Focus Search
By default, a Grid Search in Slide2 uses the currently defined Slope Limits, in conjunction with the Radius Increment, to generate the circle radii associated with each point in a slip center grid. This is described in detail in the Grid Search topic.
The Focus Search options allow the user to focus the Grid Search to specific regions within the slope, using one of the following four options:
Comparison of Focus Methods
The following figures illustrate the effect of different focus methods on the slip surfaces generated by a Grid Search. In each figure, ALL slip circles generated by the Grid Search are shown, colour-coded according to the safety factor.
Default Grid Search, based on Slope Limits. No focus object is used.
| Example of Grid Search using Focus Window
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Example of Grid Search using Focus Line
| Example of Grid Search using Focus Point
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It is important to note that if you define a Focus Object (window, line, point or tangent), then the Slope Limits are NOT used to generate the circle radii, but are still used as a filter, to ensure that only surfaces which intersect the slope within the Slope Limits, will be analyzed.
Only ONE Focus Object may be defined for a given analysis. Multiple Focus Objects are not allowed for a circular slip surface search.