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 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.

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

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

2. Project Settings / Surface slip option

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.

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

Now we will check the slip surface option setting.

Select Surfaces > Slip Surface Options

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

Now we will enter our borehole data on this model.

3. Enter Borehole data

Select Material > Borehole Manager

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

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:

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

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:

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.

Select Geometry > 3D Boolean > Divide All

Select OK with default setting.

5. Apply Water table

Now we assign water table to the materials.

Select Groundwater > Assign Water to materials.

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.

Select Compute

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

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.

Select File > Save.

This concludes the Borehole Manager tutorial in Slide3.