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22 - Section Creator

In Settle3, there are three ways in which you can define the soil profile layout - horizontal, non-horizontal, and extruded section layer. For the extruded section layer, you can use the Section Creator which allows you to create a 2D soil profile with boreholes, which is then extruded in the perpendicular direction of the section defined in the 2D plan view. In this tutorial, we will show how to use this feature, along with what you get after you have completed creating your soil profile in the Section Creator.

Topics Covered in this Tutorial:

  • Extruded section layer
  • Section creator
  • Boreholes

Finished file:

The initial file and the finished file can be found in the tutorial folder Tutorial 22 - Section creator. All tutorial files installed with Settle3 can be accessed by selecting File > Recent Folders > Tutorials Folder from the Settle3 main menu.

1.0 Starting file

The starting file can be found in the tutorial folder Tutorial 22 - Section creator_initial.s3z. This file contains soil properties and boreholes. We will use the boreholes to create a 2D section soil profile with the Section Creator feature.

2.0 Model

2.1 PROJECT SETTINGS

  1. Select Analysis > Project Settings Project settings icon to open the Project Settings dialog.
  2. In the General tab, make sure the Time-Dependent analysis option is selected.
    General tab - Project Settings
  3. Select Stages. Make sure you see 9 stages with the time shown below.
  4. #

    Time (days)

    Name
    10Stage 1
    2500Stage 2
    31000Stage3
    41500Stage 4
    51600Stage 5 - install side
    61630Stage 6 - slab
    71690Stage 7
    85000Stage 8
    97000Stage 9

    Project Settings stages dialog

  5. In the Soil Profiles tab, select Extruded section layers option.
  6. Select the Groundwater tab. Select the Groundwater Analysis and keep the default values.
  7. Click OK to exit the dialog.

2.2 SOIL PROPERTIES

The initial starting file already has set up the soil properties defined. You can check the soil properties set up in the model using the Soil Properties dialog.

  1. Select Soils > Soil Properties Soil properties icon
    Soil Properties existing fill dialog
  2. You should see 6 different types of soil. Click OK to exit the dialog.

2.3 BOREHOLES

  1. Select Soils > Boreholes > Borehole Editor Borehole Editor Icon

Borehole Editor

You will see there are four existing boreholes defined in the initial tutorial file. The boreholes are also shown in the Plan View.

Borehole plan viewer

3.0 Section Creator

Next, we use the Section Creator to create a soil profile with the defined boreholes.

  1. Select Soils > Section creator.
  2. You'll be prompted with Enter vertex on the command prompt shown at the bottom right of the program.
     Section creator
  3. Enter the following coordinates: {-600, 0} for first point, then {0, 0} for second point. Press ENTER when done. After you define where you want to define your section, you will see the section creator dialog with boreholes as shown below:

Section Creator Dialog

3.1 GROUND SURFACE LAYER

We will first create the ground surface with the defined boreholes.

  1. Click Draw Ground Surface Draw Ground Surface icon
  2. You will be able to snap along the top of the boreholes. Select the top points of each boreholes as shown below.
  3. Right click and select Done after you've selected all the vertices.

    Tip: If you're finding it hard to select the top surface of boreholes, you can zoom in / zoom out on each boreholes with scrolls or built in zoom/in out feature for each boreholes Zoom In/Out Icon. Below is an example of utilizing zoom in feature to select the top surface.
    Figure with Result

3.2 INTERNAL BOUNDARIES

Now we will draw internal boundaries to connect between the boreholes.

  1. Click Draw Internal Boundary Draw internal boundary dialog
  2. Zoom in to each boreholes and select the layer underneath the top surface (1m fill layer) as shown below.
    Draw internal boundary
  3. Repeat this process for three other boreholes.

    TIP: In case you have accidentally selected the wrong location, you can undo the selection by Right click > undo.

    You should see the fill layer formed right underneath the ground surface layer.
    Draw internal boundary
  4. Now we will repeat this process for other layers. Select the layer underneath the fill layer as shown below and continue connecting this line to other boreholes with this layer.
  5. Draw internal boundary

    Some of the layers in some boreholes are thinner than other boreholes, so the zoom in / out feature will help snap to the layers.

    Your soil profile should look as the following after three-layer boundaries are added:

    Draw internal boundary 3 boundaries

  6. After drawing all internal boundaries by connecting the soil deposit depths from boreholes, click Define Bottom Elevation.
  7. We will select 'Use bottom of boreholes' as shown below. Click OK.

Define Bottom Elevation

Your section should look as follows:

Define Bottom Elevation section creator

3.3 ASSIGN MATERIALS

We can assign materials for each layer boundaries drawn.

  1. Click Assign Materials Assign Materials Icon
  2. You will be able to see list of material properties available to assign. We will assign each layers with the order shown in available materials: Existing Fill, Upper Sand, Clay I, Clay II, Lower Sand, and Deeper Sand.
  3. Zoom into the left borehole (Borehole 2) and assign each layer section with corresponding material as shown below:
    Assign Materials
    After assigning the material properties to each layer, your overall section profile should look as the following:
    Assign Materials
  4. Click OK to exit the dialog and you will see the 3D soil model created with the section creator as shown below.

Assign Materials 3D view

You can also see the section you have created in 3D viewer when Section Line is selected in the view controls as shown below.

Assign Materials 3D view

4.0 Add Load

4.1 ADD EMBANKMENT LOAD

Now we will apply embankment load to the created section.

  1. Select Loads > Add Embankment (Cross Section).
    Embankment Cross Section Designer
  2. Click Add and enter a Unit Weight of 0.12 at Stage 1.
    Initial Section Settings
  3. Click OK.
  4. Enter the following coordinates to the first embankment:
  5. XY
    00
    600
    2520
    020
  6. Click OK and the embankment should look as the following:
  7. Embankment Cross Section Designer

  8. Next, we will apply staged embankment installation. Click Add again. Enter the Unit weight of 0.12 and select stage 5 for installing the side extension embankment.
    Initial Section Settings
  9. This time, we will be extending the right portion of the embankment with a width of 25ft. Select two vertices and connect the last point to the first embankment as shown below:
    Embankment Cross Section Designer
  10. Click Done and you should see the extended embankment shown below.
  11. Embankment Cross Section Designer

    You have installed the extension at stage 5, so you can navigate on the stage tab on the right side of the dialog to see the embankment installation.
  12. We will lastly apply the top extension of the embankment on top. Click Add.
  13. This installation will be applied 30 days prior to the side embankment (Stage 6). Enter the Unit weight of 0.11. Select different color and click OK.
    Initial Section Settings
  14. Enter the following coordinates and click Done.
  15. XY
    020
    2520
    1530
    030

    You should see the following installation of the embankment shown below after stage 6.

    Embankment Cross Section Designer

  16. Before we click OK, we have to assign the elevation of the embankment. Enter 16 ft for Elevation (ft).
    Embankment Cross Section Designer
  17. Click OK.
  18. Now we will apply the embankment we have created to the model. Enter {-400, 0} for first point and enter {-200, 0} for second point to apply embankment load to the model.

You will see the embankment as shown below.

Embankment Cross Section Model

4.2 ADD RECTANGULAR LOAD

Now we will add a load on top of the embankment.

  1. Select Loads > Add polygonal loads.
  2. Enter the following coordinates for the vertices: {-400 -30}, {-200, -30}, {-200, -10}, {-400,- 10}. Press ENTER or select Done.
  3. Enter Pressure as 0.11 ksf and a Bottom Elevation of 36 ft. The Installation Stage should be at Stage 6.
    Add polygonal loads
  4. Click OK. You should see the embankment with slab load as shown below.

embankment with slab load

5.0 Results

5.1 QUERY LINE

Add a query line underneath the embankment to see the settlement results.

  1. Select Query > Add Query line.
  2. Click OK when the dialog pops up (keep default value) and enter the coordinates {-400 -20} and {-200, -20}.
  3. We will add another query line along the width of the embankment at the center. Select Add query line again and enter the following coordinates: {-300, -40}, {-300, 20}.

    You should see the following contour settlement result as shown below underneath the load.
    Query line result
  4. You can also see the field grid contour of settlement underneath the embankment load by selecting Grid > Auto Field Point Grid.
  5. Keep the default values and click OK.

    You should be able to see the contour of settlement as shown below:

 Auto Field Point Grid

As shown above, the contour settlement shows greater settlement along the region where the soil profile is thinner than the right side of the embankment where the soil profile is thicker. Also, note that the load is applied at constant elevation along the width of the embankment. The field grid point shows distributed settlement that corresponds to the soil profile created with the section creator.

We recommend you to try out different types of analysis using this model such as adding additional load for immediate settlement, or ground improvement and run primary consolidation analysis.

This feature allows you to create a variety range of soil profiles with flexibility of defining soil layout along the section line A-A'. Section creator option provides many other features including import *.dxf, extended material layers outside the section line A-A' etc. Be sure to check out the Section creator help page for more information.

6.0 Additional Exercise

As an additional exercise, we'll use the improved section creator to model a 2D soil profile with sink holes and non-horizontal soil layer in the section creator.

Before we modify the section creator, we’ll be assigning a new soil material type to the new section.

6.1 SOIL PROPERTIES

  1. Select Soils > Soil Properties Soil properties icon
  2. Create a new layer by selecting the plus icon and name it Quartz sands and silts.
  3. Keep the Unit Weight and Saturated Unit Weight to 0.115 (kips/ft3).
  4. Enable Immediate settlement with Es and Esur values of 1200 ksf.
    additional exercise_soil properties
  5. Go to the Primary consolidation tab. Select the Non-linear method and enter the following parameter values:
    • Cc = 2.5,
    • Cr = 0.1,
    • e0 = 0.7, Pc = 2.1.
    • Cv & Cvr = 0.0531 ft2/d
    • B-bar = 1.

soil property add primary consol

Now we’ll be assigning this new material to the 2D soil profile in section creator.

6.2 SECTION CREATOR

  1. Right click on the section creator and select Open Section Creator. We’ll be modifying the soil profile from the section creator.
  2. Right click on third vertex of borehole 3 and move it down to the bottom layer as shown below.
    Before:

    before

    After:

    After
  3. The modified vertex coordinate for this specific tutorial is at (200, -62.7). You can right click on the internal boundary line and re-enter the coordinates to match with the tutorial example.

Section Creator gif


Now we’ll add another discontinuous soil layer which starts at the end of Borehole 4.

6.3 INTERNAL BOUNDARIES

  1. Click Add internal boundary.
    add internal boundary
  2. Select the starting point at the end of the Borehole 4. While the line is being drawn, right click and select Coordinate Table as shown below.
    coordinate table
  3. Enter the following coordinates.
  4. PointXY
    1400-61
    2520-50
    3570-65
    4400-61

    coordinates

After modifying the layers, you’ll see that now we have a two discontinuous soil layers within the 2D soil model profile as shown below:

6.4 MATERIAL ASSIGNMENT

  1. Click Assign materials assgin-material
    quartz sand and silts
  2. We’ll be assigning Quartz sands and silts to these modified layers. The following below shows the assigned soil layer as shown below:
    quartz sand and silts assigned
  3. Click OK. Then, you’ll see the updated soil profile with new settlement analysis result as shown in section 6.5.

6.5 RESULTS

plan view result

This is a close-up view of the modified 2D soil profile with discontinuous soil layer addition.

3d view result

This concludes the tutorial 22 – section creator.

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