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User-Defined Slip Surface Overview

The Add User-Defined Surface option allows you to define any general slip surface shape as a User-Defined Slip Surface.

This option is only enabled if the Surface Generation Method in the Slip Surface Options dialog is set to User-Defined Surfaces.

To add a user-defined slip surface:

  1. Select the Slip Surfaces slip surfaces workflow tab workflow tab.
  2. Make sure the Surface Generation Method = User Defined Surfaces in the Slip Surface Options dialog.
  3. Select Add User-Defined Surface add slip surface icon from the toolbar or the Surfaces menu.
  4. You will see the Add User Defined Slip Surface dialog. In the dialog, select an existing surface, enter a name and select OK.
  5. The User Defined Slip Surface will be added to the model.

You can add any number of user-defined slip surfaces. To add additional surfaces repeat steps 3 to 5.

A User-Defined Slip Surface is a spherical, ellipsoidal or general slip surface created with one of the Add User-Defined Surface options:

These options are only enabled if the Surface Generation Method in the Slip Surface Options dialog is set to User-Defined Surfaces.

Search Methods and User-Defined Surfaces

When you add a user-defined slip surface:

  • You can apply the Surface Altering Optimization option to User Defined slip surfaces. In this case, the User Defined Surface will be converted to a spline surface and used as the starting location for the Surface Altering Optimization to search for lower safety factor surfaces.
  • You can use the External Geometry Composite Surface option with User-Defined slip surfaces.
  • You CANNOT use the primary Search Methods (e.g. Grid Search, Cuckoo Search, Particle Swarm) in conjunction with User-Defined Slip Surfaces. The two options are exclusive. If you need to analyze user-defined slip surfaces and search for critical surfaces using the primary Search Methods, then you will have to carry out the analyses separately.
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