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16 - Non-Horizontal Ground Surface

1.0 Introduction

This tutorial demonstrates the Non-Horizontal Ground Surface option in Settle3. This tutorial will walk you through modeling a non-horizontal ground surface and soil profile. Before proceeding with the tutorial, make sure you’ve gone through Tutorial 01 – Settle3 Quick Start Tutorial so you’re familiar with the product’s basic functions and features. You may also wish to go through the Tutorial 13 - Multiple Boreholes tutorial which provides an introduction to modelling a horizontal ground surface with a non-horizontal soil profile, as this tutorial will follow the general procedures of Tutorial 13.

Topics Covered in this Tutorial:

  • Non-horizontal soil layers
  • Non-horizontal ground surface
  • CPT soil profiling option

Finished Product:

The finished product of this tutorial can be found in the Tutorial 16 Non-Horizontal Ground Surface.s3z file. All tutorial files installed with Settle3 can be accessed by selecting File > Recent Folders > Tutorials Folder from the Settle3 main menu.

2.0 Model

2.1 Project Settings

  1. Select Home > Project Settings project settings (CTRL + J) to open the Project Settings dialog.
  2. In the General tab, make sure the Stress Units are set as Metric, stress as kPa and the Settlement Units are set to Millimeters.
  3. Go to the Soil Profiles tab and turn on the Non-Horizontal Layers option.
  4. Check the Non-Horizontal Ground Surface checkbox, and leave the Surface Interpolation as the default TIN Triangulation option.
    Soil Profiles- Project Settings
  5. Leave the Number of Surface Points at the default value.
  6. Click OK to close the dialog.

2.2 Soil Properties

  1. Select Soils > Define Soil Properties soil properties (CTRL + 8).
  2. Soil Properties Dialog

  3. For Soil Property 1, select the Immediate Settlement tab and check the box for Immediate Settlement.
  4. Enter the below data:
  5. #

    Name

    Unit Weight

    (kN/m3)

    Es

    (kPa)

    Esur

    (kPa)

    1

    Sand Fill

    18

    25000

    25000

  6. Select the Primary Consolidation tab and set the Material Type as Linear.
  7. Enter the following values:
  8. mv

    (m2/kN)

    mvur

    (m2/kN)

    0.0002

    0.0002

  9. Repeat the above steps for the next two soil layers and enter the data below.
  10. #

    Name

    Unit Weight

    (kN/m3)

    Es

    (kPa)

    Esur

    (kPa)

    mv

    (m2/kN)

    mvur

    (m2/kN)

    1

    Sand Fill

    18

    25000

    25000

    0.0002

    0.0002

    2

    Silty Sand

    18

    20000

    20000

    0.0002

    0.0002

    3

    Dense Silty Sand

    19

    25000

    25000

    0.0002

    0.0002

  11. For Soil Property 4, leave the Immediate Settlement box unchecked.
  12. Go to the Primary Consolidation tab and set the Material Type as Non-Linear.
  13. Enter the following values:
  14. #

    Name

    Unit Weight

    (kN/m3)

    Es

    (kPa)

    Esur

    (kPa)

    Cc

    Cr

    e0

    OCR

    4

    Silty Clay

    18

    -

    -

    0.38

    0.01

    1.1

    0.7

  15. Click OK to close the dialog.

2.3 Add Boreholes

  1. Select Soils > Add Borehole add borehole .
  2. The Edit Borehole dialog will open. Click on the Insert Layer Below button three times. The layers will fill in with the correct names automatically.
  3. Edit Borehole Dialog box

  4. Specify the layer thicknesses and Borehole Top Elevation as shown below.
  5. #

    Name

    Thickness

    Top Elevation

    Bottom Elevation

    1

    Sand Fill

    3

    3

    0

    2

    Silty Sand

    5

    0

    -5

    3

    Dense Silty Sand

    10

    -5

    -15

    4

    Silty Clay

    12

    -15

    -27

  6. Click on the add icon to add another borehole. Notice that the first borehole is copied in Borehole 2.
  7. Define the other boreholes using the tables below.
  8. Borehole Name

    Borehole Location

    Borehole Top Elevation

    X

    Y

    Borehole 2

    25

    5

    7

    Borehole 3

    15

    20

    2

    Borehole 4

    35

    25

    1

    Borehole 5

    40

    -5

    7

    Borehole 6

    40

    10

    7

    Thickness

    Material

    Boreholes 2, 5, 6

    Borehole 3

    Borehole 4

    Sand Fill

    5

    4

    4

    Silty Sand

    6

    7

    8

    Dense Silty Sand

    12

    8

    10

    Silty Clay

    7

    11

    8

  9. Click OK to close the dialog.

add boreholes model

3.0 Loads

  1. Select Loads > Circular Load circular load icon (CTRL + 2) to add a circular load.
  2. Define Load dialog

  3. Change the Bottom Elevation to 4m. Keep all other values as default.
  4. Click OK to close the dialog.

You can specify the load location using your mouse to click on the location plan view, or you can type the coordinates into the field in the lower right of the screen. Set the load location as as (40,0).

4.0 Field Point Grids

With the Non-Horizontal Ground Surface Option two field point grids can be defined:

  • Field Point Grid
  • Non-Horizontal Field Points

The Field Point Grid is the standard rectangular field point grid, whereas the Non-Horizontal Field Points Grid is a 3D surface contour for the ground surface.

4.1 Field Point Grids

  1. Select Query > Auto Field Point Grid auto field point grid icon . The Grid Properties dialog will appear.
  2. Keep the default values and click OK to apply the field point grid.
    3d view with field point grid
  3. Use your mouse to move the field point grid up and down. You can do so by either clicking on the 3D view or dragging the arrow up and down the Elevation / Soil Layers control.

As you move the field point grid up, you can see the contours are only shown in areas where there is ground.

To turn off the Field Point Grid:

Uncheck the Field Point Grid checkbox in the right-side View Controls.

View Controls Pane

4.2 Non-Horizontal Field Points

  1. Select Query > Non-Horizontal Surface toggle non horizontal field points grid icon

Results view with non horizontal field points

You should see the Total Settlement Contours along the top surface of the model.

This concludes the Non-Horizontal Ground Surface tutorial; you may now exit the Settle3 program.

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