This part of the window serves to introduce basic parameters of soils - unit weight, angle of internal friction, and cohesion. The particular values are obtained from a geotechnical survey or from laboratory experiments. If this data is not available, it is possible to exploit the built-in database of soils, which contains values of selected characteristics of soils. The characteristics of rocks are not listed in the built-in database, these parameters must be defined manually. Approximate parameters of rocks are presented in the theoretical part of the Help herein.
The analysis method of slope stability differs for:
- drained conditions: for the slope stability calculations to determine equilibrium conditions on the slip surface (circular, polygonal), the effective stress is considered according to the equation N*tgφef + cef*l.
- undrained conditions: in case of the total stress, the calculation of passive forces on the slip surface (circular, polygonal) uses the equation cu*l.
In some countries it is customary to specify both shear strength parameters φu, cu for the total stress. In this case it is necessary to specify the task as an effective stress using parameters φef, cef in the "Slope Stability" program.
The associated theory is described in detail in the "Slope stability analysis" chapter.
"Add new soils" dialog window - "Basic data"