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Ground Surface

This tutorial will demonstrate the Add Ground Surface function in UnWedge. A ground surface can either be drawn within UnWedge or it can be imported as a DXF file. We will look at both options.

Topics Covered in this Tutorial:

  • Adding a Ground Surface
  • Importing a DXF Ground Surface
  • Moving a Ground Surface

Finished Product:

The finished tutorial can be found in the Tutorial 10 Adding a Ground Surface.weg5 file located in the Examples > Tutorials folder in your UnWedge installation folder.

1.0 Model

If you have not already done so, run the UnWedge program by double-clicking on the UnWedge icon in your installation folder. Or from the Start Menu, select Programs > Rocscience > UnWedge. If the UnWedge application window is not already maximized, maximize it now so that the full screen is available for viewing the model.

For this tutorial we will start by reading in the file Tutorial 02 Scaling Wedges_initial.weg5, which you should find in the Examples > Tutorials folder in your UnWedge installation folder and open.

1.1 PROJECT SETTINGS

  1. Select Project Settings Project Settings Icon from the toolbar or the Analysis menu.
  2. Ensure the Units = Metric, stress as MPa.
  3. Change the Analysis Type = Probabilistic.
    Project Settings Dialog
  4. Select OK.

1.2 INPUT DATA

  1. Select Input Data Input Data Icon from the toolbar or the Analysis menu.
  2. Select the Joint Orientations tab.
  3. Change Joint 1 Dip = 80, and Joint 3 Dip = 85.
    Input Data Dialog - Joint Orientations Tab
  4. Select OK.

3D Wedge Model View

2.0 Adding a Ground Surface

  1. Switch to the Perimeter Support Designer Perimeter Support Designer Icon view.
  2. Select Boundaries > Add Ground Surface Add Ground Surface Icon.
  3. Enter the following coordinates in the prompt line at the bottom right of the screen. Press ENTER at the end of each line to enter each coordinate pair:
  4. Enter vertex [t=table,a=arc,esc=cancel]: 25, 65

    Enter vertex [t=table,a=arc,esc=cancel]: 70, 65

  5. Press ENTER again to finalize the ground surface.
  6. Your screen should look as follows:

    Perimeter Support Designer Model View

    We can now view the Deterministic results of this geometry.

  7. Switch to the 3D Wedge View 3D Wedge Icon to see how a ground surface appears in the 3D Wedge View.
  8. Now examine the Wedge Info panel in the Sidebar.

Below, you can see a side-by-side comparison of the resulting changes.

NOTE: If you do not see the desired information in the Wedge Info panel, click the Filter List button and select the data shown below.

3D Wedge Model View

As expected, the Weight and Apex Height of the Roof wedge have decreased. Additionally, the Required Support Pressure has decreased, due to the lower self-weight of the wedge. All other values have remained the same.

NOTE: Instead of a Ground Surface, you can choose to add a Truncation Surface instead. Only one surface can be present at a time. The difference between a Ground Surface and a Truncation Surface is that supports (bolts) are not to pass through a Ground Surface but are allowed through a Truncation Surface.

3.0 Importing a Ground Surface (DXF)

We will now import a Ground Surface from a DXF file.

  1. Switch back to the Perimeter Support Designer Perimeter Support Designer Icon view.
  2. Right-click on the Ground Surface in the model and select Delete Ground Surface Delete Ground Surface Icon from the popup menu.
  3. Select File > Import > Import DXF DXF icon.
  4. Open Tutorial 10 Ground Surface.dxf.
    Tutorial 10 Ground Surface Import Screen
  5. Select OK.
  6. The ground surface should appear on your screen.

    Perimeter Support Designer Model View

  7. Right-click on the Ground Surface, and select Move Ground Surface Move Surface Icon.
  8. Click on the left-most vertex of the Ground Surface.
  9. Enter the following coordinates in the prompt line at the bottom right of the screen: 7, 71.
  10. Switch to the 3D Wedge View 3D Wedge Icon.

The 3D Wedge View should look as follows:

3D Wedge Model View

This concludes the tutorial. You are now ready for the next tutorial, Tutorial 11 - Advanced Joint Combination Analysis in UnWedge.

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