Comparison of the Yield Locus and Stress-dilatancy Function of Some Critical State Constitutive Models with Experimental Data for Carbonate Sand

Carbonate sands are frequently encountered in offshore regions. Consequently, the foundations of many oil and gas platforms and drilling rigs are constructed on these sands. For economy of foundation design and construction, it is imperative first to understand the mechanical behaviour of these soils and then to develop appropriate constitutive equation to characterize their behaviour. Carbonate sand has some distinctive characteristics which sets them apart from other soils. While their permeability, elastic response and plastic flow behaviour is similar to normal sands, their compressibility characteristics are similar to that of clays. The ultimate friction angles are, however, as high as that of coarse aggregates. However, these friction angles are mobilized only at large shear strains.

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