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Borehole Manager

1.0 Introduction

In Slide3, you can create 3D geometry with borehole data using Borehole Manager. This simple tool allows you to create a 3D geometry with input parameters from the borehole data such as location, soil profile with multiple layers, water table, and orientation of the borehole.

In this tutorial, we will create a 3D multi-layered soil model using a Borehole Manager with water table and investigate the FOS using the model. In addition to the slope stability analysis, seepage analysis can also be performed using water pressure grid import from RS3 which is included as an additional exercise for this tutorial.

Finished Product:

All tutorial files installed with Slide3 can be accessed by selecting File > Recent > Tutorials folder from the Slide3 main menu.

The finished product of this tutorial can be found in the Borehole Manager_final.Slide3m2 file.

Want to watch a video version of this tutorial? Check it out here:

2.0 Model

2.1 Open Initial File

  1. Select File > Recent > Tutorials in the menu and open the starting file Borehole Manager_initial.Slide3m2 .

2.2 Project Settings

When you open the initial file, it will have the geometry of the model. We'll check a few things in the project settings and slip surface option before proceeding to next step.

  1. Select Analysis > Project Settings project settings icon
  2. Go to Units and make sure they're in metric, stress as kPa.
  3. Under Methods, only Spencer should be selected.
  4. For the Groundwater method, leave the setting as Water Surfaces with a unit weight of 9.81 kN/m3.
  5. Select OK.

2.3 Surface slip option

Now we will check the slip surface option settings.

  1. Select Surfaces > Slip Surface Options slip surface options
  2. Under the Filter setting, make sure the minimum depth with 20 m is selected.

Project Settings

Now we will enter our borehole data for this model.

3.0 Enter Borehole data

  1. Select Material > Borehole Manager
    Boreholes Dialog
  2. When you see the boreholes dialog, select the Add Button add button on left side of the borehole side tree. Add 4 boreholes.
  3. Then, within the materials dialog, select the insert row below button insert row below option and you will see the two extra layers on the materials.
  4. Assign the first layer to Stratum I (Tn), Second layer to Stratum II (Tm), and the bottom layer as Stratum IIIa (Ta) by clicking the drop-down menu from the materials tab.
  5. Click Borehole Settings.
  6. Leave the settings to default: Interpolation to Linear/Triangulation, with a resolution to standard.
  7. Modifying these settings allow users to create smoother/improved interpolation of data points between the boreholes. If you want to see more information on the interpolation/resolution option, refer to Interpolation Method.

  8. Click OK to return to the borehole manager. We will be entering the borehole data into Slide3. Enter the following coordinates of (x,y,z) on location, enter the water elevation, and enter the thickness of each layer according to the table shown.
  9. Borehole Data

    X

    Y

    Z

    St1

    St2

    St3

    Water Elevation

    BH1

    221

    663

    202

    20

    30

    30

    192

    BH2

    331

    757

    227

    30

    25

    45

    217

    BH3

    379

    650

    194

    10

    15

    50

    150

    BH4

    297

    573

    177

    0

    5

    60

    130

    For Borehole 1, you should see the following inputs shown here:

    Borehole Settings

  10. Make sure the generate top/bottom surface option is not selected. Once the borehole data is entered, select OK.

4.0 Apply Water table

Now we assign water table to the materials.

  1. Select Groundwater > Assign Water to materials assing water icon

    Hydraulic Assignments Dialog

  2. Select Borehole Water Table under the drop-down menu and select Apply to All Materials.
  3. Click OK.

5.0 Geometry model creation

Now we will create external volumes of the model with the borehole we've entered.

  1. Select Geometry > 3D Boolean > Divide Alldivide all icon

    Divide All

  2. Select OK with default settings.

6.0 Compute

Now we will compute the model.

  1. Select Analysis > Compute compute icon
  2. You will see the result as shown below with Spencer of approximately 1.448.

    Model with Boreholes View

  3. Select Add surface safety map surface safety map iconfrom the toolbar.
  4. You will see the following contour plot of the hot (more critical) to cold (less critical) region of the slope.

    Contour Plot of Slope Model View

  5. Select File > Save save icon

This concludes the Borehole Manager tutorial in Slide3.

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