I have a corridor modle that is made up of assemblies which have different subbases (pave1, pave2 and base). If i need to get a volume calcualtion of each one as they compare to my EG, do i need to create a surface for each one using the appropiate link?
Most of the OOTB subassemblies have a common code Datum, which follows the lowermost links on these subs. If you create a corridor surface using the Datum links and then check that in your sections it should be useful for cut and fill earthworks calculations.
Where subassemblies display a shape (Pave1, Base, etc) you can calculate Structure type materials. These calculations are useful for regular shapes in your design section, and are sometimes better when one material extends beyond the ones above at the shoulders.
Just to make sure i am following you on this one:
I have one corridor surface using the "top" link of my corridor, so bottom of my channel basically. If I create another one using "datum" link, it will create a surface that extends to the bottom most part in my corridor? So if i compared those two surface i would see the depth of my subgrades. right?
Yes that should work. You will find that some corridor links have both the Top and Datum codes, so the two surfaces are identical in those parts of the section. The other potential issue will be if you have two Datum surface points with the same x,y coordinate but different elevations - you might see this at the outside edge of your lane sub where the Datum surface suddenly jumps from the underside of that to the Daylight sub. The TIN model may be jagged, or it may not follow the links correctly.
It is always better to use the different pavement layers (pave1, pave2 and base), only thing is you should see that each layer is correctly provided with the top and bottom links.
If the links are properly applied, then surface for each layer is automatically generated and hence you can obtain the respective quantities.
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