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Recent failures of upstream-raised tailings storage facilities (TSF) raisedcon-cerns on the future use of these dams. While being cost-effective, theyentail higher risks than conventional dams, as stability largely relies on thestrength of tailings, which are loose and normally-consolidated materials thatmay exhibit strain-softening during un-drained loading. Current design practiceinvolves limit equilibrium analyses adopting a fully-softened shear strength;while being conservative, this practice neglects the work input required tostart the softening process that leads to progressive failure. This paperdescribes the calibration and application of the NGI-ADPSoft constitutive modelto evaluate the potential of static liquefaction of an upstream-raised TSF andprovides an indirect measure of resilience. The constitutive model incorporatesundrained shear strength anisotropy and a mesh-independent anisotropicpost-peak strain softening. The calibration is performed using laboratorytesting, including anisotropically-consolidated triaxial compression tests anddirect simple shear tests. The peak and residual undrained shear strengths arevalidated by statistical interpretation of the available CPTu data. It is shownthat this numerical exercise is useful to verify the robustness of the TSFdesign.

Stability assessment of a tailings storage facility using a non-local constitutive model accounting for anisotropic strain-softening