Finite element‑based probabilistic stability analysis of rock‑fill tailing dam considering regional seismicity

摘要

The recent tailing dam failure in Brazil has again emphasized the need of performing robust stability analysis prior to construction.This paper demonstrates the probabilistic dynamic stability analysis of tailing dams considering an existing rock-filltailing dam in India. The stability analysis was performed using 2D finite element-based package RS~2.In the probabilisticanalysis, the strength parameters such as cohesion © and the friction angle (φ) were considered as random variables. Intotal, 3000 numbers of samples were generated assuming a normal distribution. Monte Carlo simulation was used to evaluatethe probability of failure (PoF) and reliability index. Strength reduction method was used for the finite element analyses. Apseudo-static seismic loading was incorporated in the strength reduction analysis to check the seismic stability of the dam.A factor of safety (FoS) of 1.15 was observed from the deterministic analysis for downstream slope. For the same case, theprobabilistic analysis provided a mean FoS of 1.19 with 5.46% probability of failure. The FoS values and the locations of thecritical failure surface obtained by the limit equilibrium method and finite element method were compared. The observed FoSvalues were found to be higher than the values specified in the IS 7894-1975 (reaffirmed in 1997) and ANCOLD (1999). Inthe case of pseudo-static approach, the maximum displacement of 0.53 m was observed in the slope. Furthermore, nonlineardynamic stability analysis was performed to simulate a true earthquake event. The permanent deformation of the slope afterthe earthquake was found to be 0.40 m. The zone of failure observed in both pseudo-static and nonlinear dynamic stabilityanalyses was found to be the same. Overall, the results revealed that the spatial variability of the soil significantly influencesthe FoS values.