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FEM 

GEO5

Geotechnical software

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Task input

Consider a flat ground loaded by a uniform surcharge of the magnitude of 250 kPa and spread symmetrically over the width of 4m. Determine its settlement both at the end of the loading step and after unloading. The geological profile is homogeneous and the soil has the following parameters:

- Bulk weight of soil [KN/m3] 19 [γ]
- Modulus of elasticity [MPa] 15 [E]
- Pisson’s number [ - ] 0,35 [ν]
- Cohesion [kPa] 8 [c]
- Angle of internal friction [o] 29 [φ]
- Angle of dilation [o] 0 [ψ]
- Bulk weight of saturated soil [KN/m3] 19 [γsat]

The Mohr-Coulomb material model with no hardening/softening is selected to model the soil response (the results derived for other material models are compared at the end of this example).

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Soil parameters input

In the next step we define margins of the geometrical model and the soil profile using the frame "Interface". Margins are specified such as to have the vertical boundaries of the geometrical model sufficiently far from the applied load. The selected depth of the model is set equal to 15m - the soil below this level is therefore considered as incompressible. Finally we assign the specified soil to the selected interface (region bounded by the ground surface and boundaries of the geometrical model).

Terrain shape and assigned soil

The next step of the topology input is to generate the finite element (FE) mesh.

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