should any one guide me how to start pit excavtion on a contour surface
Can you give a bit more information - are you looking at a small borrow pit or a large open pit mine?
There are two basic ways:
1 Using gradings: You can either start at the existing ground and work down or start at the pit base and work up, both of which will need a feature line either draped over existing ground or set to pit base level and you can then create a grading to the required horizon.
2. Using a corridor - this has some advantages in that you can target various stratum horizons and specify different slope criteria and is arguably more stable than using gradings but it has difficulty modelling sharp corners.
If you can provide more detail about what information you have and what you are trying to achieve I can advise further.
neilyj (No connection with Autodesk other than using the products in the real world)
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I am trying to excavate a power house
and want to under stand from where to start
Wow...thats some excavation - I'm assuming it is in feet rather than metres; not that it makes a difference to the methodology? I assume you have some knowledge of Civil as the follwoing is not a step by step method
It looks like the existing ground coverage won't be big enough to show the proposed top of excavation so you will need to extend the existing ground coverage.
First thing is to build and existing surface from the contours (which is explained in help and http://civil3dplus.wordpress.com/2011/08/13/adding-contours-to-a-surface-youre-doing-it-wrong/ but you will need to extend as mentioned.
Then I would create feature lines that define the bottom of the Class E concrete and the bottom of the 4:1 slope and use offsets to build a series of featurelines defining the excavation to above existing ground.
Create a surface from these features with an appropriate supplementing/weeding factor and use minimum distance between surfaces to derive a trimming line which can be added in as an Outer boundary
You can use gradings exclusively for the main pit excavation but they can be a bit buggy and have a tendency to crash the drawing.
neilyj (No connection with Autodesk other than using the products in the real world)
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You can also just use 2D polylines with an assigned elevation....
neilyj (No connection with Autodesk other than using the products in the real world)
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neilyj (No connection with Autodesk other than using the products in the real world)
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