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Features - Water Definition, Pressures and Positions
Ground water pressures, the most important parameter affecting the stability of structures and excavations, need to be defined realistically for different problems. GALENA provides you with the tools to realistically define ground water, and to define water and denser-than-water mediums above ground, a feature that GALENA pioneered for tailings dam work.
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For realistic water pressure definition for different problems GALENA enables water pressure to be defined as:
- a simple phreatic surface
- a piezometric pressure within one, two..., or all material layers
- an Ru pressure within one, two..., or all material layers
- a dense above-ground liquid medium such as tailings slurry, or water, or
- any combination of these.
GALENA allows definition of a phreatic surface that extends above the slope surface, with a density specified for the above-ground medium - this is particularly useful for modelling water retaining structures such as dams, tailings dams or slurry pondages.
Phreatic surface definition is simple - just two points in many cases, and GALENA's CAD-like mouse-draw functions make for easy definition of draw-down and non-planar surfaces.
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Phreatic surface definition in GALENA also provides a simple way of modelling a fully or partially saturated slope where the density of the medium-above-ground is simply defined as 0.0 (zero).
These and other features are simply part of the way GALENA makes it easier for you.
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The image below shows a complex dam with a clay core. The bedrock layer (sandstone) contains a piezometric surface (shown in cyan and labelled); and the dam water level (shown in blue and labelled) is modeled as a phreatic surface. The phreatic surface defines the water level behind the dam and within the dam structure, and controls the pore-water pressures within the weathered sandstone and clay layers.
It should be noted that with GALENA both the upstream face and downstream face of the dam can be analysed using the one model, simply by defining the failure surface appropriately - there is no need to ‘flip’ the model over to analyse the two faces. In this particular case the upstream face is being analysed for a ‘dam full’ scenario.
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Copyright © 1990-2008 Clover Associates Pty Ltd
Updated: 18 July 2008
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