Gap in corridor

[teblack]

I am creating a drive corridor. The alignment has no P.I.'s. I am using feature lines to control the edge of drive and shoulder break. There are no gaps in the surface which I am using as a target. For some reason I keep getting a gap in the corridor surface as shown in the attached view. Any ideas?

[sboon]

Is it actually a gap in the corridor?  It looks more like one station is not daylighting correctly.  Try looking at the corridor in the view/editor and stepping through the sections in that area.

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

[teblack]

Poor choice of words on my part. You are correct, it is not daylighting on one side. I can't find any reason why. Do you have any ideas?

[sboon]

Any error messages on corridor rebuild?

Maybe a bad featureline elevation on that side?

[teblack]

No, feature line elevations are correct. I have this problem on some drives, but not all. The problem is always on the right. It's not the assembly or it would show up in all the drives.

[alderliesteng]

This is a long shot but is there a manual outer boundary applied to the design surface?

[teblack]

No. I used corridor extents as outer boundary.

[Jeff_M]

Any possibility of posting the dwg file?

[GTVic]

Does the feature line contain a spiral? Maybe try straightening it out for a test.

[sboon]

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@GTVic wrote:

Does the feature line contain a spiral?

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I'm pretty sure that a feature line cannot contain a spiral.

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

[Anonymous]

Hi,
you can create sample line on the gap and the see in the section what is the problem.

[teblack]

I can't post the drawing. It is over 51Mb.

If you look at the corridor in section editor the slope stops before it reaches the target surface.

I created a sample line and cross section at the spot in question. The corridor section matched into existing just as it should but the surface stopped short, same as section editor. Overhang correction didn't help.

[sboon]

Is there a region boundary at that station?

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

[kcobabe]

I often find that viewing your corridor in 3D will often find the reason why you corridor is not targetting correctly.  I would not do this with the entire corridor though.  Shut off all regions you don't need to see and the switch to 3D.

Kind of looks like one corridor feature line is hitting the other corridors feture line which is messing up you intitial starting point for your daylight.

[doni49]

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@teblack wrote:

I can't post the drawing. It is over 51Mb.

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There are ways to make it smaller so that you can post it.  First copy your file to an alternate location and then in that copy:

Delete everything that is not used for either the alignment, assembly, corridor, profile or surface definition.  That will likely make it considerably smaller.

[GTVic]

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@sboon wrote:

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@GTVic wrote:

Does the feature line contain a spiral?

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I'm pretty sure that a feature line cannot contain a spiral.

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

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Sorry, feature line created from an alignment that had a spiral. Then you end up with tesselation and sometimes if the software needs to do an intercect at 90° then it can have trouble with the angles. I see that problem with software where it doesn't get an expected intercect so it snaps back to the original object at zero offset. That is what I see on the image is a possible failed intersection along a curved section.

[teblack]

The entire drive is one region. Viewing the corridor in 3D shows it with the piece missing. The surface used as a target has no voids which might cause this problem. I haven't found anything yet which helps. I will save the drawing and remove all unnecessary information to see if I can post it later today.

Thanks for all your suggestions so far.