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Add Bolt Pattern

A regular pattern of bolts can be applied to the slope face or upper slope face of a block with the Add Bolt Pattern option. The pattern location, bolt length, spacing, orientation, and offset from origin can all be defined by the user.​

To apply a pattern of bolts to the analysis:

  1. Select Support > Bolt Patterns > Add Add Bolt Pattern Icon
  2. This will open the Add Bolt Pattern dialog.
    1. Select the desired Bolt Property. To add, edit, or delete Bolt Properties, select the Edit icon next to the Bolt Property dropdown.
    2. Provide a value for the Bolt Length.
    3. Set the Orientation method as either Normal to Selected Face or defined by Trend and Plunge values.
    4. Select the Slope Face or Upper Slope Face as the Installation Face.
    5. In the Bolt Pattern Configuration section, there are two ways to set the configuration:
      1. Manually provide values for the default parameters (Horizontal Spacing, Vertical Spacing, Horizontal Offset, and Vertical Offset), or select the desired offset values graphically on the model using the Select Location option.
      2. Select the Use Intelligent Support Optimization option to design optimal bolt pattern spacing that satisfies the Design Factor of Safety for all analyzed blocks. Bolt pattern configuration to be optimized can be set using a Square or Rectangle configuration and providing Spacing Intervals.
  3. Select OK to apply the Bolt Pattern.
Add Bolt Pattern dialog
Add Bolt Pattern dialog
    When manually defining bolt patterns, multiple patterns can be applied with different bolt properties, lengths, spacing, orientations, etc. by selecting Support > Bolt Patterns > Add again. However, multiple bolt patterns are not supported when using Intelligent Support Optimization.

    Intelligent Support Optimization

    The Intelligent Support Optimization option in the Add Bolt Pattern dialog allows you to streamline the support system design process by creating an optimal bolt pattern specific to a project's Design Factor of Safety. This option is only applicable in a Deterministic Analysis.

    Pattern

    Intelligent Support Optimization accepts either a Square or Rectangle pattern, which will determine the equality of spacing between bolts. A square pattern will have equal spacing between all bolts, whereas a rectangle pattern will have different spacing horizontally and vertically.

    Horizontal Spacing Interval

    The Horizontal Spacing Interval is applied in the optimization process to find the minimum bolt spacing required to meet the Design Factor of Safety. The value of the interval represents the change in horizontal spacing in each iteration of the optimization process.

    For a square pattern, this parameter determines the space interval between each bolt in both horizontal and vertical directions given that they are equally spaced. For a rectangle pattern, you can set the interval followed by a Horizontal/Vertical Ratio to determine the difference in space horizontally vs. vertically (larger ratio = larger horizontal spacing; i.e. if the ratio is 1.5, the horizontal spacing will be 1.5 times the vertical spacing).

    The default Horizontal/Vertical ratio for Rectangle pattern configuration is '1'. If the Horizontal/Vertical ratio is selected as '1' in Rectangle pattern configuration, it will be equal/identical to a square pattern and the results will be same with a square pattern.
    Intelligent Support Optimization in Add Bolt Pattern dialog
    Intelligent Support Optimization in Add Bolt Pattern dialog

    Once the optimized bolt pattern is applied by selecting OK, the Optimized Bolt Pattern Spacing can be found in the Status Bar. Any time a project's input data is modified, the optimized spacing is recomputed and updated in the Status Bar.

      If a pattern that satisfies the specified Factor of Safety (Design Factor of Safety) for all analyzed blocks cannot be found given the parameters, RocSlope2 will notify the user and apply the minimum defined vertical and horizontal pattern.
      Optimized Bolt Pattern not found
      Optimized Bolt Pattern not found
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