Calculations of soil pressure, deformation and ground behaviour when loaded with the weight and stresses of buildings and structures are essential for engineering design and for dimensioning of foundation solutions and support structures. Analyses of interaction between soil and construction are also important for optimum dimensioning.

NGI's specialist expertise

  • combining good command of selected simulation tools and an understanding of geomechanical processes and material behaviour
  • development of numerical models for the mechanical behaviour of geomaterials

NGI may make use of the finite element method (FEM) to simulate the behaviour of foundations in large structures. We have also developed customised programs of our own for dynamic behaviour of foundations and the capacity of suction anchors and skirt foundations in clay and sand.
Analytical tools are used for simulating various geomechanical processes, including:

  • static and dynamic interaction between structures and the ground
  • displacement and load capacity of foundations
  • modelling of braced construction pits
  • modelling of oil and gas reservoirs, soil slides and avalanches, tsunamis and one- and two-phase flows in porous media.
Num meth Plaxis Finite Element analyses at NGI

Research and development

The challenges and NGI research efforts relating to numerical modelling include:

  • contributions to the PLAXIS expert panel
  • fracture development in friction materials
  • analytical tools for large deformations in cooperation with the University of Stuttgart
  • geotechnical calculation pack GeoSuite, in cooperation with large parts of the Norwegian and Swedish engineering profession
  • materials model for cyclical behaviour of clay
  • calculation model for progressive fractures in sensitive clay

Relevant analytical software

  • Plaxis software package
  • Itasca programpakke (FLAC, UDEC, PFC
  • Geoslope programpakke
  • Phase2
  • Comsol multiphysics modeling