TAILINGS DEPOSITION MODELLING

TUTORIAL

Embankment Modelling

First Principles

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INTRODUCTION

During this tutorial the User will develop an embankment from first principles. During this tuto-rial we will also:

Calculate model volumes

Merge the embankment model in the base model

Generate a pond

Extract a longitudinal section

Extract cross sections

While working through this tutorial a copy of the Rift TD Users Manual may be useful. The Users manual is installed as part of the Rift TD installation process. Alternatively, it can be downloaded from our download page at www.riftxone.com.

TUTORIAL COMPONENTS

This tutorial comprises:

This instruction set

Rift TD Data Files:

Base Model.rft: The surface on which the embankment is generated

Final Model.rft: The base surface with the embankment

Merge.rft: The embankment merged into the base model

ASCII Data Files:

Embankment String.txt: The ASCII file defining the embankment crest

Survey Data.txt: Topography survey data

BASE TOPOGRAPHY

Base topography has been generated using an ASCII data file. A tutorial outlin-ing initial surface development is avail-able from our download page at www.riftxone.com:

Initial Model SetUp (ASCII Data)

This tutorial provides the Rift TD data file, Base Model.rft, as a starting point. To start the tutorial open the Rift TD data file Base Model.rft included with the tutorial.

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EMBANKMENT DEVELOPME NT

To generate the embankment we will:

Generate strings defining the upstream and downstream embankment crests

Interpolate nodes along the strings

Generate toe point nodes using the strings

Triangulate the nodes to form a new surface

Delete superfluous triangles

DEFINE EMBANKMENT CRESTS

Click

String tool-button or

Edit Strings

Activate graphic add functionality; click

Add Graphic Data Tool-button or

Right click on the DTM Graphic and select Data Add or

Select Data Graphic Data Manipulation Add

Click on the DTM Graphic to add string nodes and define the string

Press Esc when done

Set the string node elevations to the embankment crest ele-

vation

Right click on the Data Grid

Select Set Node Elevations

Enter a Constant Elevation of 1350m

Click Ok

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Add the downstream crest string

Click

Add String Parallel Tool-button or

Strings Add Parallel

The Offset Distance Dialog is displayedenter a value of 5m

On the DTM Graphic:

Click close to a string to select it

Click on the string side to indicate the paral-lel strings location

A parallel string is added to the model

Click Cancel on the Offset Distance Dialog

Interpolate nodes along the string

Click

Interpolate Nodes Tool-button or

Select Strings Interpolate Nodes

Click close to a string (either the upstream or downstream string) to select itthe String Inter-polate Nodes Dialog is presented

Select Surface 2 from the Add Nodes to Sur-face No. Drop Down Box

Enter 30 for the Number of Nodes

Click Ok

Repeat the above procedure to interpolate nodes along the second string

Generate string toe points

Click

Generate Toe Points Tool-button or

Select Strings Toe Points

Click close to a string (either the up-stream or the downstream string) to select itthe StringToe Points Dia-log is presented

Uncheck Consider String Points Below Surface

Select Intersection Surface No. 1 from the drop down box

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Select Surface 2 from the Add Nodes to Surface No. Drop Down Box

Enter 30 for the Number of Nodes

Enter a Slope of 1 in 3.5 Down

Click Ok

Click on the DTM Graphic to indicate the Down side

Toe points are generated and added to Surface No. 2

Repeat the above procedure to generate toe points using the sec-ond string

Triangulate the nodes on Surface No. 2 to form the embankment surface

Activate Surface No. 2 (the new surface to which the nodes were added)

Click

Surface Tool-button or

Edit Nodes

Select Data List No. 2 from the Data List No. Combo box

Triangulate the nodes

Click Triangulate Tool-button or

Select Surface Model Elements Triangulate

Click No when prompted if you should be notified when duplicated nodes are found duplicated nodes are auto-matically deleted

The model is triangulated and the graph-ics updated to show surface

Delete spurious nodes that fall outside the em-bankment boundary

Delete elements cut by a line

Click the Delete Ele-ments Cut by Line Tool-button or

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Select Sur-

face Model Elements Delete Line

The Define Line Dialog is presented

Click on the DTM Graphic to draw a line intersecting elements that are to be deleted

Click the accept button on the Define Line Dialog to accept and delete the elements

Delete remaining spurious elements

Click Delete Single Element Tool-button or

Surface Model Elements Delete Single

Move the cursor over spurious elements on DTM Graphic; ele-ment boundaries are high-lighted

Click on elements that are to be deleted

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VOLUME CALCULATIONS

Two volume calculations modes are available:

Grid Volumes: Volumes are calculated using a User specified rectangular grid

Tin Volumes: Volumes are calculated using model triangles

GRID VOLUMES

Click the

Grid Volumes Tool-button or

Surface Model Volumes Grid Model

The Grid Volumes Dialog is presented

Enter:

A Volume Model of 2

A Base Model of 1

A Grid Spacing of 5

Click Ok

Volumes are calculated and results displayed on the Volumes Dialog

Copy results to the clipboard by clicking the Copy to Clipboard link

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TIN VOLUMES

Click the

Tin Volumes Tool-button or

Surface Model Volumes Tin

The Tin Volumes Dialog is presented

Enter:

A Volume Model of 2

A Base Model of 1

Click Ok

Volumes are calculated and results displayed on the Volumes Dialog

Copy results to the clipboard by clicking the Copy to Clipboard link

MERGING MODELS

In this section we will merge the embankment model into the Base Model. This is necessary to generate a pond in the basin behind the embankment, the focus of the next section of this tutorial.

Click

Model Merge Tool-button or

Surface Model Merge

The Model Merge Dialog is displayed

Enter

Merge All Nodes

Merge Model of 2

Base Model of 1

Click Ok

Model No. 2 is merged into Model No. 1.

POND GENERATION

Click

Pond Wizard Tool-button or

Surface Model Pond Generate Pond

The Pond Data Dialog is displayed

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Click Select Point

Click on the DTM Graphic in the Pond Basin

Click Next

Enter a Maximum Pond Elevation of 1348.50m

Enter a Volume Elevation Interval of 0.5m

Ensure that the View Graph Check box is checked

Click Finish

The pond is generated and the DTM and 3D Graphics updated

The Pond Elevation/Area/Volume curve is presented

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EXTRACT A LONGITUDIN AL SECTION

Define a string along the longitudinal section align-ment

Activate Strings

Click

String tool-button or

Edit Strings

Add a new String

Click on the Add Data List Tool-button

Activate graphic add functionality

Right click on the DTM Graphic and select Data Add or

Select Data Graphic Data Manipulation Add

Click on the DTM Graphic to add string nodes and define the string

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Press Esc when done

Click the String-Longitudinal Section Tool-button or

Select Strings Longitudinal Section

Click close to the string on the DTM Graphic to select it

The Select Model Dialog is presented

Enter the Model No 1 as the model to be used when extracting the section

Click Ok

The longitudinal section is extracted and presented on the Longitudinal Section Form

EXTRACT CROSS SECTIO NS

Define a string along the longitudinal section alignment

Activate Strings

Click

String tool-button or

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Edit Strings

Add a new String

Click on the Add Data List Tool-button

Activate graphic add functionality

Right click on the DTM Graphic and select Data Add or

Select Data Graphic Data Manipulation Add

Click on the DTM Graphic to add string nodes defining the string

Press Esc when done to cancel Data Add functionality

Click the String-Cross Section Tool-button or

Select Strings Cross Section

Click close to the string on the DTM Graphic to select it

The Cross Section Data Dialog is presented

Un-check Add Section Strings to DTM

Un-check Add Segment End Sections

Enter Model No. 1 as the model to be used when extracting the cross sections

Enter a Left Offset of 100m

Enter a Right Offset of 100m

Enter a Cross Section Spacing of 100m

Click Ok

The cross sections are generated and presented on the Cross Section Form

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