HR: 1340h
AN: H23B-1135    [Abstracts]
TI: Stress effects on the spectral electrical response of unconsolidated sediments.: Laboratory measurements and analyses
AU: * Gyamfi, J
EM: joseph.gyamfi@duke.edu
AF: Duke University, Box 90287, Durham, NC 27708
AU: Fred, B
EM: boadu@akoto.egr.duke.edu
AF: Duke University, Box 90287, Durham, NC 27708
AB: The relations between micro-structural changes in soils due to stress changes and modifications in electrical parameters describing the ir spectral electrical responses may be of interest to geoscientist concerned with non-invasive predictions of changes in strain and over-pressure conditions in the earth's subsurface. The spectral electrical responses and hydraulic properties of clay-sand mixtures saturated with water and subjected to varying stress levels in a laboratory environment are investigated and analyzed. The SER of soil mixtures are described with an equivalent circuit model considering the soils as heterogeneous multi-phase systems with grain contacts. The validity and usefulness of the relations between the electrical parameters and the soil texture were assessed using laboratory measurements of the spectral electrical response(0.01Hz to 10 kHz) of varying mixtures of sand and clay under varying stresses. The stress effects on the SER and how it is influenced by the micro-structural characteristics of the mixtures are also investigated and their effects on the hydraulic properties assessed.
DE: 5109 Magnetic and electrical properties
DE: 5139 Transport properties
DE: 5144 Wave attenuation
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting