Evaluation of the effects of the hydraulic gradient variation on the permeability of a compacted soil

• Autor(a) principal: Costa, Weiner Gustavo Silva
• Data de Publicação: 2018
• Outros Autores: Lima, Dario Cardoso de, Pitanga, Heraldo Nunes, Schaefer, Carlos Ernesto Gonçalves Reynaud, Silva, Taciano Oliveira da, Silva, Claudio Henrique de Carvalho
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Acta scientiarum. Technology (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciTechnol/article/view/35052
• topic: column percolation; environmental geotechnics; permeability coefficient.; 3.01.03.03-7

The present study evaluated the influence of the hydraulic gradient on soil conductivity changes using data from permeability tests performed in a column percolation test system, in order to represent geoenvironmental engineering applications. A mature residual soil from gneiss, pedologically classified as Red-Yellow Latosol, with 67% of clay, 10% of silt, 23% of sand, 82% of liquid limit and 46% of plastic limit was used in the study. Soil specimens were compacted at the optimum compaction parameters determined at the Standard Proctor effort, i.e., wopt =31.37% and gdmax =13.54 kN m-3. After compaction, it was determined the permeability of specimens under the hydraulic gradients of 15, 66, 85 and 140. The results obtained support that: (i) at the 5% level, there is statistical significant variation in the permeability coefficient according to the hydraulic gradient used in the tests; (ii) from a geotechnical perspective, there is a slight tendency of increasing the permeability coefficient when increasing the hydraulic gradient, but of no significance for geotechnical practical applications.