Sonar imaging of flooded subsurface voids phase I : proof of concept.
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2011-04-15
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Abstract:Damage to Ohio highways due to subsidence or collapse of subsurface voids is a serious problem
for the Office of Geotechnical Engineering (OGE) at the Ohio Department of Transportation
(ODOT). These voids have often resulted from past underground mining activities for coal, clay,
limestone and gypsum but may also result from dissolution of bedrock as with karst formations.
These voids are flooded if they lie below the local drainage and may be partially flooded or open
if they lie above the local drainage. The effective depth of potential significant surface damage
resulting from subsidence of underground mines is generally regarded as 10 times the height of
the void (Piggot and Eynon 1978). However, in Ohio, mine voids are typically less than 5 ft.
high and show subsidence expressions to depths of 200 ft. or more.
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