<< Click to Display Table of Contents >> Navigation:  Ground Modelling > Embankments

Purpose

To "look up and down" at right angles from a 3D Polyline to calculate and draw the interface with a ground model. The 3D Polyline may represent such features as the back of footpath string from menu item Design, Strings, Draw, the edge of a sports pitch, edge of car park, footprint, base of a bund or edge of extraction etc. Typically embankments are calculated from a design feature to the existing or survey model but for some design sequences a "virtual model" is used representing a water surface or base of pond for example (see menu item Ground Modelling, Create Model, Uniform surface).

 

 

Operation

Select the model.

 

 

Enter settings in the dialogue, pick the 3D Polyline and pick a point located approximately at right angles from the location where the Polyline was picked to define which side of the Polyline the embankment is to be calculated.

 

Settings

Offset interval      

Enter chainage interval along the 3D Polyline to locate regular offset locations (every 2.5 or 5.0 are typical).

 

Cut: and Fill:      

Enter the gradients.

 

Up and Down, Up only, Down only

Up and Down is the option for typical use – alternatives will look up or down only.

 

Chainages  

The range will be from 0.000 to the end for typical use (note that chainage does not directly relate to a horizontal alignment).

 

Max angle around vertices

Controls angular resolution when Offsets at vertices is "on".  

 

Reference 2D Polyline for chainages

When "on" the cross sections chainages in the Section file will be assigned by an adjacent 2D centreline.  

 

Apply benching

Creates "benches" at every Height intervals of Width wide

 

 

Outputs

Write Report file

Not required for typical use – lists chainages and co-ordinates of all offsets.  

 

Offsets at vertices  

"On" to calculate embankments at every 3D Polyline vertex in addition to the regular intervals. This option should by "on" to define embankments at corners of car parks or sports pitches etc. but should be "off" for Design Strings or other linear features such as in bund design.

 

3D Polylines    

Set "on" for typical use to draw interfaces and offsets as 3D Polylines.

 

3D Faces    

Only required for 3D views using hide and render etc.

 

Write a Section file

Creates a cross section file of the embankments. See also "Reference 2D Polyline for chainages" above

 

Layers and Colours    

Dialogue for control of cut and fill output layers.