everyone, Is it possible to use pore fluid- stress element in abaqus standard when soil is modeled using SANISAND constitutive model ? (UMAT)

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“Warning LNK4210” – hypoplastic clay UMAT

Yu Xiao|8.4.2022|Constitutive Modelling|1 |

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). […]

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Prague Geotechnical Days 2022 with Prague Geotechnical Lecture by prof. Cino Viggiani

David Mašín|7.4.2022|Event Announcements|0 |

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 […]

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Micropiles load tests database

Majd Abou Alhaija|26.3.2022|Finite Elements|0 |

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, […]

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DIANA 10.5 new features

jesus mediavilla|10.3.2022|Finite Elements|0 |

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

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Input files for element tests for hypoplastic clay/sand UMAT

Juan Tello|6.3.2022|Constitutive Modelling|0 |

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 […]

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Combining Hypoplastic-sand and Hypoplastic-clay in one UMAT file

anis kheffache|2.3.2022|Constitutive Modelling|0 |

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 […]

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UMAT code for Unsaturated soil modes

Arghya Das|19.2.2022|Finite Elements|1 |

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 […]

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SSE and SPD Mohr Coulomb Crieria

Matías Sáez de Tejada|3.2.2022|Constitutive Modelling|1 |

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?

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Papers on Excalibre

David Mašín|19.1.2022|Constitutive Modelling|0 |

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). […]

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Abaqus UEL Hypoplasticity

anis kheffache|16.1.2022|Constitutive Modelling|0 |

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 […]

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Hypoplasticity UDSM and Preferred Units (SI or Imperial) in Plaxis

Keng-Wit Lim|14.1.2022|Constitutive Modelling|0 |

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Three PhD positions in soil mechanics at Charles University, Czech Republic

Gianvito Scaringi|13.1.2022|Position Announcements|0 |

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 […]

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Hypoplastic UMAT & Void Ratio

Hashmi Sohawon|15.12.2021|Constitutive Modelling|0 |

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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