首页|Modified Complex Electrical Resistivity Technique: Applications to Saturated and Unsaturated Soils
Modified Complex Electrical Resistivity Technique: Applications to Saturated and Unsaturated Soils
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NETL
NSTL
Amer Soc Testing Materials
Direct current (DC) electrical resistivity is a common laboratory soil characterization method tosupport geotechnical infrastructure design and to supplement site investigations. The complexelectrical resistivity method has the potential to provide additional electrical soil properties toenhance electrical soil characterization. Both methods are conventionally performed underfully saturated soil conditions; however, many environments exist where soil is not fully saturated,such as ballast structure supporting railways. In this study, a new experimental setupfeaturing a current enhancing agent (agar) for complex electrical resistivity testing is evaluatedby testing five different soil specimens reconstituted at saturated and unsaturated conditions.Results showed that the new experimental setup is valid and can be used to obtain repeatmeasurements, particularly for specimens reconstituted in the unsaturated conditions wherethe traditional DC electrical resistivity setup yields results that are unreliable. This is one of thevery few studies where tolerances for triplicate specimens are reported to establish differencesin measurements from sample preparation versus discernable variability between differentgeomaterials. Additionally, all results are supported by a Cole-Cole model. The results showthat the additional data collected in a complex electrical resistivity test can be used to differentiatedifferent soil types that are ambiguous with the DC electrical resistivity method. Theadditional data have the potential to more fully characterize the electrical properties of saturatedand unsaturated soils, as well as to help distinguish unique geophysical signatures ofvarious geomaterials to enhance a geophysical site investigation for identifying soil variabilityin the subsurface.
complex electrical resistivityunsaturated soilsCole-Cole model
Kyle Parr、Stacey E. Kulesza、Michelle L. Bernhardt-Barry
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Department of Civil Engineering,Texas State University, 601University Dr., San Marcos, TX78666, USA
Department of Civil Engineering,University of Arkansas, 4190 BellEngineering Center, Fayetteville,AR 72701, USA
NETL
NSTL
Amer Soc Testing Materials
