How can pore pressures be modelled?
Pore pressures can be modelled in GALENA in several different ways: • A simple phreatic surface that applies to all material below the surface; • A piezometric surface that can be applied to one or any number of layers such that there can be a separate pore water pressure regime for each layer (e.g. a confined aquifer); • Pore water pressures can be specified as an Ru pressure for each layer; • Density values can be assigned to a liquid in the slope and above the slope. For example, a tailings dam may cause the ground beneath it to be saturated with water (with a density of 9.81 kN/m3; or 62.4 lbf/ft3;) but the density of the tailings slurry may be greater than water (say 11 kN/m3; or 70.0 lbf/ft3;). In this case the uplift pressure from the tailings is still that due to water (9.81 kN/m3; or 62.4 lbf/ft3;) but the stability effect is that due to the tailings density (11 kN/m3; or 70.0 lbf/ft3;). This feature enables the user to assign a phreatic surface as a horizontal straight line a
