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Registered: ‎01-29-2011

# how to Define Vegetable soil Thickness when Calculating Earthwork Volumes

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01-26-2012 05:49 AM

when i want to Calculate Earthwork Volumes there are some factors :

• The Cut factor is typically used as an expansion factor for excavated material. It is usually 1.0 or higher.
• The Fill factor is typically used as a compaction factor for fill material. It is usually 1.0 or higher.
• The Refill factor indicates what percentage of cut material can be reused as fill. It should be 1.0 or lower.

but no one aren't use full for exactly Define the Vegetable soil Thickness in cut and fill, is there another way?

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Registered: ‎12-18-2002

# Re: how to Define Vegetable soil Thickness when Calculating Earthwork Volumes

If this is a constant value you could copy the og surface, raise it the thickness of the veg surface, and then use Volumes to compare the two surfaces.

It's not a 'factor' but it makes it fast and easy to get the number.

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Valued Mentor
Posts: 277
Registered: ‎09-23-2008

# Re: how to Define Vegetable soil Thickness when Calculating Earthwork Volumes

That's also how we do it. Paste the existing ground surface into a stripped surface and lower the stripped surface by 6 inches, or however much it needs to be. That way you get a rough volume on stripping  and you take the revised eg into account when filling back up again.

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Registered: ‎08-01-2008

# Re: how to Define Vegetable soil Thickness when Calculating Earthwork Volumes

01-27-2012 02:39 AM in reply to: KirkNoonan

I use this approach:

Input the organic soil thicknesses obtained from trial pits/boreholes etc etc into Civil 3D such that the Z value is the thickness in your local units e.g. 0.3m, 0.25m, 0.175m etc and call it e.g. SOIL THKS

Create a volume surface (VOLSURF) with SOIL THKS as Base and EGL as Comparison surface to give a volume surface where the Z value is the level of the base of organic soil

Create new Surface (BASE OF SOIL) and paste VOLSURF into it and now you have a normal TIN surface of Base of Soil to use as required. This surface remains dynamic so any new soil thickness info is automatically included.  This method assumes interpolated soil thicknesses between site investigation locations (which may not be a valid assumption) so additional dummy thicknesses may be needed as required.

A similar technique can be used to create base of construction (i.e. earthworks formation) level surfaces knowing the finished levels and construction thicknesses e.g. heavy duty road, footpath, landscape area etc.

neilyj
(No connection with Autodesk other than using the products in the real world)

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