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Filtration tests under confinement on geotextiles-tailings systems
Non woven geotextiles have been commonly used in filtration and drainage of geotechnical engineering works. In spite of their practical advantages, the use of such materials in drainage systems of tailings dams requires some particular investigations for a proper evaluation of their performances under the conditions found in such works, such as high stress levels, mechanical damage and chemical aggressiveness of the fluid. This paper presents a study on the use of such materials in drainage systems of tailings dams. Different combinations of tailings and geotextiles were submitted to gradient ratio tests under confinement in the laboratory with varying values of stress levels and hydraulic gradients. The dimensions of the tailings particles entrapped in the geotextile specimens and those that piped through the geotextile were also investigated. Geotextile specimens from the drainage system of a tailings dam were exhumed for analyses as part of the research programme. The GR (gradient ratio) test was a useful tool for the investigation of the soil-geotextile compatibility in filtration. The results obtained showed that stress levels and the hydraulic gradients used in the tests influenced the behaviour of the system. Physical and microscopic analyses of the specimens tested in the laboratory and exhumed from the dam showed different levels of geotextile impregnation by the particles of the tailings. The overall performances of the geotextiles in the tests were satisfactory, and they presented stable behaviour during the tests.
Filtration tests under confinement on geotextiles-tailings systems
Non woven geotextiles have been commonly used in filtration and drainage of geotechnical engineering works. In spite of their practical advantages, the use of such materials in drainage systems of tailings dams requires some particular investigations for a proper evaluation of their performances under the conditions found in such works, such as high stress levels, mechanical damage and chemical aggressiveness of the fluid. This paper presents a study on the use of such materials in drainage systems of tailings dams. Different combinations of tailings and geotextiles were submitted to gradient ratio tests under confinement in the laboratory with varying values of stress levels and hydraulic gradients. The dimensions of the tailings particles entrapped in the geotextile specimens and those that piped through the geotextile were also investigated. Geotextile specimens from the drainage system of a tailings dam were exhumed for analyses as part of the research programme. The GR (gradient ratio) test was a useful tool for the investigation of the soil-geotextile compatibility in filtration. The results obtained showed that stress levels and the hydraulic gradients used in the tests influenced the behaviour of the system. Physical and microscopic analyses of the specimens tested in the laboratory and exhumed from the dam showed different levels of geotextile impregnation by the particles of the tailings. The overall performances of the geotextiles in the tests were satisfactory, and they presented stable behaviour during the tests.
Filtration tests under confinement on geotextiles-tailings systems
Beirigo, E.A. (author) / Palmeira, E.M. (author) / Gardoni, M.G. (author)
2006
4 Seiten, 8 Bilder, 1 Tabelle, 7 Quellen
Conference paper
Storage medium
English
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