GGU-STABILITY: "Analyse intermediate slip bodies" menu item
- Matthias Jusko
If you have defined a minimum of two polygonal slip bodies, you can have further slip bodies (intermediate slip bodies) calculated from these. The only condition is that both slip bodies have the same amount of slip body points.
You must first specify the number of intermediate points and the number of both slip bodies for which intermediate slip bodies are to be calculated. Using this value, the positions of intermediate points between the x and y coordinates of both boundary slip bodies are determined. The higher this value is, the more intermediate slip bodies will be calculated. If both points of the boundary slip bodies concerned are equal, the program reacts intelligently and sensibly reduces the number of intermediate slip bodies. After pressing the "OK" button calculations will begin. During calculations you will see the slip body which is currently being calculated. You can also prematurely cancel a calculation by pressing the "Cancel" button in the dialog box which appears after calculations have commenced. The lowest safety factor which has been calculated at the time of cancellation, and the number of slip bodies calculated so far will be displayed. After calculations are complete you have transfer the slip body with the lowest safety factor to the list of current slip bodies.
When analysing using the "General wedge method" and the "Vertical slice method", the shear strengths on the intermediate slip lines may be taken into consideration.
The following procedure, e.g., is sensible:
Define a slip body with, e.g., extremely steep inclinations in the active and passive earth pressure areas.
Then duplicate this slip body and change the inclinations to extremely flat. If necessary, alter the positions of slip body points. Confirm the alterations to the duplicated slip body with the [Return] key.
By duplicating the first slip body you ensure that slip body points which are the same for both slip body really are the same and the program therefore does not carry out a variation for such points.
Now select the "Analyse intermediate slip bodies" menu item.