Computing volumes quandary

[neilyj666]

I have a proposed road (provided by a third party) and I'm trying to get the volume shown in the sketch below. I have 3d polylines and an EGL but can't see an easy way of deriving the point I've identified. 

The only way I can see is to take the EGL at the Land Made Available boundary and offset it at 1V:3H so that it is well above the proposed road surface and create a temp surface using the EGL at the the LMA and the offset featureline. Then create a grading along EVP1 to intersect with this new temp surface.

Any one got any better ideas??

Thanks

Neil

[fcernst]

LinkSlopesBetweenPoints

[lucy.kuhns · Accepted solution]

If you have 3D polylines representing the edge of design at elevation and the land availble limits as it rests on the surface then you can use a temporary "omit" link which will make a point that you can use as an outside connection and work the side slope inwards - use an elevation target as the edge of design (and the width will calculate automatically). Once you have that link the last link will work back to target the edge of design, and the width will automatically flex to match.

[neilyj666]

Not tried that as I wanted to avoid the hassle of having to create the relevant corridor objects as the fill areas are non contiguous.

I abandoned the grading idea after several lockups and am offsetting from EVP1 to create another temp surface and then finding the minimum dist between....

[lucy.kuhns]

Guess I didn't understand your design. I ran a dummy corridor to establish the 3Dpolys and it worked out pretty clearly:

[neilyj666]

Yes that looks pretty good - probably a lot quicker than the method I'm now attempting and also doesn't use grading objects.

[fcernst]

Here's a quick mock up of my suggestion, with the Material analysis.

[neilyj666]

Thanks for this - I'm looking at a corridor/assemlby method for solving this now...:)

[sboon]

If the fill areas are not contiguous then you could use conditional subs to test for the presence of the 3d polyline, and have the corridor react accordingly.

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

[fcernst]

If it's just the Volume you're after you can quickly apply Gaps.

[Joe-Bouza]

Hi Lucy

I miss your web cast

[lucy.kuhns]

Thank you Joe - that seems like eons ago, ohh those early days of C3D. It is a whole new world now with the advent of InfraWorks - here we go again with the learning curve!

[neilyj666]

Good call on the Conditional Horizontal Target - it worked very well (not perfect but easy to sort the anomalies)

[neilyj666]

This worked very well - I tend to forget how powerful the targeting options are for corridors

[fcernst]

I'm not following the other solution. You don't need any 3D polylines to do this, nor create a dummy corridor.

How are you getting the elevation below. I thought it was unknown. My solution computes it as the intersection of the 3:1 slope, then just guessed 2% coming out from the road since you didn't specify, but you could use anything that will intersect with the 3:1. Can you show your section and assembly?

[neilyj666]

I was having difficulty folowing your method - not sure about the marked point or how the targets are set?

In the screendump below I have a Horiziontal target conditional sub

LinkOffsetandElevationtoLMA targets the Level of the LMA, LinkslopetoTopFill targets the elevation of the FRL earthworks at a 1:3 slope from the LMA and the LinkOffsetandElevationTietoFRL targets the position and elevation of the FRL Earthworks

[fcernst]

I'm doing a LinkOffsetOnSurface out to the LMA boundary, then LinkSlopesBetweenPoints back to the Marked Point I put at the edge of the road.

So you do know the elevation or location of that point?

What does FRL stand for again?

[neilyj666]

FRL = Finished Road Level

I don't know the elevation of the indicated point as it is determined from the elevation target of the FRL earthworks 3D polyline the disadvantage is that the link is pretty flat whereas your method allows for a fall away from the road.

I'll try it again when I have some time