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surface construction thickness?

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Message 1 of 6
Solway
390 Views, 5 Replies

surface construction thickness?

Hi guys

 
im learning civil 3d, (and comparing it to my other older software) im needing to create a cut and fill report for a huge 1200+ housing and roads development which is on a steep hill site.
 
ive created a surface for the existing ground (EG) and also the surface for the proposed finish levels (FG), using polylines as contours
now i can create a tin volume between EG and FG to get a rough idea on the cut and fill volume. However i need to get it more accurate, because its such a huge site even 50mm makes a 20,000m3 difference lol.
 
i have some questions:
 
first off i need to strip the toposil off the site, it varies from 300mm to 400mm in depth - i guessed at just lowering the EG surface by -350 on average, unless that is any other ways?
 
secondly, and most importantly, i need to account for the volume to calculate to the underside of the surface formation / construction build up of the FG
i.e. for a road it could be 600mm thick in hardcore/tarmac. Is there a way in civils 3d to specifiy certain areas of the site to have difference construction thickness?? for example, roads 600mm, gardens 200mm, buildings 300mm?
 
for example im looking for a volume, from the existing ground surface (-350mm in topsoil) to the underside of the construction depth of the proposed surface
 
hope that makes sense??
5 REPLIES 5
Message 2 of 6
neilyj666
in reply to: Solway

If you have trial pit/borehole data then you can use the sampled depths at the correct locations to get a stripped surface see http://civilintentions.blogspot.co.uk/2012/05/creating-geological-surfaces-from.html

 

There are a couple of workaround ways to get the formation surfaces (this is my preferred method http://ericchappell.blogspot.co.uk/2012/01/magical-way-to-calculate-volumes.html) - how much have you used Civil 3D and what was the other software you used?

neilyj (No connection with Autodesk other than using the products in the real world)
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Message 3 of 6
Solway
in reply to: Solway

only have used autocad before. if you can link to tutorials or point me in the right direction.

other software was a QS software that can generate cut and fill, but its very long winded and bad interface to see how the ground shaped, just inputting millions of levels and crossing fingers

Message 4 of 6
neilyj666
in reply to: Solway

Try this also

http://au.autodesk.com/au-online/classes-on-demand/class-catalog/2013/infrastructure-design-suite/ci...

neilyj (No connection with Autodesk other than using the products in the real world)
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AEC Collection 2024 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
64Gb RAM Intel(R) Xeon(R) W-11855M CPU @ 3.2GHz
NVIDIA RTX A5000 16Gb, Dual 27" Monitor, Dell Inspiron 7760
Message 5 of 6
Solway
in reply to: Solway

thanks, bit of bed time read lol

 

oh, and one of the blogspot links don't work

Message 6 of 6
neilyj666
in reply to: Solway

try this http://ericchappell.blogspot.co.uk/2012/01/magical-way-to-calculate-volumes.html although it is similar to the Autodesk university stuff

neilyj (No connection with Autodesk other than using the products in the real world)
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AEC Collection 2024 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
64Gb RAM Intel(R) Xeon(R) W-11855M CPU @ 3.2GHz
NVIDIA RTX A5000 16Gb, Dual 27" Monitor, Dell Inspiron 7760

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