Run a Polyhedral Stability Analysis

To run a polyhedral stability analysis, you first need at least two orientation sets containing discontinuities.

The Stability Analysis button is only available when an option in the Analysis section of the Project Tree is selected.

Activity Steps

1. Open the Analysis menu.
2. Select Stability Analysis in the Analysis field group.

   The Stability Analysis Wizard displays.

3. Click Next.
4. Select Polyhedral Block Analysis.
5. Click Next.

   Note: Unlike the Wedge Stability Analysis method, you can use more than two sets of discontinuities. Properties must be defined for each set, as described below.

6. Configure the following fields as required for each orientation set.

   Note: All options may not be available in your orientation sets.

   • Cohesion – Component of shear strength of a rock that is independent of interparticle friction. Units: kPa.
   • Friction – Angle of internal friction. The ability of the rock to withstand shear stress. Units: degrees.
   • Persistence Method – Persistence applied to discontinuities of a set. Select from the following options.
     • Mean – Use the mean persistence of the set.
     • Maximum – Use the maximum persistence of the set.
     • Custom – Manually input the value.
     • Local – Use the persistence of each discontinuity.
7. Click Next.
8. Click Next.
9. Click Finish.