United States Department of Transportation
i
Dalton Highway 9 to 11 Mile Expedient Resistivity Permafrost Investigation
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2014-01-01
[PDF-2.29 MB]
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Abstract:This project performed capacitive coupled resistivity surveys over a roadway reconstruction project in Interior Alaska, for the determination of permafrost extent. The objective was to ascertain the ability of an expedient earth resistivity survey system to effectively obtain permafrost information to be utilized for design. This section of roadway traverses ice-rich discontinuous permafrost terrain, and to prevent costly long term thaw-settlement, thermal mitigation was included in the form of subsurface extruded polystyrene rigid board insulation. To insure optimal installation of the thermal protection, an effective method was needed to determine the location and depth of frozen soil. Two transects were surveyed along the existing roadway surface for nearly the full length of the project. In addition, continuous soil samples were drilled at select portions of the project for ground-truth of the survey results. Lastly, sub-grade soils samples were collected during excavation of the ice-rich cuts areas for further correlation with survey results.
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