In the previous chapter, it was noted that the most realistic position of the critical slip surface is obtained
when effective strength parameters are used in the analysis. Effective strength parameters, however, are
only meaningful when they are used in conjunction with pore-water pressures. In this sense, the porewater
pressures are as important in establishing the correct shear strength as the shear strength parameters
themselves.
Due to the importance of pore-water pressures in a stability analysis, SLOPE/W has various ways of
specifying the pore-water pressure conditions. This chapter gives an overview of the options available,
and presents some comments on the applicability of the various methods.
8.2 Piezometric surfaces
The most common way of defining pore-water pressure conditions is with a piezometric line. With this
option, SLOPE/W simply computes the vertical distance from the slice base mid-point up to the
piezometric line, and multiplies this distance times the unit weight of water to get the pore-water pressure
at the slice base. This is graphically illustrated in Figure 8-1.
In the previous chapter, it was noted that the most realistic position of the critical slip surface is obtainedwhen effective strength parameters are used in the analysis. Effective strength parameters, however, areonly meaningful when they are used in conjunction with pore-water pressures. In this sense, the porewaterpressures are as important in establishing the correct shear strength as the shear strength parametersthemselves.Due to the importance of pore-water pressures in a stability analysis, SLOPE/W has various ways ofspecifying the pore-water pressure conditions. This chapter gives an overview of the options available,and presents some comments on the applicability of the various methods.8.2 Piezometric surfacesThe most common way of defining pore-water pressure conditions is with a piezometric line. With thisoption, SLOPE/W simply computes the vertical distance from the slice base mid-point up to thepiezometric line, and multiplies this distance times the unit weight of water to get the pore-water pressureat the slice base. This is graphically illustrated in Figure 8-1.
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