Surface Section Volumes

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Introduction

This command allows the user to calculate sectional volumes (average end area or prismoidal) from any String.  The user can adopt the section sampling of the string or pick a Named Section List for the calculation of cross section frequencies.

The volume calculation is based on the creation of polygonal areas and the user can determine how volumes are managed at the mutual extents of the two surfaces.  This command is useful for calculating cross section based volumes for any two surfaces.

Where the two surfaces do not share the same elevation at the mutual extents of the surfaces, and in the absence of any Extension & Resolve controls, the software creates a closed area by drawing a vertical line to match the surfaces at the extents.

Interface

The Section Volumes form is divided into three core parts:

1. Top panel

   • Select the String and sections

   • Select the comparison surfaces

   • Control how volumes are calculated

2. Mid panel

   • This includes a number of columes describing the the areas and volume calculations for cut and fill. 

   • Pick any section to display in the lower panel

3. Lower panel

   • Provides a graphical display of the selected string cross section including the cut/fill area, design codes

   • The user can elect to show cut and fill areas as well as the design calculation lines used for generating the cut/fill areas.

The user is able to review any chaiange location and visually see the areas of cut and filll used to calculate volumes.

Cut and Fill Representation - Sections Tab

Cells describing a cumulative cut area/volume will be displayed with a pink background.

Cells describing a cumulative fill area/volume will be displayed with a green background.

Graphical Display

Graphically, cut ares can be shown with red outline and semi-transparent red infill, while fill areas can be shown with a blue outline and semi-tranparent blue infill.  The design codes will be displayed with coloured circles.

cut and fill areas will be labelled.  Extension and resolve slopes will also be labelled.

 

Calculation Methods - Average End Area or Prismoidal Method

Two section based volume calculations are supported:

• Average End Area: obtain the areas of cut and fill for a section and the next section.  Average the areas and multiply by the distance between.  If curve correction is ticked on, the centroids of the areas left and right of the centreline will be used to calculate the distance between sections.

• Prismoidal method: calculate a mid area and apply the prismoidal formula

 

Details

Upon selecting the command the following form is displayed:

String	Select the string to obtain volumes for
Sections	Select the section spacing.  All Sections selection will use all sampled sections for the string. A Named Sections List can be selected to calculate section volumes.
Design	Select the Design Surface
Base Surface	Select the Base Surface for comparison
Calculation Options	Calculation      Method Select either Average End Area or Prismoidal method    Cut Factor Select a multiplier for cut volume    Fill Factor Select a multiplier for fill volume     Apply Curvature Correction Tick on to use the centroid of each area to calculate the distance between sections Apply Apply the changes
Extension and Resolve Options	[List of Inputs] Inputs: - Start chainage - End chainage - Condition: Cut/Fill - Side: Left/Right selection - Resolve Slope: type in a value (% units) for the slope to use to resolve (match) to surface - Use Current: If ticked on, apply the section subgrade slope in any added width extension for the subgrade - Extension Distance: distance to extend the subgrade - Extension Slope: type in a value (% units) to apply to a width/distance extension of the subgrade.  Only used if Use Current is unticked. Add Add an Extension & Resolve entry Delete Delete anentry Save Save the inputs to file Open Load and saved inputs Apply Apply the changes
Total Cut Volume	Displays total cut for the selected string
Total Fill Volume	Displays total fill for the selected string
Excel Export	Generates an Excel (.xls) file and opend for review
Recalculate	Recalculate the string sections, in case they have been changed while this form was open
[Graphic Display]	Displays the sections and cut/fill areas.
VE	Picklist to set the vertical exaggeration
Show Polygons	Tick on to show the cut/fill polygon areas.