SoilModels Forum

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|1 |

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|4 |

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|1 |

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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Transient Dynamic analysis (U-P formulation)

anis kheffache|4.12.2021|Finite Elements|4 |

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 […]

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Survey on Teaching / Learning Constitutive Models

Gertraud Medicus|11.11.2021|Constitutive Modelling|0 |

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Modelling TX monotonic compressive test with ABAQUS and SANISAND – not working

Riccardo Zabatta|3.11.2021|Constitutive Modelling|9 |

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 […]

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Vibration foundation behavior

Naif Alsanabani|16.10.2021|Finite Elements|0 |

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 […]

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Getting started with UMAT for Hypoplastic clay model in ABAQUS

Kanika Lamba|15.10.2021|Constitutive Modelling|0 |

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 […]

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consistent tangent stiffness calculation in hypoplasticity sand UMAT

Ran Tu|7.10.2021|Constitutive Modelling|1 |

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 […]

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stress order in hypo umat seems to be incorrect

Ran Tu|6.10.2021|Constitutive Modelling|3 |

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 […]

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ALERT doctoral school on constitutive modelling – hands on session triax input files

David Mašín|2.10.2021|Constitutive Modelling|0 |

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 […]

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Initial Stiffness of CU test in Masin’s 2014 Model

Shen Wang|29.9.2021|Constitutive Modelling|1 |

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 […]

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CONSTUTUTIVE MODELLING

MOHD SAQIB|22.9.2021|Constitutive Modelling|0 |

Can SANISAND version given in soil model work well for cyclic simple shear test ?

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Compatibility of subroutines in ABQ2021

Erick Kencana|17.9.2021|Constitutive Modelling|1 |

Hi Admin, I have been using hypoplastic subroutine supplied by this website. It works well in ABQ6.14 and ABQ2017. However, recently I have to upgrade to ABQ2021 due to an […]

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Hypoplasticity sand convergence issues

anis kheffache|17.9.2021|Finite Elements|2 |

Hi everyone, i am modeling laterally loaded monopile using abaqus, My 3d model looks like this, only half of the model is simulated, symmetry boundary conditions is applied to the […]

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MATLAB Code for Bounding Surface Plasticity Model

A S M RIYAD|17.9.2021|Constitutive Modelling|0 |

Dear Altruists, I just wanted to learn the bounding surface plasticity theory with coding. Does anyone have any code (written in MATLAB) for the Bounding Surface Plasticity model? Could you […]

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Non convergence problem in abaqus using hpoeca Clay Hypoplasticity in slope model

Yang Xue|16.9.2021|Constitutive Modelling|4 |

hello everyone! based on the strength reduction method in clay hypoplasticity, firstly, I used two steps belong to the static_general, the first step is impose a gravity load, and not […]

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UMAT file for POROELASTICITY

Angu Praveen Muthu Swamy|31.8.2021|Constitutive Modelling|0 |

Anyone has any reference to writing UMAT file for Poro linear elastic properties or what constitutive equations have to be solved to do the same. Any help would be appreciated […]

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Cyclic/monotonic direct shear test (matlab driver)

anis kheffache|2.8.2021|Constitutive Modelling|2 |

Hi everyone, i am trying to simulate DSS/cDSS test in drained/undrained conditions and I was wondering how the constraints matrices should be ? while it is easy to understand how […]

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Convergence issue of unload of clay consolidation in Abaqus

Shen Wang|10.7.2021|Constitutive Modelling|5 |

Hello, I was trying to simulate the unloading process of clay consolidation in Abaqus using clay hypoplasticity umat (https://soilmodels.com/download/plaxis-umat-hypoplas-zip/). But I had a convergence issue showing in Fig.1. The model […]

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Convergence issue of unload of clay consolidation in Abaqus

Shen Wang|10.7.2021|Constitutive Modelling|1 |

Hello, I was trying to simulate the unloading process of clay consolidation in Abaqus using clay hypoplasticity umat (https://soilmodels.com/download/plaxis-umat-hypoplas-zip/). But I had a convergence issue showing in Fig.1. The model […]

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