The aim of this tutorial is to demonstrate the assumptions of the different Porous_flow_type keyword options within Group_data as well as the implications for prescribed pore pressure loading. Thus, the specific objectives are:

 

1.To understand the underlying assumptions for each porous flow type

2.To understand the meaning and differences between "Element Pore Pressure" and "Pore Pressure" variables as well as understand when to expect them being output

3.To learn how to define appropriate pore pressure loading and support data depending on the porous flow type

 

To that end a column geometry with two groups will be used to apply gravity initialisation with hydrostatic pore pressure (where applicable) for the different porous flow types available. Two cases are considered:

 

•Case01 will focus on explaining the results after gravity initialisation in terms of stress and pore pressure for each porous flow type

•Case02 will focus on explaining the appropriate pore pressure loading type for each porous flow type (where applicable)

 

The key features of the column and the material are:

 

 

Note that the material is elastic. The stratigraphy top surface is defined (via Stratigraphy_definition and Stratigraphy_horizon) and a small surface load of 0.2 MPa is applied to the top surface via Stratigraphy_surface_load (to avoid developing tensional stresses at the top surface).