Using Geological Data for Rock Quantities: Part III

So we last left our glorious sanitary sewer projects with a pipe trench corridor created. Now for some volumes.

In profile, I've hatched the soil area as green, the softer rock as yellow and the hard rock as red. If at all possible, I'd like to minimize going through the red. (Do you like that hatching? Me too! More on that tomorrow!)

There are many ways to get volume calculations from this exercise. First, I will make a surface from the trench corridor, the simply use a quick volume (Surfaces>Utilities>Volumes in Civil 3D 2009) to compare the different surfaces.

This isn't the most elegant solution, but it is a good way to get started. I will have to subtract the Rock 7200 surface cut numbers from the Rock 4000 numbers since they overlap.

I'd like to show you how to do this with material tables and cross section views, which is a little more robust and also provides nice visuals.

Comments

[Matthew Anderson]

One could accomplish nearly the same thing using materials in cross-sections and allow Civil 3d to do the math.

Thats how I do my floodplain cut and fill. I need to blog about that at sometime.

[Dana Probert]

Yes. That is the subject of my next post.