Cut and Fill Slope Areas and Angle Analysis

[neilyj666]

I need to get the areas of cut and fill split by slope 0-10°, 10-17°, 17°-45°, 45°-90°. I can get the cut and fill and the slopes in separate analyses but I can't see a simple way of getting both apart from XML export to another modelling package that can do this.

Extracting contours is clunky and prone to hanging/crashing when used for further analysis so has anyone got any ideas as this is a common UK requirement but I'm stumped

Thanks

Neil

[samir_rezk]

Hi @neilyj666 

I assume the slope analysis will be run on a grading surface and the cut and fill calcs are based on a volume surface. With that said, I would run the slope analysis on the ranges you need, then extract the analysis solids from the surface, and create boundaries around those areas (the LINEWORKSHRINKWRAP command may work for this!) 

Convert the area Polyline boundaries to Parcels, then use the Parcel Volume Report from the Toolspace Toolbox tab -> Reports ->  Parcels. This report will give you the cut and fill per parcel (i.e the slope range identified in the parcel!)

It’s a bit of a workaround but hope it helps,

[neilyj666]

@samir_rezk thanks for the reply but I don't think this is going to work for me due to the size and complexity of the surfaces...and I now have the blue circle of death on the screen...😢

If I could get the areas of cut and fill as boundaries and the slope areas similarly, I could do a GIS Intersection analysis but I suspect I'll run into the same issue.

I did this in less than 10 minutes in the other software I use so don't know why it is so convoluted in Civil (if it works at all)...!!!!

[neilyj666]

I managed to come up with something that worked - extracting the level object from the VS, isolated the cut objects, converting to regions and shrinkwrapping to get the areas (and removing some problem areas).  I then copied the formation surface and added a hide rectangle, then added the shrinkwrapped polylines as show boundaries to give a formation cut only surface and finally ran the slope analysis on this cut only surface.

Screenshot shows the slopes in the cut areas only by required slopes with an acceptable correlation with the total cut area also shown in another table.

To finish the exercise, I could run the slope analysis for the full surface and deduct the cut areas already computed from the totals to give a similar analysis for the fill areas. 

This took around an hour for a small part of my project which isn't great for a fundamental requirement in the UK.