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Search Results

Slip Surface Search Method

The Search Method options in the Slip Surface Options dialog allow you to choose the primary search method for the critical surface search. Note:

  • The Search Method option is only available if the Surface Generation Method = Search Methods.
  • It is NOT available if the Surface Generation Method = User Defined Surfaces.
  • The available Search Methods depend on the Surface Type.

Search Method

The Search Methods generate surfaces according to the currently selected Surface Type (sphere, ellipsoid, multi-planar). The primary Search Method options are:

For details on each method see the above links.

Surface Type

It is important to note that the Search Methods will generate surfaces according to the currently selected Surface Type:

  • Sphere - if the Surface Type = Sphere, then the selected Search Method will generate spherical slip surfaces. Sphere can be used with all search methods.
  • Ellipsoid - if the Surface Type = Ellipsoid, then the selected Search Method will generate ellipsoidal slip surfaces. Ellipsoid can only be used with Cuckoo Search or Particle Swarm.
  • Spline – if the Surface Type = Spline, then the selected Search Method will generate spline surfaces. Spline can only be used with Cuckoo Search or Particle Swarm.
  • Multi-Planar - if the Surface Type = Multi-Planar, then you must define search planes with the Add Search Plane by Surface option, and you can use either Cuckoo Search or Particle Swarm search methods.

Weak Layer Handling

See Weak Layer Overview for a detailed description of how weak layers can be handled via the options in this dialog:

  • Heuristic (recommended) – varies the weak layers being activated as the search progresses (only available for Particle Swarm Optimization)
  • Automatic case generation – tries all combinations of weak layers for each slip surface
  • Always snap to highest layer – snaps the slip surface to the highest weak layer at any given point

Surface Altering Optimization

The Surface Altering Optimization option in the Slip Surface Options dialog is also a slip surface search method. It is listed separately from the primary search methods, because it is an optional method, and is performed AFTER the primary search.

The Surface Altering Optimization option uses the results of the primary Search Method (spherical, ellipsoidal or spline surface), converts this to a spline surface if necessary, and searches for a spline surface with a lower safety factor.

See the Surface Altering Optimization topic for details.

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