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Borehole Manager

1. 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 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 additional exercise for this tutorial.

All tutorial files installed with Slide3 can be accessed by selecting File > Recent > Tutorials folder from the Slid3 main menu. You can find the starting initial file in the Borehole Manager_initial.Slide3m2 file. The finished product of this tutorial can be found in the Borehole Manager_final.Slide3m2 file.

2. Project Settings / Surface slip option

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

Project Settings Icon Select: Analysis > Project Settings

Go to Units and make sure they're in metric, stress as kPa.

under methods, only Spencer should be selected.

For groundwater method, leave the setting as Water Surfaces with unit weight of 9.81 kN/m3. Select OK.

Now we will check the slip surface option setting.

Slip Surface Icon Select: Surfaces > Slip Surface Options

Under the Filter setting, make sure the minimum depth with 20 m is selected.

Slip Surface Options Dialog

Now we will enter our borehole data on this model.

3. Enter Borehole data

Boreholes Icon Select: Material > Borehole Manager

When you see the boreholes dialog, select the Add Button add button on left side of the borehole side tree. Add 4 boreholes and you will see the following:

Boreholes Dialog

Then, within the materials dialog, select the insert row below option and you will see the two extra layers on the materials.

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.

Select the Borehole Settings and you will see the following inputs:

Borehole Settings Dialog

Leave the settings to default: Interpolation to Linear/Triangulation, with resolution to standard.

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.

We will be entering the borehole data to 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.

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

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

4. Geometry model creation

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

Intersecting Square and Circle Icon Select: Geometry > 3D Boolean > Divide All

Divide All Parameters Dialog

Select OK with default setting.

5. Apply Water table

Now we assign water table to the materials.

Water Table Materials Icon Select: Groundwater > Assign Water to materials.

Hydraulic Assignments Dialog

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

5. Compute

Now we will compute the model.

Calculator Icon Select: Compute

You will see the result as shown below with Spencer of approximately 1.448.

Model with Boreholes View

Surface Safety Map Icon Select: Add surface safety map from the toolbar.

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

Save Icon Select: File > Save.

This concludes borehole manager tutorial for water condition.

This concludes the borehole manager tutorial in Slide3.

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