numgeo

Geotechnical Finite Element Analyses

numgeo

a 2D and 3D non-linear multi purpose finite element program for geotechnical boundary value problems

Effective horizontal stress during vibratory pile driving
Simulation of the long-term deformations of a pile using the high-cycle accumulation model

Key program features

numgeo features different multi-phase element formulations that can be used for quasi-static as well as dynamic
problems (u-p Elements, u-p-U elements, u-U elements):

numgeo offers a wide variety of sophisticated constitutive soil models:

numgeo uses state-of-the art mortar contact discretisation techniques:

Research output​

  1. Jan Machaček, Patrick Staubach. numgeo: A finite-element program for the simulation of hydro-mechanically coupled geotechnical processes. Fachsektionstagung Geotechnik, 2021.[ Deutsche Gesellschaft für Geotechnik e.V. (DGGT).]
    [BibTeX] [Download PDF]
    @inproceedings{ machaček2021numgeo,
      title={numgeo: A finite-element program for the simulation of hydro-mechanically coupled geotechnical processes},
      author={ Machaček, Jan and Staubach, Patrick },
      booktitle={Fachsektionstagung Geotechnik},
      year={2021},
      publisher={Deutsche Gesellschaft für Geotechnik e.V. (DGGT)}
    }
  2. Jan Machaček, Patrick Staubach, Merita Tafili, Hauke Zachert, Torsten Wichtmann. Investigation of three sophisticated constitutive soil models: From
    numerical formulations to element tests and the analysis of vibratory pile driving tests. Computers and Geotechnics, 138: 104276, 2021. https://doi.org/10.1016/j.compgeo.2021.104276
    [BibTeX] [Download PDF]
    @article{machaček2021,
      title={ Investigation of three sophisticated constitutive soil models: From
    numerical formulations to element tests and the analysis of vibratory pile driving tests}, author={Machaček, Jan and Staubach, Patrick and Tafili, Merita and Zachert, Hauke and Wichtmann, Torsten}, journal={Computers and Geotechnics}, year={2021}, pages={104276} }
  3. Patrick Staubach, Jan Machacek, Torsten Wichtmann. Large-deformation analysis of pile installation with subsequent lateral loading: Sanisand vs. Hypoplasticity. Soil Dynamics and Earthquake Engineering, 151: 106964, 2021. https://doi.org/10.1016/j.soildyn.2021.106964
    [BibTeX]
    @article{staubach2021large,
      title={Large-deformation analysis of pile installation with subsequent lateral loading: Sanisand vs. Hypoplasticity},
      author={Staubach, Patrick and Machacek, Jan  and Wichtmann, Torsten},
      journal={Soil Dynamics and Earthquake Engineering},
      year={2021},
      pages={106964},
      publisher={Elsevier}
    }
  4. Patrick Staubach, Jan Machacek, Lisa Tschirschky, Torsten Wichtmann. Enhancement of a high-cycle accumulation model by an adaptive strain amplitude and its application to monopile foundations. International Journal for Numerical and Analytical Methods in Geomechanics, 151: 1-24, 2021. DOI: 10.1002/nag.3301
    [BibTeX] [Download PDF]
    @article{staubach2021enhancement,
      title={Enhancement of a high-cycle accumulation model by an adaptive strain amplitude and its application to monopile foundations},
      author={Staubach, Patrick and Machacek, Jan and Tschirschky, Lisa and Wichtmann, Torsten},
      journal={International Journal for Numerical and Analytical Methods in Geomechanics},
      year={2021},
      pages={1-24},
      publisher={Wiley}
    }
  5. Patrick Staubach, Jan Machaček, Raihan Sharif, Torsten Wichtmann. Back-analysis of model tests on piles in sand subjected to long-term lateral cyclic loading: Impact of the pile installation and application of the HCA model. Computers and Geotechnics, 134: 104018, 2021. https://doi.org/10.1016/j.compgeo.2021.104018
    [BibTeX] [Download PDF]
    @article{staubach2021back,
      title={Back-analysis of model tests on piles in sand subjected to long-term lateral cyclic loading: Impact of the pile installation and application of the HCA model},
      author={Staubach, Patrick and Machaček, Jan and Sharif, Raihan and Wichtmann, Torsten},
      journal={Computers and Geotechnics},
      year={2021},
      pages={104018}
    }
  6. Patrick Staubach, Jan Machacek, Josefine Skowronek, Torsten Wichtmann. Vibratory pile driving in water-saturated sand: Back-analysis of model tests using a hydro-mechanically coupled CEL method. Soils and Foundations, 61: 144-159, 2021. https://doi.org/10.1016/j.sandf.2020.11.005
    [BibTeX] [Download PDF]
    @article{staubach2021vibratory,
      title={Vibratory pile driving in water-saturated sand: Back-analysis of model tests using a hydro-mechanically coupled CEL method},
      author={Staubach, Patrick and Machacek, Jan and Josefine Skowronek and Wichtmann, Torsten},
      journal={Soils and Foundations},
      year={2021},
      pages={144-159},
      publisher={Elsevier}
    }
  1. Jan Machacek. Contributions to the Numerical Modelling of Saturated and Unsaturated Soils. PhD thesis, Veröffentlichung des Instituts für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT), 2020.
    [BibTeX]
    @phdthesis{machacek2020contributions,
      title={Contributions to the Numerical Modelling of Saturated and Unsaturated Soils},
      author={Machacek, Jan},
      school={Veröffentlichung des Instituts für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT)},
      year={2020}
    }
  2. Patrick Staubach, Jan Machacek, Torsten Wichtmann. Validierung eines hochzyklischen Akkumulationsmodells anhand von Modellversuchen an Monopiles mit einer großen Anzahl an Belastungszyklen. Leipziger Kolloquium Forschung in der Geotechnik, 2020.[ Hochschule für Technik, Wirtschaft und Kultur Leipzig.]
    [BibTeX] [Download PDF]
    @inproceedings{staubach2020validierung,
      title={Validierung eines hochzyklischen Akkumulationsmodells anhand von Modellversuchen an Monopiles mit einer großen Anzahl an Belastungszyklen},
      author={Staubach, Patrick and Machacek, Jan and Wichtmann, Torsten},
      booktitle={Leipziger Kolloquium Forschung in der Geotechnik},
      year={2020},
      publisher={Hochschule für Technik, Wirtschaft und Kultur Leipzig}
    }
  1. Patrick Staubach, Jan Machacek. Einfluss der Relativbeschleunigung bei dynamischer Beanspruchung von Mehrphasenmedien am Beispiel der
    Vibrationsrammung. Fachsektionstagung Geotechnik, pages 340-345, 10, 2019.[ Deutsche Gesellschaft für Geotechnik e.V. (DGGT).]
    [BibTeX] [Download PDF]
    @inproceedings{staubach2019einfluss,
      title={Einfluss der Relativbeschleunigung bei dynamischer Beanspruchung von Mehrphasenmedien am Beispiel der
    Vibrationsrammung}, author={Staubach, Patrick and Machacek, Jan}, booktitle={Fachsektionstagung Geotechnik}, year={2019}, pages={340-345}, month={10}, publisher={Deutsche Gesellschaft für Geotechnik e.V. (DGGT)} }

About numgeo

Jan Machacek started the numgeo project in early 2017 during his time as a PhD researcher at the Institute of Soilmechanics and Rockmechanics (IBF) of the Karlsruhe Institute of Technology. End of 2018 Patrick Staubach joined the development of numgeo. Since then, numgeo is our joined effort to combine advanced element formulations and sophisticated constitutive models for the simulation of geotechnical boundary value problems