Geomechanics and Geotechnics


Hypoplastic interface model

Frictional interface model for granular soils based on Hypoplasticity using the hypoplastic UMAT Implementation from the webpage. 

Download under GNU licence: Implementation by: Henning Stutz

FRIC and short documentation 

Please refer to the following literature using the model

  • Stutz, H., Mašín, D., Sattari, A. and Wuttke, F. (2017). A general approach to model interfaces using existing soil constitutive models - application to hypoplasticity. Computers and Geotechnics , Volume 87, July 2017, Pages 115-127 (doi: 10.1016/j.compgeo.2017.02.010).
  • Stutz, H., Mašín, D. and Wuttke, F. (2016)  "Enhancement of a hypoplastic model for granular soil-structure interface behaviour", Acta Geotechnica 11, No. 6, 1249-1261.

When using implementations from in your research, please cite it asG. Gudehus, A. Amorosi, A. Gens, I. Herle, D. Kolymbas, D. Mašín, D. Muir Wood, R. Nova, A. Niemunis, M. Pastor, C. Tamagnini, and G. Viggiani. The project. International Journal for Numerical and Analytical Methods in Geomechanics, 32(12):1571-1572, 2008.

Drying Path of Soil Water Characteristic Curve (SWCC)

The drying path of soil-water characteristic curve (SWCC) of a non-plastic particulate medium while using finite difference and Newton Raphson (Jacobian) approximations for determining the air-entry pressure (AEP) in interparticle pore throats is simulated.

Download files

1. Drying SWCC (requires MATLAB)



  •  Sattari, A.S., Siebeliest, M., Toker, N.K. and Wuttke, F. (2018). Simulation of drying SWCC by correlating the air-entry pressure (AEP) to area of pore throats at particle scale. Computers and Geotechnics Journal. (Submitted)
  •  Sattari, A. S. and Toker, N.K. (2016). Obtaining Soil-Water Characteristic Curves by Numerical Modeling of Drainage in Particulate Media. Computers and Geotechnics Journal, Vol. 74, 196-210.