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Basic Data

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 geotechnical survey or from laboratory experiments. If these data are not available, it is possible to exploit built-in database of soils, which contains values of selected characteristics of soils. The characteristics of rocks are not listed in the database built, 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) is considered effective stress according to the equation N*tgφef + cef*l.
  • undrained conditions: in case of total stress for the calculation of passive forces on the slip surface (circular, polygonal) is considered according to the equation cu*l.

In some countries it is customary to specify both shear strength parameters φu, cu for total stress. In this case it is necessary to specify the task as an effective stress using parameters φef, cef in program "Slope Stability".

The associated theory is described in detail in chapter "Slope stability analysis".

Dialog window "Add new soils" - "Basic data"