By defining boundary(s) for the development project, earthworks volume can be calculated based on the zone.
Boundary Input #
Click the ‘Boundary’ icon to start boundary input. Click once on the application ‘Input’ screen to activate snapping, trace the shape to input the boundary. All boundary inputs have to be closed polygon and cannot overlap each other or itself.
Boundary Editing #
Boundaries can be easily edited by using ‘Add/Remove Vertex’ and ‘Move Corner’.
Add/Remove Vertex #
Click the both buttons ‘Boundary’ & ‘Add/Remove Vertex’ and select the particular boundary.
To add vertex:
Click once at the edge of the selected boundary to activate the add/remove vertex operation, and click again to add/locate the vertex. (If adding vertex fail message is pop out, kindly go to Object Snap Setting, ticked ‘Nearest’ option and re-do the adding vertex operation).
To remove vertex:
Double click the particular vertex to remove the vertex.
Move Corner #
Click the both buttons ‘Boundary’ & ‘Move Corner’ and select the particular boundary. Click on a corner of the boundary and click again to locate the corner’s new location.
Boundary Properties #
Users can view boundaries properties by clicking the both button ‘Boundary’ & ‘Spread Input’.
Mark #
By default, boundaries are named as Boundary 1, Boundary 2 …etc. Users can give a specific name to their project boundary by double click the particular cell and edit it.
Desired Cut/Fill #
The earthwork balance for a defined boundary after Auto-Balancing analysis is done. A negative value indicates cut while a positive value indicates fill.
Topsoil Depth #
The total depth of the soil needs to be scrubbed out before earthwork activities are started. Users can opt to remove the topsoil ‘Within Boundary’ and ‘Within Platform Only’.
| Within Boundary: | Removal of topsoil for all area in the boundary |
| Within Platform: | Removal of topsoil is only for all platform area and slope area that is within the boundary created. |
Option > Project Parameters > Earthworks > Analysis
Users can input topsoil depth in boundary properties using both buttons ‘Boundary’ and ‘Spread Input’ or at the RHS Properties Tab.
Topsoil layer can be observed by users at the Cut Section generated as below;
Within Boundary
Within Platform Only
Material #
In earthwork design, the shrinkage and swelling factors are utilized to account for any alterations in the volume of soil. It is crucial to incorporate these factors into the earthwork material computation to obtain accurate estimation.
Swell Factor #
It refers to the increase in the volume of the soil, going from in situ state to a looser volumetric state, when the excavated material is returned to the construction site.
The swell factor is per boundary basis with a default value of 1 and this value can be changed by the user to suit the project.
Earthwork > Boundary > Spread Input > Material
Users should refer to the Expended Cut under the computation report as per below.
DTM Method #
$$\begin{gather*} Expanded\;cut=\left(Bank\;Cut\;+\;Slope\;Out\;Cut\;+\;Slope\;In\;Cut\right)\times Swell\;Factor \\ =\left(212952.98+125663.36+0\right) \\ =507924.51m^3 \end{gather*} $$
Grid Method #
$$ \begin{gather*} Expanded\;cut=Normal\;Layer\;Bank\;Cut\times Swell\;Factor \\ =338984.07\times1.5 \\ =508476.11m^3 \end{gather*} $$
End Area Method #
Shrink Factor #
It is a factor that pertains to the reduction in volume of the soil, going from a loose state to a compacted state, during the earthwork stage of a construction.
The shrink factor is also per boundary basis with a default value of 1 and this value can be changed by the user to suit the project.
Earthwork > Boundary > Spread Input > Material
In the summary report for each of the earthwork computation methods, users will encounter a figure called ‘Volume Needed Before Compacted Fill’. This represents the amount of fill material that is required to achieve the desired earthwork levels.
Volume Needed before compacted fill = bank fill / shrink factor
DTM Method #
From the report, to obtain the Volume After compaction;
$$\begin{gather*} =Volume\;Needed\;Before\;Compacted\;Fill\;x\;Shrink\;Factor \\ =38910.32\times2 \\ =77820.64\;m^3 \end{gather*}$$
The Volume After Compaction should be equivalent to the total amount of fill material required as per below;
$$\begin{gather*} Total\;Fill\;=Bank\;Fill\;+\;Slope\;Out\;Fill\;+\;Slope\;In\;Fill \\ =48151.03\;+29669.6+0 \\ =77820.63\;m^3 \end{gather*}$$
∴ Volume After Compaction = Total Fill required
Grid Method #
From the report, to obtain the Volume After compaction;
$$\begin{gather*} =Volume\;Needed\;Before\;Compacted\;Fill\;\times Shrink\;Factor \\ =38636.30\times2 \\ =77272.60\;m^3 \end{gather*} $$
For the Grid Method, the result will be divided into outside boundaries and inside boundaries. Hence,
Outside Boundary
$$\begin{gather*} Volume\;Needed\;before\;compacted\;fill\;=bank\;fill/shrink\;factor \\ =1488.43/1.00 \\ =1488.43\;m^3 \end{gather*} $$
Inside Boundary
$$\begin{gather*} Volume\;Needed\;Before\;Compacted\;Fill\;=\;bank\;fill/\;shrink\;factor \\ =\;74295.74/2.00 \\ =\;37147.87 \end{gather*} $$
$$\begin{gather*} \therefore Total\;volume\;Needed\;before\;compaction\;=\;Outside\;Boundary\;+Inside\;Boundary \\ =1488.43+37147.87 \\ =38636.30\;m^3 \end{gather*} $$
End Area Method #
From the report, to obtain the Volume After compaction;
$$\begin{gather*} =Volume\;Needed\;Before\;Compacted\;Fill\;\times\;shrink\;factor \\ =38716.95\times2 \\ =77433.90\;m^3 \end{gather*}$$
