Analysis

The "Analysis" frame displays the analysis results. Several analyses can be performed for a single task.

The starting point in the slope stability analysis is the selection of the type of slip surface. The input is available from a combo list in the left top part of the frame containing two options – circular slip surface and polygonal slip surface. After introducing the slip surface the analysis is started using the "Analyze" button. The analysis results appear in the right part of the frame.

The type of analysis is selected in the mid section of the frame – three methods are available for the circular slip surface (Fellenius/Petterson, Bishop, Spencer, Janbu or Morgenstern-Price method), the polygonal slip surface is analyzed exploiting either the Sarma, Spencer, Janbu or Morgenstern-Price method. For both cases of the assumed slip surfaces it is possible to perform the analysis employing all methods at once (in such a case, however, the slip surface cannot be optimized).

The actual verification of slope stability can be performed, depending on the setting in the frame "Analyses methods", as:

-	according to EN 1997, where the loading is reduced by the analysis partial factors and the verification is performed according to the theory of limit states
-	according to the classical theory – with the verification based on the factor of safety / theory of limit states depending on the setting in the frame "Settings".

Based on the "Settings" in the frame the verification of the slope stability is performed using either the factor of safety concept or the theory of limit states.

Analysis type option "Optimization" allows for optimizing either the circular or polygonal slip surface. This step also activates the "Restrictions" button – pressing this button changes the frame appearance and makes it possible to introduce restrictions on the optimization procedure.

It is also possible to specify how to deal with anchors in the analysis (box "Assume anchors as infinite").

The slip surface, even the optimized one, must be introduced in the frame – several possibilities are available:

Circular slip surface
	using mouse – press the "Input" button to active the input regime and then by clicking the left mouse button enter three points to define a circular slip surface (the introduced slip surface can be further modified using the "Modify" button or specified again with the help of the "Replace" button
	using the dialog window – pressing the "Input" button in the "Circular slip surface" frame opens the "Circular slip surface" dialog window that allows for specifying the radius and coordinates of center

Polygonal slip surface
	using mouse - press the "Input" button to active the input regime – entering the surface points proceeds in the same steps as when specifying interfaces
	using table – pressing the button "Input" actives several buttons that allow for filling the adjacent table with the coordinates of slip surface points (buttons "Add", "Modify", "Remove")

The analysis results appear in the left part of the frame and the optimized slip surface on the desktop. Visualization of results can be adjusted in the "Visualization style settings" dialog window.

Frame "Analysis" - circular slip surface

Frame "Analysis" - polygonal slip surface