Abstract
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., w opt =31.37% and g dmax =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.
Highlights
Among the laboratory tests for geoenvironmental applications, column percolation is commonly applied in the study of transport of contaminants in fine soils
From the geotechnical perspective, there is need of characterizing the influence of the hydraulic gradient used in column percolation tests on soil structure
Considering the influence of the hydraulic gradient on the hydraulic responses of this material (Daniel, 1994; Shackelford & Glade, 1994; Ke & Takahashi, 2012; Steiakakis, Gamvroudis, Komodromos, & Repouskou, 2012; Al-Taie, Pusch, & Knutsson, 2014), this study addressed the influence of the hydraulic gradient on permeability of a compacted clayey soil
Summary
Among the laboratory tests for geoenvironmental applications, column percolation is commonly applied in the study of transport of contaminants in fine soils. These tests are performed on laboratory equipment which employs relatively low hydraulic gradients and, in the case of the study of contaminants, requires long times for execution. From the geotechnical perspective, there is need of characterizing the influence of the hydraulic gradient used in column percolation tests on soil structure.
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