This article presents a methodology to perform a numerical analysis using the constitutive model Sanisand to evaluate the stability of a designed dewatered tailings storage facility (TSF). The Sanisand model is based on the Critical State Soil Mechanics framework and enables the prediction of mechanical behavior under both monotonic and cyclic loading conditions for sandy soils. The model's capability to capture stress-strain responses across a wide range of densities and confining pressures using a single set of calibrated dimensionless constants is highlighted.
Static and dynamic analysis using finite element models in Plaxis 2D are presented including the validation of the numerical implementation against a finite difference program.
Results show the response of changing instantaneous static loads and void ratios through a vulnerability framework to assess the impact of the compaction level of ideally saturated materials on the stability of the dewatered TSF. Additional, using the same set of parameters was possible to execute a seismic analysis considering the design at operation and displacements due dynamic loading for drained and undrained layers are reported.
In conclusion, beyond limit equilibrium analysis, numerical analysis using the Sanisand constitutive model is a suitable approach for evaluating the risk posed by dewatered TSF facilities subjected to both monotonic and cyclic loading.
