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# Analyse (DTM)

Click the ‘Calculate’ button (DTM) to compute the earthworks volume calculation. Go to Cut/Fill>> DTM>> Calculate

Digital Terrain Model (DTM) is a digital representation of the continuous surface of ground by field survey points or data points with known X,Y,Z coordinates.

# Auto Balancing#

Auto Balancing will balance all the platforms height (platforms proposed level) to minimize the amount of cut/fill volume, used to optimize the cost of import/export.

Auto balancing works if only there is a boundary because auto-balancing must happen within the boundary. To create a boundary, refer to Chapter 6.

The auto-balancing is only applied to the DTM method. Click on Calculate in DTM, and tick the box as shown below.

All the platform proposed levels will be adjusted accordingly, unless you fix the height. To fix the height, click on “Platform > Spread Input > Fix Height and change to Yes”.

To define the balancing earthworks volume, insert the Desired Cut/Fill in Boundary spread input section.

# Auto Slopes & Retaining Walls#

Software provides sloping modelling and retaining wall modelling at all the platform’s edges.

In order to allow the platform to have a slope or retaining wall, platform edges need to be assigned with a slope direction either ‘None, In, or Out’.

Select none if it does not require any slope.

## Auto Slopes (Slope In or Slope Out) #

Depending on the sloping direction, the starting and stopping point of

auto-slope will differ:

Slope Out:

Note: The starting point of a slope is always from the platform edge level

Slope In:

## Retaining Walls#

User can set retaining wall shape, colour, and other properties based on height from Platform Level to Existing Ground Level/Autoslope level

Wall shape dimensions can be modified by selecting the associated wall shape and modifying its values under Parameter>>Earthwork>>Retaining Structures>>Wall Shape.

Walls can be shown in cut/fill contour and cut sections

## Retaining Walls & Slope Combination#

### Retaining Structure at Boundary#

When a platform edge has been assigned both retaining structure and autoslope, a retaining structure will only be created at the end of the autoslope for the following situations below only for slope out.

Set the Slope Direction “Out” and tick “Retaining Structure”

Create a boundary. A retaining structure will be denoted at the boundary once the slope stops reaching the boundary

A retaining structure is created at the edge of the slope and stops at the boundary

### Retaining Structure (straight wall)#

To assign a retaining structure at the platform, change the slope direction to “None” and tick the retaining structure.

Set “None” to Slope Direction and tick Retaining Structure

Generate the slope and see cut section

The retaining structure is indicated in the Keyplan and Cut Section

### Relative Height (length of the retaining structure) #

• Slope after retaining wall start at the total of platform + height
• Eg: platform elevation (10) + Relative height (5) = retaining wall start at 15m
• Both of the sides of the retaining wall can be assigned with height

5 m height and 3 m height for the sides. If the height of both of the sides are equal., insert the same value

The corner number is shown once the platform is clicked.

See Cut Section

Slope continues 5 meter above the platform elevation

### Absolute height (Elevation where the slope starts after retaining structures)  #

Eg: Platform height is assigned to be 20 m. The elevation of the slope starts at 25 m, therefore plug in 25 m in the absolute height.

Both of the sides can be assigned with height. If the height of the retaining are the same for both sides, insert the same value

The corner number is shown once the platform is clicked.

See Cut Section

# As-Built Calculations#

As built calculations can be carried out by analysis using two survey point groups. Steps to create a survey point group can be referred to under section 1.2.2. Steps to carry out as-built calculations are shown below.

Firstly, survey points for existing ground level is imported (as ‘Survey Points 1’ survey point group in example below)

Survey points for as-built is imported (as ‘Survey Point 2’ survey point group in example below)

After importing both survey point surfaces, go to Cut/Fill and then to the Surface tab to change the comparison surface by clicking the drop down button. Make sure ‘Base’ shall be the existing ground level and ‘Comparison’ shall be the as-built level.

After analysis is completed, coverage area of ‘Contour’ is the area where base comparison surfaces overlapped, earthworks volumes computation is based on the coverage area of cut/fill contour:

3D view of the surface can be generate by click the ‘3D’ button in the Main windows. Make sure the desired surface type is selected in the terrain tab on the RHS panel. For example, this is the 3D view of Survey Points 1.

To change the surface type, use the Active Survey drop down menu. For example, this is the 3D view of Survey Points 2 within the as-built boundary.