Banca de DEFESA: Alessandra dos Santos Gomes

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Alessandra dos Santos Gomes
DATE: 14/09/2022
TIME: 08:30
LOCAL: TEAMS
TITLE:

Analyses of Static Liquefaction Triggers in a Tailing Dam

KEY WORDS:

Tailing dam; Norsand; Mining; Decommisioning.

PAGES: 90
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Tailings dam failures are very common all over the world. Accidents such as the Fundão Dam, in Mariana and I Dam of the Córrego do Feijão Mine, in Brumadinho, both in Minas Gerais, Brazil, are among the most serious disasters recorded in Brazil in terms of human costs, social, environmental and economic. Since these mentioned ruptures and many others occurred in tailings dam were performed using the upstream method, the National Mining Agency published resolution nº 04/2019, which prohibits the use of this method throughout the national territory. In order to evaluate liquefaction triggers that can cause the failure of this type of dam, in this work, chose to use the Norsand constitutive model to represent the tailings behavior, given that the models generally available in commercial software do not allow considering the dilatant or contractile behavior of the material. For this, the calibration of the material was performed, in which a satisfactory result was obtained. The values obtained for the parameters from the calibration were used for the simulations of the liquefaction triggers, in which the possible displacement of the initial dike and elevations, induced by the reduction of strength, the elevation of the water level and the excavation of the reservoir and the elevations were simulated. The occurrence of liquefaction was verified by simulating the considered liquefaction triggers, through the stress trajectories and the normalized stress rate. 

BANKING MEMBERS:
Externo à Instituição - IGOR FERNANDES GOMES
Presidente - 1549489 - MANOEL PORFIRIO CORDAO NETO
Interno - 3132829 - RAFAEL CERQUEIRA SILVA