Downstream Tailing Dam in a Landfill

[gabriel_feyh]

Hi guys, I'm working on the stability of a landfill slope and I need to build an earth dyke downstream to contain it. I want to build it at three different heights: 5 m, 10 m and 15 m. I had the idea of making a rectangle, as shown in the image, and turning it into a featuring line so that I could then use the grading with surface tool. However, I'm having trouble making the dam together with the surface of the land where the waste has already been deposited and I'm also having the problem of generating the surface and it appearing with the triangulation inverted. I would like some suggestions or what I can do to fix this. Thanks!

[ecfernandez · Accepted solution]

Hi @gabriel_feyh, welcome to the Autodesk Civil 3D forums.  

"making the dam together with the surface of the land where the waste has already been deposited"

I understood from this that you need to know how to make the terrain surface and the grading surface just one. Is that right? If so, create a new surface. This will be a placeholder for two surfaces (your Existing Ground and your Grading Finished Surface). Then, go to edit, paste and paste the terrain first and then the grading surface. You'll notice how Civil 3D will combine both surfaces.

"I'm also having the problem of generating the surface and it appearing with the triangulation inverted"

I did not understand this. What do you mean by inverted? What is the surface supposed to look like? 

I hope this helps resolve part of your problem. Best regards!

[gabriel_feyh]

Hi @ecfernandez, I'd like to thank you for your solution to my problem of joining the two surfaces. Perhaps I didn't express myself very well regarding the inverted triangulation, but I was referring to those two holes at the ends of my surface generated with grading. In the images I sent, you can see these defects, but I ended up going through the file and discovering that these defects were due to the intersection of two different feature lines, generating a conflict.

[ecfernandez]

Hi @gabriel_fey, thanks for your explanation, now I understand what you meant. I’m glad you found useful my contribution and that you figured out the second part of that problem.

Best regards!

[gabriel_feyh]

Hi @ecfernandez, I just have one more question. As I now have the two surfaces, how do I fill in the empty surface in the attached image?

[ecfernandez · Accepted solution]

Hi @gabriel_feyh, I can think of two options to fill that portion of land:

 1. Create a new site and then create feature lines that belong to this new site along this portion I present in yellow in the following image. After that, create a grading to surface with that new feature line and a grading infill. You'll have an independent surface for the new grading you'll need to add to the composite surface you already created.

2. Erase the pink-colored portion of your current grading, and modify the feature line layout to have something I suggest in yellow. Once you do it, generate the grading again and create the infill (the new grading will follow a similar geometry to what I try to indicate in purple color). The surface will be updated, but you must rebuild your composite surface.