The volume correction factors simply multiply the
unadjusted Cut volume and the unadjusted Fill volume by the factors you
supply. Nothing more....Deep breath
Now that you know that (and you've proven it
yourself) you can apply them as you wish.
For guidance purposes: we typically use Cut =
1.0 and Fill = 1.15 to 1.22.
We use the Cut = 1.0 because my clients and
contractors basically want to know how much they're cutting into the
ground on a 1:1 basis.
We use the Fill factors as stated, because 1)
usually the Fill is compacted to a higher density than the in-situ
(unless rock), 2) losses in transport, wind , erosion, and 3) factor
of safety, don't want to be short because it is usually less expensive to spill
dirt on the site than have to import.
So taking into account all that,
all we're basically saying is it takes 15%-22% extra volume to fill that
unadjusted Fill volume. I don't see any reason to move the Cut factor from 1.0,
unless the Cut fluffs up and your concerned about how many truckloads
maybe. But then you have to realize your using a fluffed Cut number to
balance your Fill. It also helps for some reason to look at just the Cut
and Fill numbers themselves, not the Net, and think about what you've
got due to the factors you've supplied.
That's my experience, but since you've proven to
yourself what the factors do, use them as you wish. Kind of anti-climatic,
I know.
Oh yeah, don't forget to strip your site of topsoil
first:)
Fred
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">While
using the Grid Volume Method for producing Cut and Fills we wanted to include
the volume correction factor of 0.85 for fill (fill will campact to only 85%
of what is used). When caluclating the cut and fill with the factor it seems
to work incorrectly. The fill is reduced by 15%. If I am thinking of this
correctly it should increase by 15%. Meaning we would need more fill to make
up for the compaction.
The Help says "Type a Cut factor and a Fill factor for the Grid Volumes
Corrections values. These values compensate for expansion and compaction of
the surface material, and help to determine the actual volume of material that
needs to be removed (the cut factor) or added (the fill factor) to the site.
n Cut factor: Compensates for the expansion factor of the material left
after the cut.
n Fill factor: Compensates for the compaction factor of the
fill material.
For example, for a material that expands 15 percent, type the value 1.15.
However, for a material that compacts to 93 percent of its original value,
type 0.93. A factor of 1.00 does not adjust the volumes"
Am I doing this wrong?
Maria
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