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Tailings Dam’s Safety Assessment Considering Undrained Foundation Failure
During construction and raising phases of tailings dams, excess pore pressures and localized deformations (plasticization zones) may develop due to applied overloads. Therefore, it can develop an undrained shearing in contractile materials, as tailings and foundation soils. In this case, the design of these structures must consider, in its studies, the failure by undrained shearing of the foundation as a potential trigger for static liquefaction of tailings. In Brazil, National Mining Agency - Resolution No. 13 set a minimum safety factor equal to 1.3 for stability analyzes and studies of liquefaction susceptibility considering peak undrained shear strength. In this context, the present work aims to present the safety assessment of a hypothetical tailing dam, for an undrained scenario (which was considered even for the foundation), in view of the main consolidated methodologies in the geotechnical community, for shear resistance parameters estimation. The stability analyses were developed in 2-D and 3-D, by limit equilibrium method. The results indicated overestimated factors of safety when considering effective strength parameters for the foundation, reinforcing the importance of carefully evaluating the type of mechanical behavior of soils under shearing.
Tailings Dam’s Safety Assessment Considering Undrained Foundation Failure
During construction and raising phases of tailings dams, excess pore pressures and localized deformations (plasticization zones) may develop due to applied overloads. Therefore, it can develop an undrained shearing in contractile materials, as tailings and foundation soils. In this case, the design of these structures must consider, in its studies, the failure by undrained shearing of the foundation as a potential trigger for static liquefaction of tailings. In Brazil, National Mining Agency - Resolution No. 13 set a minimum safety factor equal to 1.3 for stability analyzes and studies of liquefaction susceptibility considering peak undrained shear strength. In this context, the present work aims to present the safety assessment of a hypothetical tailing dam, for an undrained scenario (which was considered even for the foundation), in view of the main consolidated methodologies in the geotechnical community, for shear resistance parameters estimation. The stability analyses were developed in 2-D and 3-D, by limit equilibrium method. The results indicated overestimated factors of safety when considering effective strength parameters for the foundation, reinforcing the importance of carefully evaluating the type of mechanical behavior of soils under shearing.
Tailings Dam’s Safety Assessment Considering Undrained Foundation Failure
Atlantis Highlights in Engineering
Javankhoshdel, Sina (editor) / Abolfazlzadeh, Yousef (editor) / Padovani, Flávia Augusta (author) / Bretas, Thiago (author)
TVSeminars and Mining One International Conference ; 2022 ; Toronto, ON, Canada
Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022) ; Chapter: 5 ; 44-52
2023-02-26
9 pages
Article/Chapter (Book)
Electronic Resource
English
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