Journal
JOURNAL OF APPLIED GEOPHYSICS
Volume 105, Issue -, Pages 225-234Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jappgeo.2014.03.024
Keywords
Electrical conductivity/resistivity; Iron oxide coated soil; Archie's equation; Pore water conduction; Surface conduction; 4 electrode resistivity probe
Funding
- Georgia Institute of Technology
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This theoretical and experimental study investigated the applicability of Archie's equation to iron oxide coated soils as a function of pore water chemistry, with the ultimate goal of developing a relationship to estimate electrical conductivity based on the physical properties of soils. The study performed an experimental investigation to quantify the electrical properties of uncoated and lab-prepared iron oxide coated sands and clay, in order to evaluate the role of sorbed hematite on the measured electrical conductivity/resistivity of the soils. It was demonstrated that the observed conductivity/resistivity of hematite coated and uncoated clean sands showed good agreement under the tested salinities and iron contents, and both coated and uncoated sands could be represented by Archie's equation. In contrast, the electrical conductivity of iron oxide coated clay indicated a slightly higher value than that of clean kaolinite at low salinity due to the higher relevance of surface conduction: however, with further increase in salinity, the electrical properties of both coated and uncoated kaolinites were comparable and governed by pore water conduction, which agreed with the prediction from Archie's equation. (C) 2014 Elsevier B.V. All rights reserved.
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