Exclusion Zone Tool

SHOTPlus White.png

SHOTPlus™ Variant:
Surface
Version:
Beta 6.11.10 or Production 6.11.1 and above
KBA Summary:
This Knowledge Base Article details how the Exclusion Zone Tool within SHOTPlus™ works.

Summary

The SHOTPlus™ Exclusion Zone Tool enables users to generate an exclusion zone.

Users should exercise caution and ensure a thorough risk assessment is completed when defining an exclusion zone.

The SHOTPlus™ Exclusion Zone Tool is an empirical calculator that generates a theoretical Exclusion Zone based on estimated flyrock travel distances. Site specific information should be taken into account when using these estimations to define any exclusion zone.

Outputs

The Exclusion Zone Tool enables users to two generate two different outputs:

  • A polygon that represents the estimated maximum horizontal travel distance of flyrock, plus a nominated safety factor.
  • A surface that represents the estimated trajectory of flyrock based on a 45° launch angle, plus a user nominated safety factor.

These outputs can be based on either:

  • Visible holes in a plan; or
  • Selected holes in a plan.

Outputs can be clipped to either:

  • The plane of the blasthole collars; or 
  • The registered topography surface.
Navigation

Open the Exclusion Zone Tool by either:

  • Selecting the Exclusion Zone Tool from the main toolbar; or

Tool icon.png

  • Selecting Tools General functions > Mark clearance zone from the main toolbar.

Mark Clearance Zone.png

Functionality

The exclusion zone outputs, generated by the Exclusion Zone Tool, can be based on either:

  • A user-defined radius from blastholes within a plan.
  • A flyrock calculation, based on user-defined model inputs, plus a nominal safety factor.
  • A flyrock calculation, based on user-defined model inputs and blast design properties, plus a nominal safety factor.
Constant Radius Manual Entries Blast properties
To generate an exclusion zone output based on a constant radius from blastholes within a plan:
  1. Select Constant radius from the drop down list.
  2. Select Base exclusion zone on either:
    • All visible holes - to base the exclusion zone on all visible holes in the plan; or
    • Selected holes - to base the exclusion zone on selected holes in the plan.
  3. Select the desired exclusion zone radius.

Constant Radious.png

Polygon Output Surface Output

To add polygon based on the Constant Radius settings:

  1. Select the Polygon tab.
  2. Select Clip to either:
    • Plane of hole collars - to clip the output to the plane of the blasthole collars; or 
    • Surface topography - to clip the output to the registered topography surface.
  3. Select the desired polygon colour for the exclusion zone from the drop down box.
  4. Select the desired layer destination for the exclusion zone polygon.
  5. Enter the desired text tag for the exclusion zone polygon.
  6. Select Add to plan to add the generated exclusion zone polygon to the plan as a layer.

Constant Radious Polygon.png

Flyrock Calculations

The SHOTPlus™ Exclusion Zone Tool can generate an exclusion zone based on a constant radius from blastholes within a plan, or calculated horizontal flyrock travel distances.

When based on calculated horizontal flyrock travel distances, three sources of flyrock are evaluated:

Face Burst: Generated only from the nominated front row hole type, as designated in the Exclusion Zone Tool. The direction of throw for face burst is set within the Exclusion Zone Tool, or can be based on the slice direction for each front row blasthole, as detailed below in the Flyrock Tool Inputs section of this KBA. The launch angle for all flyrock generated by face burst is assumed to be 45°.
 

 

Stemming Ejection: Generated from all blastholes. The launch angle for stemming ejection is set within the Exclusion Zone Tool when basing the flyrock prediction on Manual entries or is based on the blasthole angle when based on Blast properties.
 

 

Cratering: Generated from all blastholes. The launch angle for cratering is set within the Exclusion Zone Tool when basing the flyrock prediction on Manual entries or is based on the blasthole angle when based on Blast properties.
 

 

Once each source of flyrock is evaluated the exclusion zone generated is based on the maximum calculated horizontal flyrock travel distance in each direction, multiplied by the desired safety factor.

Flyrock Tool Inputs
K Factor: Also known as the flyrock constant. Used to calibrate the flyrock calculation to site specific conditions. The higher the K Factor, the more conservative the calculation i.e. the model that flyrock will travel further.
   
Cratering Dispersion Angle: Describes the angle, from the hole angle or launch angle at which cratering so projected at. This forms a theoretical cone from the hole's collar at which cratering may be projected at.
   
Cone II.png
   
Safety Factor: The factor which the maximum calculated flyrock travel distance will be multiplied by to generate the exclusion zone.
   
Direction of Throw: Direction of throw for face burst generated from front row blastholes. When basing a flyrock calculation on Blast properties, this can be set to the hole's slice direction instead.
   
Launch Angle: The launch angle for flyrock generated from stemming ejection and cratering. This is only required when basing a flyrock calculation on Manual entries.
   
Front Row Burden: Front row burden used to calculate face burden generated from front row blastholes. This is only required when basing a flyrock calculation on Manual entries
   
Stemming Height: Stemming height used to calculate stemming ejection and cratering generated by all blastholes. This is only required when basing a flyrock calculation on Manual entries.
   
Charge Mass per Meter/Foot: Charge mass per unit length of the blasthole, used to calculate flyrock generated by all blastholes. This is only required when basing a flyrock calculation on Manual entries.
   

References

Richards, A B and Moore, A J (2004), Flyrock Control – By Chance or Design in the proceedings of The 30th Annual Conference on Explosives and Blasting Technique, (The International Society of Explosives Engineers: New Orleans, Louisiana, USA)

Was this article helpful?
3 out of 3 found this helpful
Have more questions? Submit a request