Current version:
v5.01 (5.01.x.01)
24 September 2007
GALENA is a trademark and registrered trademark of Clover Associates Pty Ltd
Stability analysis shouldn't be an uphill battle!

Features - Failure Surface Definition

Have you ever battled with circular failure surface definition using the traditional concept of an abstract point in space? And then tried to relate that surface to the slope surface?

The old way is just that - again, GALENA introduced a better way!

Circular Failure Surface definition using circle centres can be a thing of the past with GALENA's unique approach of definition in terms
of the actual slope rather than an abstract point in space.

With GALENA you can define circular failure surfaces simply, by defining their X co-ordinate intersection points with the slope surface (X-Left & X-Right), together with a nominal or desired radius, and leave the hard work to GALENA.

GALENA can of course still use the more traditional definitions;
you can even combine the more traditional definitions with those provided by GALENA’s innovative and leading approach.

Definition of non-circular failure surfaces is either with GALENA's CAD-style mouse line-draw function, by keyboard co-ordinate entry, or a combination of both - you can even create a non-circular failure surface from a circular failure surface in a few easy steps.

Definition made easy - the way it should be!

Tension cracks can be used within GALENA, and can be either manually defined, or can be of
a specified depth for GALENA to automatically generate on-the-run for inclusion in all analyses... a particularly useful feature for multiple analyses.

The image below shows a dam augmentation model - the material profiles are defined in the more traditional manner as the slope surface is unlikely to be redefined. The dam core is defined as a closed polygon.

The circular failure surface is defined by its X-Left and X-Right intersects with the slope surface, together with a nominal Radius - this makes failure surface positioning very quick and easy.
 
GALENA's method of circular failure surface definition is quick and easy

The image below shows a simple horizontally-bedded slope with a thin weak clay layer (shown in yellow) just below the surface of the lower part of the slope. A phreatic surface exists at the base of the weak clay layer.

A non-circular failure surface has been defined (using GALENA’s mouse line-draw function to position part of the failure surface within the weak layer.

The model is ready for a multiple analysis - restraints have been defined to ensure the trial failure surfaces generated for analysis are all within the area of interest (within and around the weak clay layer).
 
The restraints concentrate the search around the defined non-circular failure surface and within the weak clay layer
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Updated: 5 February 2007