Dozer Push

This command simulates a dozer push design from a highwall into a pit on a cross section. The program draws closed polylines that represent the cut and fill areas and the path of the dozer. Dozer Push works with a cross-section view of the pit made from either the Fence Diagram command or Sections and Profiles from Civil. A prerequisite for this command is a polyline that defines the existing ground including the top surface, highwall and pit bottom. A second polyline optional polyline can represent the depth to the Cut Bench to push along, and a third polyline option could be one for the bench or pit bottom for spoil start. The Cut Bench polyline could be the top of of a seam to dig down to, for example. This command does one push at a time. To perform multiple cuts, run Dozer Push for each one.

The Dozer Push command starts with the dialog box shown here:

 

• Horizontal Scale and Vertical Scale: These are the scale factors for the drawing to generate text, symbols, and vertical exaggeration, among other things.
  
• Cut Push Percent:  The Cut Push Percent is the percent grade the dozer cuts down from the surface to the bench polyline or to the selected cut point. There are separate angles for the left and right sides.
  

• Pit Push Percent: The Pit Push Percent is the percent grade that it will push out into the pit before spilling over to the repose angle. Enter as a percent, positive or negative, where positive will push down into the pit, and negative will push up, into a spoil fill pile.

• Repose Angle: Repose Angle is the angle that gravity pulls down the fill slope, as it spills over the edge. Enter as an angle.
  
• Spoil Percent: Spoil Percent is the percent grade of the spoil pile as the dozer pushes uphill. Enter as a percent (up). When there is not enough room in the pit to fit the cut at the pit push percent, the remainder will get placed by building up a spoil pile at this specified Spoil Percent. The program will prompt for a base point to start building the spoil slope with the prompt to Select bottom bench polyline for spoil start. This point is typically at the top or bottom of a seam at the pit bottom so that the spoil pile will not overlap the ore and create extra rehandle. The end point of the Bottom Bench Polyline is where the spoil slope will begin. To verify this, take an imaginary line and draw up from the endpoint of the bottom bench polyline, at the spoil slope, and it will pass through the fill, right on top of the spoil slope position.
  

• Cut Swell Factor: The Cut  Swell Factor is multiplied by the cut area to determine the amount of fill. Enter as 1.2 for 20 percent swell.
• Layer: This layer is used to draw the new entities created by this routine such as the cut and fill polylines and labels.
  
• Use Wedge Angle: With the Wedge Angle option, the cut will begin by starting at the top of pit and moving down at the Wedge Angle for the specified Cut Width. It will continue down at the wedge angle for the specified horizontal width. The Cut Push Percent is not used if the Wedge Angle is used.
  
• Sequence Number: This is the sequence step number that is added to the SEQ sequence file for Process Dragline Sequence.
  
• Direction to Push: The dozer must be specified to push to the right or to the left.
  
• Define Cut Depth By: The Polyline Method will prompt to select the Cut Bench Polyline. The polyline method can use either a closed or open polyline. For a closed polyline, the cut area is defined by the polyline. For the open polyline, the polyline represents the surface that the dozer will cut down to. The dozer cut will be located by finding the top of the pit and then moving back along the top surface for the Cut Width entered below. The top of the pit is identified by finding the first grade that is greater than or equal to the Push Percent grade. Then the dozer will cut down at the Push Percent until it reaches the bench polyline. The Pick Points method will prompt for the lower left point and the lower right point. The line drawn between them is then set to the cut surface. This controls the cut width, so the value entered below for Cut Width will not be used.

• Output Step to Sequence File: Turn this option on to add the step to a new or existing SEQ file. This file is processed with Process Dragline Sequence.
  

• Store Step to Report File: This option will create or append a CUT file that is processed with the command Dragline Section Report. This option requires the Dozer Push design on each each cross section station the length of the pit.
  

• Find Cut/Fill Balance: The Find Cut/Fill Balance is an option that automatically calculates the cut area, where the cut and fill balance (plus swell factor) and so it does not propmpt for picking the cut points and the bench polyline is not used. The command line prompt states "Select existing grade polyline at dozer push start:". The selected point along the existing ground polyline sets the Cut Push percent point. The program will cut down at this slope to define the cut, and then the fill is automatically placed for a Cut/Fill balance.

• Report Average Push: This option labels the average horizontal push distance from the cut centroid, to a point that is up from the fill centroid, at the angle of repose.
  

• Cut Width: When using the Polyline method to Define the Cut Depth, this is the total width of the push, from the Cut Push distance down to the Cut Polyline, then across the Cut Polyline the remaining distance to get to the entered width. See the image above for Define Cut Depth By for the Cut Width labeled.
• Update Existing Polylines: This option will replace the existing ground polyline with the updated ground polyline. Otherwise the existing ground polyline will remain unchanged, and the cut and fill areas are drawn as separate polylines.
  

Label Settings:

• Label Style: Sets the style for the text entities.

• Text Size Scaler: This scaler is multiplied by the Horizontal Scale to set the size of the text entities.
• Area Decimals: Sets the precision for the end areas.
• Cut/Fill/Rehandle Labels: Sets the names for these values.
  
• Label Push Distances: This option will label the distance from the centroid of the cut block to the edge of the highwall to a point above the fill centroid, where the repose angle intersects the fill surface. See the image above for Report Average Push
  
• Draw Centroids: Draws the specified symbol at the centroids for the cut and fill areas.
  

 Prompts

This command handles many types of the dozer push. Which values to use from the dialog and the prompting depend on the design type of the dozer push.

Command: DOZER
To Define Cut Depth by Picking Points:
Select existing grade polyline: pick the ground polyline
Pick lower Left cut point:
Pick lower Right cut point:
Select fill areas to rehandle (Enter for None).
Select objects:
CUT (bsf): 9182.6 REHANDLE (bsf): 0.0 FILL (lsf): 9182.6
PUSH: 141.4,3.6%
Pick Point for Label (Enter for none):

Using Define Cut Depth by Polyline:
Select existing grade polyline: pick the ground polyline
Select cut bench polyline: pick the bench polyline
Select fill areas to rehandle (Enter for none)
Select objects: press Enter
Cut: 308.7 Fill 308.7
Pick Point for Label (Enter for none): pick a point

Using the Find Cut/Fill Balance option:
Select existing grade polyline at dozer push start: pick the ground polyline where the cut is to begin
Calculating...

Pulldown Menu Location: Surface
Keyboard Command: dozer
Prerequisite: Surface and strata polylines