I have been spending a short while doing a volume from some information I have been given. This included me extending surfaces to match into each other and then combining into a single surface until I now have 2 surfaces, an existing and a proposed.
What I have been asked to do now is show a number of volumes at certain elevations, basically, the lifts in the concrete pours. I know what these elevations are supposed to be, but I just do not know how to easily do this, without having to start creating new surfaces which match into what I already have. I'm sure there must be an easy way to do this and was wondering if someone could explain it to me.
I have an overall volume of roughly 12000 cube, but need to show this in 1.5m lifts. If it was vertical walls would have been no problem, but the sides of my concrete are sloped, as it my existing surface.
Any help would be greatly appreciated.
Solved! Go to Solution.
Solved! by neilyj. See the answer in context.
Solved! by mnorton. See the answer in context.
Using a volume surface the two surfaces being compared meet at elevation zero. I create a surface style to display major contours only and set the contour increment to a number larger than the volume surface elevation range. For example, if the maximum volume surface elevation equals +12 and the minimum volume surface elevation equals -14, I set the contour increment to 15. Only the zero elevation contour will display showing the limits of cut and fill.
A stage storage table would be my first choice but you may be limited on controlling the increments. Simply enter STAGESTORAGE on the command line and provide the data needed in the dialog. It's fairly intuitive.
Otherwise a simple planar surface compared to your target surface using VOLUMES from the surfaces > utilities menu might work. The initial elevation of your flat surface should equal the low point of your target surface. Create the volume entry with the volumes tool and then raise your flat surface the desired increment by simply editing the surface. The volumes displayed in the volume tool can be recalculated with each edit with a single pick.
Not as pretty as a report but you can quickly get your numbers.
I am having a similar issue. I need to determine the volume of cut greater than 5' in order to estimate costs for rock excavation.
I wish I had '12 in order to do the stage storage, but unfortunately I am working in '09. Do you know (remember) if there is a way to do this easily in 09?
The method I described using the surface utilities volume tool is actually pretty effective. I've used it on some fairly complex flood plain analysis with good results which was not always the case in earlier releases of the stage storage extensions. The extensions didn't always seem to agree on what actually constitutes a pond.
For that matter, the planar surface concept works well with volume surfaces too rather than using the volume tool. Same steps.
The elevations in a TIN volume surface represent the heights or cut or fill between the two TIN surfaces being compared. What you need to do is compare the TIN volume surface to a flat planar surface at an elevation of 5' You will probably need to create an empty TIN surface and paste the volume surface into that, because you cannot use one volume surface as part of the definition for another one.
Elevation analysis of a volume surface is another method that would provide the volumes you need. Compare your existing surface versus your excavation. Analyze the volume surface using two elevation ranges: minimum to -5 and -5 to maximum. You can then generate a dynamic table that reflects volumes for both ranges.
thanks for the assistance. I tried this out and they seemed to work ok, but then the client threw a doozy at me and asked for them between each construction joint which runs north-south through my massive pile of concrete. After discussing the best way to do this with another colleague we have decided that doing it by hand is probably the best alternative, after getting x-sections out of c3d.
Bounded volumes may also be an option. Basically you draw a polyline to define the area, and then the surface to surface volume is calculated only within that.
As a follow on to my previous issue.
I have 2 surfaces which extend past each other. One is rougly bowl shaped running generally east-west, while the other is a slope from south-north.
What I would like to know is if there is an easy way to draw a line where the two surfaces meet.
I was assuming I might be able to use volumes to do this, as on one side there will be cut, and the other would be fill, but I would like something physical I could snap too. Any thoughts?
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