Abstract

Using a multiconductor electrode cable and a 30-post switching system, pole-dipole electrical resistivity measurements with a linear electrode array demonstrated a strong correlation between resistivity anomalies and subsurface voids at four sites in Florida. Solution cavities below the water table are filled with a groundwater-solute mixture characterized by lower electrical resistivity than the enclosing country rock (Eocene and younger limestone). Air-filled cavities above the water table exhibit high resistivity anomalies. Confirmation drilling of postulated cavities and other anomalies suggests the method can be used with confidence to locate highway-threatening solution cavities with diameters as small as 3 to 5 m to a depth of 25 to 30 m.--Modified journal abstract.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.