K-Value analysis on survey

[sofia.peixotoQPFMQ]

Hi everyone,

I would like to know if there is a way to evaluate the K-value only by topographical survey.

I know that it is possible to define it through an alignment and consequently the soil profile with the road profile defintion.

The purpose here will be a global analysis only through the topographic survey in order to assess whether or not there is a need to adapt the natural terrain to vehicle mobility conditions.

Thank you for your help.

Best Regards,

Sofia

[ecfernandez]

Hi @sofia.peixotoQPFMQ, I hope you're doing fine. You can create a layout profile based on your existing surface profile that resembles the terrain. Then you can get the analysis from it. You can use the "Best fit profile" tool to save time when doing that task.

Then a window will prompt and select

I hope this helps. Best regards!

[sofia.peixotoQPFMQ]

Hi @ecfernandez 

Hope you are well.

Thank you so much for your quick reply.

But here the intention would be to have a general analysis without having to resort to alignment. That is, for example, create some kind of contour in the topographic survey where you can see the critical areas of K values above the recommended ones.

Do you think there is such a possibility?

Best Regards,

Sofia

[ecfernandez]

Hi @sofia.peixotoQPFMQ, 

Sorry if I misunderstood. What I got is that you want to know the K (Rate of vertical curvature) value of an existing road whose existing surface is now in Civil 3D? right?

If that is correct, remember that K=L/A, being L the vertical curve length and A the algebraic difference. Therefore, the easy path would be having an alignment and a layout profile that resemble the existing road in which the analysis can be supported. It doesn't need to be perfect, but similar.

Otherwise, the only option I can imagine so far is identifying the vertical curves somehow one by one, running a slope analysis, and measuring the curve length manually to estimate the value. 

If I can think of something else, I'll let you know. 

Best regards!

[neilyj666]

@sofia.peixotoQPFMQ I would do what @ecfernandez has suggested as the TIN surface doesn’t have curves natively as it is built from triangles. You can draw in a curve manually to get a good approximation.