Corridor sudden width change - surface not behaving

[Anonymous]

I have a small access road that terminates within a 75' X 75' fenced-in area. I'm attempting to grade this site by using two different assemblies.

For the road outside the fenced area, the assy consists of a lane (LaneOutsideSuperLayerVaryingWidth), a ditch, and DaylightGeneral sub-assemblies. For the area inside the fence, I've added a BasicShoulder to the edge of the lane sub-assy to grade everything extending from EOP to the fence. See below for a pic of the two assemblies.

The corridor looks pretty good, but when you look at the corridor surface, the area inside the fence isn't getting fully graded. You can see the contours denoted by the red arrows that are creeping inside the fenced area (see below). Can anyone shed some light on how I can get the fenced area to grade flat as intended? Maybe there's another daylight sub-assy that would work better?

I've messed around with doing this using two separate corridors instead of two regions within the same corridor, and that does seem to work better, but then you have the added complexity of another surface to deal with. I would prefer to do it all with a single corridor.

[Civil3DReminders_com · Accepted solution]

Where the bad contours are you will want to add a region that only does the roadway portion. Then create an alignment that goes along that roadway area, along the fence to the hinge point. Then add that as a baseline to the corridor and it should use the daylight link you are using on the full section. This will allow you to control the transition between the narrow section and the wide area. 

[Anonymous]

Thank you for the reply. I'm a corridor newbie, so please bear with me.

"you will want to add a region that only does the roadway portion."

Done. (I'm assuming this meant add a region using the lane subassy and no ditch or daylight.)

"Then create an alignment that goes along that roadway area, along the fence to the hinge point."

You've lost me here. Here's what I have so far (see below). Not sure where to start the alignment, or where to put it - center line of road, EOP? Also, what hinge pt are you referring too? Where the fenced in region and newly added region meet?

"Then add that as a baseline to the corridor and it should use the daylight link you are using on the full section."

Maybe this part will be more clear once I complete the step above.

[Civil3DReminders_com · Accepted solution]

I'd create the alignment where the yellow line is. I'd probably put in some curves at the corner to get some good looking daylights.

The other option is to create a feature line where the yellow lines are and then use gradings to get to the surface. With grading's it will do the corner cleanup so you wouldn't have to use radii. 

Make sure to extract a surface from the grading and then delete the grading. I don't suggest having gradings in a saved and closed drawing. 

[Civil3DReminders_com]

Also note, you probably need to make some changes to your design (or how you model it). There is way too much fill to geometrically work for the transition between the big area and the roadway daylights. There are going to be bowties for days and days and days.

[Anonymous]

I added the alignment as a baseline to the corridor, but I'm unsure what step to take next. Something needs to be targeted to it?

In your initial post you mentioned "add that as a baseline to the corridor and it should use the daylight link you are using on the full section. I'm not sure how to accomplish that. Here's what my target mapping for the fenced region looks like.

[Civil3DReminders_com]

Create an assembly with a daylight subassembly and then assign the surface target in the corridor for that region.

[Anonymous]

Sorry - my brain is not at full operating temp this morning obviously. Could you elaborate?

I already have a daylight sub assembly in the large fenced region. The daylight is targeted to the existing ground surface. The region just to the east of the fence uses an assembly that only has lane sub assemblies. Is this what I'm supposed to add the daylight sub assembly to?? 

I guess what I'm not understanding is what adding that extra alignment as a baseline has to do with anything. What purpose is it serving and what needs to be tied to that?

[Civil3DReminders_com]

Create a profile for the alignment, build the corridor and post a picture of the results. If you don't want to use the entire length of the alignment that is fine by me, create two regions at the transition areas, the areas you are trying to fix.

[Anonymous]

Ok - now I think I'm grasping what the purpose of the baseline is. I will use it to wrap my ditch and daylight around the fenced in area. I deleted the ditch and daylight sub assemblies from the fenced corridor region and created a new region along my baseline using an assembly consisting of just ditch and daylight.

Making some progress - surface is broken now though due to I assume the bow ties?

[Civil3DReminders_com]

Yes, the bowties are the issue. The top bowtie could probably be fixed by a larger radius.

The bowties to the south will be harder to fix. Unless you need dirt elsewhere on the site I'd raise up this area to get rid of the large cuts. If I was to keep the elevations I'd extend the large area alignment to the road going to the south and then put a curve going to the south that would tie into the roadway. This would fill in the area with the bowtie, but provide a nice transition. 

[Anonymous]

Much appreciated Civil3DReminders.

The elevations need to stay put for the most part, but I may grade the hills down first, and then use that surface on which to build my corridor. The berms in the existing ground surface contains demolition debris which has to be removed so it all has to be taken out anyway. Or, I may experiment with removing the daylight sub assembly and try grading to surface using a feature line extracted from the outermost edge of the ditch.