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Tailings classified as nonplastic silt and sand were prepared as slurries, consolidated, and subjected to cyclic direct simple shear testing. The cyclic resistance and shear modulus reduction were found to be fairly similar to those of clean sand. However, the level of consolidation stress had no significant effect on the cyclic resistance. The simplified method of liquefaction analysis is generally applicable to these tailings.
The stability of cut slopes is greatly influenced by seasonal pore-water pressure variations under the combined effect of rainfall and vegetation. However, predicting soil–atmosphere interaction is not straightforward, due to the complexity of both the boundary conditions involved and the hydromechanical behaviour of soils, which is coupled and highly nonlinear, rendering the use of numerical tools, such as finite element analysis, necessary.
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