GGU-STABILITY: "Analyse slip bodies" menu item

Once you have specified the slip bodies, computation of safety/utilisation factors can begin.

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Adjust the number of slices to suit your wishes. If the "Test passive earth pressure wedge" check box is activated, the program will examine whether gradients greater than 45° - /2 occur in the passive earth pressure region of the respective slip body. These slip bodies will not be investigated. Slip body movement should to the "left". Begin calculation of all slip bodies using the "All" button.

If you chose to view the graphical representation during computation you will now see the course of the calculations, together with safety factor data, on the screen. A large number of slip bodies can greatly extend computation time. Deactivate the "Graphics during calculations" check box.

Once calculations are complete you will be shown some statistics. Beside stability, the maximum geosynthetics forces resulting from slip body variation are determined.

After confirming with "OK", the slip body with the lowest FOS is displayed.

The initial dialog box is slightly different for calculations using the "General wedge method" or the "Vertical slice method". Although these calculation methods are not slice methods, the program computes the weights, pore water pressures, etc. of the individual slip bodies internally by dividing the system into vertical slices. The "Max. slice width [m]" can be specified in the dialog box. However, a minimum of 10 slices is used for each slip body, regardless of the value specified. A maximum of 500 slices per slip body will be considered. The default value of "0.2" normally provides sufficiently precise results. If you deactivate the "Shear strength on interm. slip lines" switch, the shear strengths on the intermediate slip lines will not be taken into consideration.