United States Department of Transportation
i
Use of electrical resistivity to detect underground mine voids in Ohio.
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2002-01-01
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Abstract:Electrical resistivity surveys were completed at
two sites along State Route 32 in Jackson and Vinton
Counties, Ohio. The surveys were done to
determine whether the electrical resistivity method
could identify areas where coal was mined, leaving
air- or water-filled voids. These voids can be local
sources of potable water or acid mine drainage.
They could also result in potentially dangerous
collapse of roads or buildings that overlie the
voids. The resistivity response of air- or waterfilled
voids compared to the surrounding bedrock
may allow electrical resistivity surveys to delineate
areas underlain by such voids.
Surface deformation along State Route 32 in
Jackson County led to a site investigation, which
included electrical resistivity surveys. Several
highly resistive areas were identified using axial
dipole-dipole and Wenner resistivity surveys. Subsequent
drilling and excavation led to the discovery
of several air-filled abandoned underground
mine tunnels.
A site along State Route 32 in Vinton
County, Ohio, was drilled as part of a mining permit
application process. A mine void under the
highway was instrumented with a pressure transducer
to monitor water levels. During a period of
high water level, electrical resistivity surveys were
completed. The electrical response was dominated
by a thin, low-resistivity layer of iron ore above
where the coal was mined out. Nearby overhead
powerlines also affected the results.
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