TIXOTROPIA: VARIAÇÃO DA RESISTÊNCIA AO CISALHAMENTO NÃO DRENADA DE UM SOLO ARTIFICIAL
TIXOTROPIA: VARIAÇÃO DA RESISTÊNCIA AO CISALHAMENTO NÃO DRENADA DE UM SOLO ARTIFICIAL
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DOI: https://doi.org/10.22533/at.ed.2402419073
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Palavras-chave: Caulim; Bentonita; Ensaio de palheta de laboratório; Razão de Resistência Tixotrópica; Razão de Resistência de Recuperação Tixotrópica.
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Keywords: Kaolin; Bentonite; Laboratory vane test; Thixotropic Resistance Ratio; Thixotropic Recovery Resistance Ratio.
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Abstract: This paper as carried out based on ideal proportions o kaolin and bentonite to geotechnically represent the soils of some of the main Brazilian offshore oil exploration fields. It was identified, through traditional geotechnical characterization tests and MCT using the Tablet Method, that the misture of 85% kaolin and 15% bentonite, in terms of dry weight and with a moisture content of 120%, is the best suitable for the proposed purpose. Laboratory vane tests were carried out with this mixture to evaluate the variation over time in the undrained shear strength of the artificial soil due to thixotropic effect. The tests were carried out between 1 hour and 240 days after molding. In summary, the results point to a significant gain in undrained shear strength up to approximately 100 days, when more than 90% og the Thixotropic Resistance Ratio was reached. The Thixotropic Recovery Resistance Ratio between the maximum and minimum times was 3.7. This value is considered low when compared to bentonite, but high compared to kaolin. Thus, the thixotropic behavior of the artificial soil is attributed to the presence expansive clay mineral, with a 2:1 structure, which even at a low level caused the effect evaluated on the mixture.
- KARINA RETZLAFF CAMARGO
- Ricardo Giumelli Marquezan
- Alexandre Felipe Bruch
- Marciano Carneiro