Tutorial_03_Non-Circular_Surfaces.pdf

Non-Circular Surfaces Tutorial

3-1

Non-Circular Surfaces Tutorial

This tutorial will use the same model as Tutorial 02 (Materials &

Loading Tutorial), to demonstrate how an analysis can be performed

using non-circular (piece-wise linear) slip surfaces.

MODEL FEATURES:

• multiple material slope, with weak layer

• pore pressure defined by water table

• uniformly distributed external load

• Block Search for non-circular slip surfaces

The finished product of this tutorial can be found in the Tutorial 03

Non-Circular Surfaces.sli data file, which is located in the Examples >

Tutorials folder in your Slide installation folder.

Slide v.5.0

Tutorial Manual

Non-Circular Surfaces Tutorial

3-2

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 we are using exactly the same model from the previous tutorial, we

will not repeat the modeling procedure, but simply read in a file.

Select: File → Open

If you completed the previous tutorial, and saved the file, you can use

this file ( ml_circ.sli ). If you did not do the previous tutorial, or did not

save the file, then the required file is also available in the Examples >

Tutorials folder in your Slide installation folder (file: Tutorial 02

Materials and Loading.sli ).

Open whichever file is most convenient.

Slide v.5.0

Tutorial Manual

Non-Circular Surfaces Tutorial

3-3

Surface Options

The first thing we need to do, is change the Surface Type to Non-Circular,

in the Surface Options dialog.

Select: Surfaces → Surface Options

9 Enter:

9 Surface Type = Non-Circ.

Search Method = Block

Number of Surf = 5000

Left Angle Start = 135

Left Angle End = 135

Right Angle Start = 45

Right Angle End = 45

Figure 3-1: Surface Options dialog.

In the Surface Options dialog, change the Surface Type to Non-Circular.

Notice that two different Search Methods can be used in Slide for Non-

Circular Surfaces – Block Search or Path Search. This tutorial will

demonstrate the Block Search Method. For details about the Path Search

Method, see the Slide Help system.

We will be using all of the default Block Search Options for now, so just

select OK.

Notice that the slip center grid, which we used to perform the Grid

Search, is now hidden from view, since it is not applicable for non-

circular surface searches.

Select Zoom All to zoom the model to the center of the view. Tip: you can

right-click the mouse and select Zoom All, or use the F2 function key, as

short-cuts.

Slide v.5.0

Tutorial Manual

Non-Circular Surfaces Tutorial

3-4

Block Search

The term “Block Search” is used in Slide , since a typical non-circular

sliding mass, with only a few sliding planes, can be considered as

consisting of active, passive and central blocks of material, as shown

below.

Figure 3-2: Active, central and passive blocks.

In order to carry out a Block Search with Slide , the user must create one

or more Block Search objects (window, line, point or polyline). The Block

Search objects are used to randomly generate the locations of slip surface

vertices.

For a model with a narrow weak layer, the best way to perform a Block

Search is to use the Block Search Polyline option. This option works as

follows:

1. TWO points are first generated on the polyline, according to user-

definable selections.

2. The slip surface is constrained to follow the polyline, between the two

points.

3. The projection angles are used to project the surface up to the ground

surface, from the two points.

4. Steps 1 to 3 are repeated for the required number of slip surfaces.

Let’s add the polyline to the model.

Select the Add Block Search Polyline option from the toolbar, or from the

Block Search sub-menu in the Surfaces menu. (Notice that the options in

the toolbar and Surfaces menu are now applicable to non-circular

surfaces, since we changed the Surface Type from Circular to Non-

Circular in the Surface Options dialog).

Slide v.5.0

Tutorial Manual

Non-Circular Surfaces Tutorial

3-5

Select: Surfaces → Block Search → Add Polyline

You will then see the following dialog.

This dialog allows you to specify how the two points will be generated on

the polyline. The points can be randomly generated at any location (the

Any Line Segment option), or randomly generated on the first or last line

segments, or fixed at the endpoints of the polyline.

In most cases, it is best to start with the Any Line Segment option, to

maximize the coverage of the search along the polyline. This is already

the default selection for both points, so just select OK in the dialog.

Now enter the points defining the polyline. The points can be entered

graphically with the mouse, but we will enter the following points in the

prompt line:

Enter point [esc=quit]: 39 23

Enter point [u=undo, esc=quit]: 81 31

Enter point [u=undo, esc=quit]: press Enter or right-click and

select Done

The Block Search Polyline search object is now added to the model,

within the weak layer. Notice the arrows displayed on either side of the

line. The arrows represent the left and right projection angles which will

be used for projecting the slip surface to the ground surface. The

projection angles can be customized by the user in the Surface Options

dialog, which we will be doing later in this tutorial. For now, we are

using the default angles.

Slide v.5.0

Tutorial Manual

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: