Quarry Grading

[dbajan]

Hello.

 

In the jpeg I have included in this post, you will see a quarry area and a grading object. The grading object represents a 3:1 slope from the quarry floor, up to a ridge at a set elevation. This ridge is represented by the yellow pline.

 

I am having trouble finding a way to now grade directly west from this set elevation, UP 5% to match the existing quarry wall, to give me a daylight line wherever it does so. This grading including the 3:1 slope is to create a lift of waste to be placed in the quarry.

 

Initially I ran an alignment North South near the current yellow ridge line, and rana template along the alignment to grade to the right at 3:1 to match existing and to the left UP at 5% to match the quarry wall to the left. I have revised this because I want the toe of the 3:1 slope to follow a straight line, as it does in the jpeg, resulting in a varied ridge line (in yellow).

 

I need to grade UP (not down to match, which is what slope grading tools will do), from the yellow line DIRECTLY west at 5% to match the quarry wall on the left wherever it daylights.

 

I thought about running an alignment along the yellow pline which represents my ridge and running a template along that that matches to the left up at 5%. The reason why I havent done this is becuase the yellow line is varied it will run the template perpendicular to it at every sample point, meaning it will grade up to the quarry wall in many diffrent directions at 5% depending on the direction of the yellow line at the sample location. I need to grade up directly west at all times.

 

 

Any sneaky workarounds are welcome. Thank you for your time reading this.

[rustysilo]

Could you post a full size that is actually legible? Or the dwg?

[Coosbaylumber]

I probably use the R-14 functions of Acad in modern versions more than anyone I know of. But used to determine the rate of elevation difference and the using the parallel lines functon, offset to one direction the appropriate amount. Drawing in only the even numbered contours. Making sure they were too long, then clip off each one as it matches up to an existing contour.

 

Measure the volume underneath the lines to existing, and then, Oh, too much dirt then?

 

Built an awful lot of developments (plus storm channels and river embenkments) this method, and are still standing today.

 

Wm.

[rustysilo]

All I could think of off the top of my head would be this:

 

• Draw feature lines at intervals (depending on the desired accuracy) from your baseline (where you're grading from) in a westerly direction. Make these lines however long you think they will need to be. Make them all the same length and be sure they are long enough to match the grade at the highest point.
  
• Connect them together on the ends along the baseline and the ridgeline. In the end they will form a ladder shape of sorts.
  
• Create a surface from said feature lines.
  
• Create a volume surface using the EG surface as the base and the newly created surface (feature line surface) as the comparison. The zero contour will be where these two surfaces intersect and that will be your line.

I'm not sure if there is a easier way to do this with normal C3d tools, but this would be one way to accomplish it. After you get that zero contour you can then compose the actual finished grade surface to use for earthworks.