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

Weiner Gustavo Silva Costa, Dario Cardoso de Lima, Heraldo Nunes Pitanga, Carlos Ernesto Gonçalves Reynaud Schaefer, Taciano Oliveira da Silva, Claudio Henrique de Carvalho Silva


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.



column percolation; environmental geotechnics; permeability coefficient.

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DOI: http://dx.doi.org/10.4025/actascitechnol.v40i1.35052

ISSN 1806-2563 (impresso) e ISSN 1807-8664 (on-line) e-mail: actatech@uem.br


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