Tutorial_02_Materials_and_Loading.pdf

Materials & Loading Tutorial

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Materials & Loading Tutorial

This tutorial will demonstrate how to model a more complex multi-

material slope, with both pore water pressure and an external load.

MODEL FEATURES:

• multiple material slope, with weak layer

• pore pressure defined by water table

• uniformly distributed external load

• circular slip surface search (Grid Search)

The finished product of this tutorial can be found in the Tutorial 02

Materials and Loading.sli data file, located in the Examples >

Tutorials folder in your Slide installation folder.

Model

If you have not already done so, run the Slide Model program by double-

clicking on the Slide icon in your installation folder. Or from the Start

menu, select Programs → Rocscience → Slide 5.0 → Slide.

If the Slide application window is not already maximized, maximize it

now, so that the full screen is available for viewing the model.

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Limits

Let’s first set the limits of the drawing region, so that we can see the

model being created as we enter the geometry.

Select: View → Limits

Enter the following minimum and maximum x-y coordinates in the View

Limits dialog. Select OK.

Figure 2-1: View Limits dialog.

These limits will approximately center the model in the drawing region,

when you enter it as described below.

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Project Settings

Although we do not need to set any Project Settings for this tutorial, let’s

briefly examine the Project Settings dialog.

Select: Analysis → Project Settings

Figure 2-2: Project Settings dialog.

Select the Groundwater tab.

Notice the various methods of defining pore pressure conditions in Slide .

For this tutorial, we will be using the default (Groundwater Method =

Water Surfaces). This allows pore pressure to be calculated from a Water

Table or Piezometric surfaces.

We will be using all of the default selections in Project Settings, however,

select the General tab, and enter a Project Title – Materials & Loading

Tutorial . Select OK.

Entering Boundaries

The first boundary that must be defined for every Slide model, is the

External Boundary (see the Quick Start Tutorial for a definition of the

External Boundary in Slide ).

To add the External Boundary, select Add External Boundary from the

toolbar or the Boundaries menu.

Select: Boundaries → Add External Boundary

Enter the following coordinates in the prompt line at the bottom right of

the screen.

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Enter vertex [esc=quit]: 5 0

Enter vertex [u=undo,esc=quit]: 100 0

Enter vertex [u=undo,esc=quit]: 100 34

Enter vertex [c=close,u=undo,esc=quit]: 100 36

Enter vertex [c=close,u=undo,esc=quit]: 100 40

Enter vertex [c=close,u=undo,esc=quit]: 67 40

Enter vertex [c=close,u=undo,esc=quit]: 43 28

Enter vertex [c=close,u=undo,esc=quit]: 5 28

Enter vertex [c=close,u=undo,esc=quit]: 5 18

Enter vertex [c=close,u=undo,esc=quit]: 5 16

Enter vertex [c=close,u=undo,esc=quit]: c

Note that entering c after the last vertex has been entered, automatically

connects the first and last vertices (closes the boundary), and exits the

Add External Boundary option.

Add Material Boundaries

Material boundaries are used in Slide to define the boundaries between

different material zones within the External Boundary. Let’s add two

material boundaries, to define the location of a weak layer.

Select: Boundaries → Add Material Boundary

Since we planned ahead, there are already vertices on the External

Boundary, which we can graphically “snap” to.

1. First make sure that the Snap option is enabled on the Status Bar.

When Snap is enabled, the cursor will change to a circle when it is

positioned over a vertex, allowing you to snap exactly to the vertex.

2. Position the cursor over the External Boundary vertex at ( 5 , 18 )

and click the left mouse button.

3. Position the cursor over the External Boundary vertex at ( 100 , 36 )

and click the left mouse button.

4. Right-click the mouse and select Done.

The first material boundary has been added. Now add a second material

boundary.

Select: Boundaries → Add Material Boundary

Repeat steps 2 – 4, to add a second material boundary, by snapping to the

External Boundary vertices at ( 5 , 16 ) and ( 100 , 34 ). Your model

should look as follows:

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Figure 2-3: External and material boundaries added.

Add Water Table

Now let’s add the water table, in order to define the pore pressure

conditions.

Select: Boundaries → Add Water Table

You should still be in Snap mode, so use the mouse to snap the first two

vertices to existing External Boundary vertices, and enter the rest of the

vertices in the prompt line.

Enter vertex [esc=quit]: use the mouse to snap to the vertex at

5 28

Enter vertex [u=undo,esc=quit]: use the mouse to snap to the

vertex at 43 28

Enter vertex [u=undo,esc=quit]: 49 30

Enter vertex [c=close,u=undo,esc=quit]: 60 34

Enter vertex [c=close,u=undo,esc=quit]: 66 36

Enter vertex [c=close,u=undo,esc=quit]: 74 38

Enter vertex [c=close,u=undo,esc=quit]: 80 38.5

Enter vertex [c=close,u=undo,esc=quit]: 100 38.5

Enter vertex [c=close,u=undo,esc=quit]: press Enter or right-

click and select Done

You will now see the Assign Water Table dialog.

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