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Tailings Dam Reservoir Sectoring Using CPTU and Geophysical Test Data
The need for stabilization of a dam located at Quadrilatero Ferrifero, located at the Southern of Craton São Francisco, in Brazil, demanded geological-geotechnical studies that made possible the building of a geological model that reflects the behavior and distribution of sediments deposited within the reservoir. The structure was built in an embedded valley, on residual shale soil and, more locally, over a layer of iron ore tailings between 8.0 and 9.0 m thick.
To develop the model, boreholes were drilled to identify and characterize the material within the reservoir and CPTU tests were performed to obtain the geotechnical behavior of the materials. Based on these investigations, it was possible to establish a sectorization of the tailings within the reservoir, allowing a more reliable assessment of the dam’s stability and identifying the regions vulnerable to liquefaction. The different tailings groups would have been deposited in a similar way to the deposition of sediments, described by the Krubein and Sloss sequence stratigraphy theory in 1963.
The integration of the results of the electroresistivity geophysical surveys with the geological-geotechnical sections assisted the elaboration of the proposed geological model. The geophysical data indicated the possible regions where the tailings would be saturated, favoring water. The areas that presented lower resistivities coincide with the areas where the CPTU tests indicated the presence of a tailings with clayey behavior (saturated) and the areas of more sandy tailings coincide with the regions of intermediate resistivity.
Tailings Dam Reservoir Sectoring Using CPTU and Geophysical Test Data
The need for stabilization of a dam located at Quadrilatero Ferrifero, located at the Southern of Craton São Francisco, in Brazil, demanded geological-geotechnical studies that made possible the building of a geological model that reflects the behavior and distribution of sediments deposited within the reservoir. The structure was built in an embedded valley, on residual shale soil and, more locally, over a layer of iron ore tailings between 8.0 and 9.0 m thick.
To develop the model, boreholes were drilled to identify and characterize the material within the reservoir and CPTU tests were performed to obtain the geotechnical behavior of the materials. Based on these investigations, it was possible to establish a sectorization of the tailings within the reservoir, allowing a more reliable assessment of the dam’s stability and identifying the regions vulnerable to liquefaction. The different tailings groups would have been deposited in a similar way to the deposition of sediments, described by the Krubein and Sloss sequence stratigraphy theory in 1963.
The integration of the results of the electroresistivity geophysical surveys with the geological-geotechnical sections assisted the elaboration of the proposed geological model. The geophysical data indicated the possible regions where the tailings would be saturated, favoring water. The areas that presented lower resistivities coincide with the areas where the CPTU tests indicated the presence of a tailings with clayey behavior (saturated) and the areas of more sandy tailings coincide with the regions of intermediate resistivity.
Tailings Dam Reservoir Sectoring Using CPTU and Geophysical Test Data
Atlantis Highlights in Engineering
Javankhoshdel, Sina (editor) / Abolfazlzadeh, Yousef (editor) / Souza, Amanda (author) / Novais, Bruno (author) / Fontes, Michel (author) / Fidelis, Naiala (author)
TVSeminars and Mining One International Conference ; 2022 ; Toronto, ON, Canada
Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022) ; Chapter: 20 ; 229-239
2023-02-26
11 pages
Article/Chapter (Book)
Electronic Resource
English
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