Tailings Dam Reservoir Sectoring Using CPTU and Geophysical Test Data

DOI

10.2991/978-94-6463-104-3_20How to use a DOI?

Keywords

Tailings Dam Sectoring; CPTU tests; Quadrilatero Ferrifero

Abstract

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.

Copyright

© 2023 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Amanda Souza
AU  - Bruno Novais
AU  - Michel Fontes
AU  - Naiala Fidelis
PY  - 2023
DA  - 2023/03/01
TI  - Tailings Dam Reservoir Sectoring Using CPTU and Geophysical Test Data
BT  - Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022)
PB  - Atlantis Press
SP  - 229
EP  - 239
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-104-3_20
DO  - 10.2991/978-94-6463-104-3_20
ID  - Souza2023
ER  -