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GEO5

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Influence of Water

Influnce of water can be considered using following options: general shape of GWT, horizontal GWT or directly by water acting on the blocks.

General shape of GWT

General shape of GWT is entered as a polygon. The pore pressure (stress) on the slip surface is considered linearly according to the equation: u = γw * zw.

where:

γw

-

unit weight of water

zw

-

height of GWT above slip surface in the joints

The resultant forces U (force due to water on slip surface) or Fv (force due to water on internal slip surface acting on the submerge part of joint per metre of width) are calculated from the pore pressure load diagrams.

Forces from the water acting on block - water can flow freely of the gap

Forces from the water acting on block - water can't flow of the gap

Horizontal GWT

The horizontal GWT is entered by constant height hw over heel of the slope (from the origin of the coordinate system). Influence of water is considered from the water level (GWT) to a given point on the vertical.

Water entered on blocks

The water pressure along the joints and on the slip surface can be taken into account. It is introduced as external load:

Force due to water on internal slip surface (water between blocks) Fv

It must be introduced into the analysis whenever the presence of water in the joints between blocks is expected. It is applied as a resultant force Fv in kN (the pressure acting on the immerse part of the joint per 1m run is considered).

Force due to water on external slip surface (uplift pressure) U

It is defined as hydrostatic pressure on each slip surface of the polygon (external slip surface) separately and introduced as an external load (uplift pressure) U in kN, which can be reduced depending on the slip surface permeability (the pressure acting on the immerse part of the slip surface per 1m run is considered).

Water forces acting on a rock block