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Estimates of runout distance of liquefied tailings from a failed dam may use strength-based approaches
using either rheological parameters, or the critical state concept of undrained steady state strength.
Problems associated with selection of rheological parameters are discussed. It is proposed that a reasonable
approach is the assumption usy s=τ and 0=pη . Energy/work based methods are used as a check on this
assumption and found to give good agreement. The effect of assumptions regarding the volume of material
incorporated in the slide area is also investigated using the energy-based equations. The results indicate that
there is a limiting volume, above which significant increases in the runout distance do not occur.
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