Tutorial_04_Composite_Surfaces.pdf

Composite Surfaces Tutorial

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Composite Surfaces Tutorial

This tutorial will use the same model as the Materials & Loading

Tutorial (with some modifications), to demonstrate how to perform a

circular surface search, which allows composite circular / non-circular

surfaces to be analyzed as well.

MODEL FEATURES:

• multiple material slope, with weak layer above impenetrable

material (e.g. bedrock, or soil with much higher strength)

• pore pressure defined by water table

• uniformly distributed external load

• circular Grid Search, with Composite Surfaces option enabled

• demonstration of Auto Refine Search option

The finished product of this tutorial (file: Tutorial 04 Composite

Surfaces.sli ) can be found in the Examples > Tutorials folder in your

Slide installation folder.

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Composite Surfaces Tutorial

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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.

Since this tutorial is based on the Materials and Loading model, we will

read in a file, rather than repeating the modeling procedure.

Select: File → Open

If you completed the Materials and Loading tutorial, and saved the file,

you can use this file ( ml_circ.sli ). If you did not do this tutorial, or did

not save the file, then the required file is also available in the Examples

> Tutorials folder in your Slide installation folder (filename: Tutorial 02

Materials and Loading.sli ).

Open whichever file is most convenient.

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Surface Options

First of all, let’s enable the Composite Surfaces option, in the Surface

Options dialog.

Select: Surfaces → Surface Options

9 Enter:

Surface Type = Circular

Search Method = Grid

Radius Increment = 10

9 Composite Surfaces

Figure 4-1: Surface Options dialog.

In the Surface Options dialog, select the Composite Surfaces checkbox,

and select OK.

What is a Composite Surface?

Normally, when circular surfaces are analyzed in Slide , if a circular

surface extends past the lower limits of the External Boundary, the

surface is discarded, and is not analyzed. A circular surface search may

generate a large number of such surfaces, depending on your External

Boundary geometry, and search parameters (grid location, Slope Limits,

etc).

If the Composite Surfaces option is enabled, then circular surfaces which

extend past the lower limits of the External Boundary, will automatically

conform to the shape of the External Boundary, between the two circle

intersection points along the lower edge of the boundary. This is

illustrated in the following figure.

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Figure 4-2: Example of a composite slip surface.

Composite surfaces allow the user to model a bedrock surface, for

example, by entering appropriate coordinates for the lower edge of the

External Boundary. They can then perform a circular surface search

which will conform to the shape of the bedrock, by simply using the

Composite Surfaces option. These surfaces will be analyzed and NOT

discarded.

The material strength used for each slice along the linear portions of the

composite surface, will be the strength of the material immediately above

each slice base.

In order to use our previous model that we have just opened, a simple

modification will be required.

Editing Boundaries

To use the current model for this composite surface example, we need to

raise the lower edge of the External Boundary, so that it is coincident

with the location of the lower of the two Material Boundaries.

We can do this as follows. For this example, we will demonstrate the

useful right-click editing capabilities of Slide . Rather than using the

menu or the toolbar, most editing operations in Slide can be carried out

using right-click shortcuts, as described below.

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Right Click Shortcuts

1. First of all, we need to delete the LOWER of the two Material

Boundaries. Right-click the mouse ON the LOWER of the two

Material Boundaries. A popup menu will appear. Select Delete

Boundary from the popup menu, and the material boundary will be

deleted.

2. Next, we will delete the bottom two vertices of the External

Boundary. Right-click the mouse on the lower LEFT vertex of the

External Boundary, and select Delete Vertex from the popup menu.

The vertex will be deleted.

3. Right-click the mouse on the lower RIGHT vertex of the External

Boundary, and select Delete Vertex from the popup menu. The vertex

will be deleted.

4. The lower edge of the External Boundary is now in the same location

as the Material Boundary we deleted. Whenever vertices are deleted,

boundaries are redrawn using the remaining vertices. In this case,

the External Boundary has “snapped” up to the location of the lower

material boundary vertices.

5. Select Zoom All to zoom the model to the center of the view. Tip: as a

shortcut, you can right-click the mouse and select Zoom All from the

popup menu, or you can use the F2 function key as a shortcut to

Zoom All.

6. Finally, notice that in the process of editing the boundaries, the

“weak layer” material assignment has been reset. This can be easily

re-assigned, as follows.

7. Right-click the mouse IN the weak layer (i.e. between the material

boundary and the lower edge of the external Boundary). Do NOT

click ON a boundary, click BETWEEN the two boundaries.

8. From the popup menu, select the Assign Material sub-menu, and

then select the “weak layer” material from the Assign sub-menu. The

“weak layer” material assignment is now in effect once again.

The model should look as follows:

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