GGU-ELASTIC: "Material properties" menu item
You can edit the characteristics. A dialog box appears with a number of input lines dependent on the defined number of materials.

Numerical input for the friction angle phi and the cohesion c are important for analysis of the flow condition after Mohr/Coulomb.
Using the "Common soils" button, you can easily select the soil properties of many common soils from a database or determine intermediate values. In the dialog box, which you open by pressing the "Common soils" button, open the "Soils_english.gng_ggu" file when first starting the program in English ("Edit table"/"Load" buttons). Then save the data set in the "Soils.gng_ggu" file on the program level in order to open your modified database file when the program starts. You can also enter your own data ("Edit table"/"x soils to edit" button) and save it in the "Soils.gng_ggu" file.