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2.2.2
Translational sliding
Translational sliding is similar to rotational sliding; however the failure surface is straight
rather than arcuate, as shown in Figure 2.9. It occurs when a weaker soil overlies a stiff
stratum, causing the weaker soil to slide downwards (Sivakugan, 2007).
Stiff stratum
Stiff stratum
Figure 2.9: Translational sliding failure
Figure 2.10: Compound failure
A combination of rotational and translational failure (called a compound failure) occurs when
the slip surface is circular but is intercepted by a stiff stratum causing a straight failure surface
along the interface between strata.
Figure 2.11: Example of translational sliding (Swiss Confederation, 2005)
Translational and compound failure surfaces are known as non-circular failure surfaces.
Methods due to Morgenstern and Price (1965), Spencer (1967), and Janbu (1954) can be used
to calculate factors of safety for non-circular failure surfaces.
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