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Sonar imaging of flooded subsurface voids. Phase 1, Proof of concept : final report

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Title	Sonar imaging of flooded subsurface voids. Phase 1, Proof of concept : final report
Subject	voids,equipment,downhole,sonar,borehole,investigation,camera,scanning; TN319.F69 2011x; Abandoned mines--Ohio.; Mine subsidences--Ohio.; Mine surveying--Ohio--Equipment and supplies.; Sonar.; OTP 1.23/7:2011-08
Description	"Prepared in cooperation with the Ohio Department of Transportation and the U.S. Department of Transportation, Federal Highway Administration."; Research agency: The Ohio State University Research Foundation.; "April 15, 2011."; "FHWA/OH-2011/8--Cover.; Includes bibliographical references (p. 22-23).; For the Ohio Dept. of Transportation, Office of Research and Development; State job no. 134301
Creator	Fox, Patrick J. (Patrick Joseph)
Publisher	Ohio Dept. of Transportation
Contributors	Ohio State University. Research Foundation.; Ohio. Dept. of Transportation. Office of Research and Development.; United States. Federal Highway Administration.
Type	Text
Language	eng
Relation	Also available online.; http://www.dot.state.oh.us/Divisions/Planning/SPR/Research/reportsandplans/Reports/2011/Structures/134301-FR.pdf; http://worldcat.org/oclc/782061791/viewonline; http://www.dot.state.oh.us/Divisions/Planning/SPR/Research/reportsandplans/Reports/2011/Structures/134301-ES.pdf
Description-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. Since past records are of little use to establish the location of underground voids, subsurface investigation and grouting methods essentially consist of a random or grid-based drilling pattern. This method is expensive because many unusable holes are drilled into existing pillars, walls and unmined areas. Considerable savings of time and drilling costs can be achieved if more information on void geometry can be obtained prior to drilling. Even for mapped mines, there is still a need to verify the location of the map relative to existing surface features and design layouts. Downhole cameras and laser scanning are suitable for open voids but are of little use for the majority of voids that are flooded and may have persistent turbidity in the water. Due to the potential cost savings, the ODOT OGE is interested in the acquisition or development of downhole void investigation and mapping equipment capabilities. ODOT funded this Phase I project to investigate the feasibility to develop equipment with such capabilities to improve the quality and efficiency of ODOT's subsurface void investigation program. This report presents the findings of this Phase I investigation and makes recommendations concerning Phase II implementation.
Date-Issued	2011]
Format-Extent	[iii], 31, [11] p. : ill. (chiefly col.) ; 28 cm.
Format-Medium	Government Publication
OCLC number	782061791

Title	Page 1 Sonar imaging of flooded subsurface voids. Phase 1, Proof of concept : final report
Subject	voids,equipment,downhole,sonar,borehole,investigation,camera,scanning; TN319.F69 2011x; Abandoned mines--Ohio.; Mine subsidences--Ohio.; Mine surveying--Ohio--Equipment and supplies.; Sonar.; OTP 1.23/7:2011-08
Description	"Prepared in cooperation with the Ohio Department of Transportation and the U.S. Department of Transportation, Federal Highway Administration."; Research agency: The Ohio State University Research Foundation.; "April 15, 2011."; "FHWA/OH-2011/8--Cover.; Includes bibliographical references (p. 22-23).; For the Ohio Dept. of Transportation, Office of Research and Development; State job no. 134301
Creator	Fox, Patrick J. (Patrick Joseph)
Publisher	Ohio Dept. of Transportation
Contributors	Ohio State University. Research Foundation.; Ohio. Dept. of Transportation. Office of Research and Development.; United States. Federal Highway Administration.
Type	Text
Language	eng
Relation	Also available online.; http://www.dot.state.oh.us/Divisions/Planning/SPR/Research/reportsandplans/Reports/2011/Structures/134301-FR.pdf; http://worldcat.org/oclc/782061791/viewonline; http://www.dot.state.oh.us/Divisions/Planning/SPR/Research/reportsandplans/Reports/2011/Structures/134301-ES.pdf
Description-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. Since past records are of little use to establish the location of underground voids, subsurface investigation and grouting methods essentially consist of a random or grid-based drilling pattern. This method is expensive because many unusable holes are drilled into existing pillars, walls and unmined areas. Considerable savings of time and drilling costs can be achieved if more information on void geometry can be obtained prior to drilling. Even for mapped mines, there is still a need to verify the location of the map relative to existing surface features and design layouts. Downhole cameras and laser scanning are suitable for open voids but are of little use for the majority of voids that are flooded and may have persistent turbidity in the water. Due to the potential cost savings, the ODOT OGE is interested in the acquisition or development of downhole void investigation and mapping equipment capabilities. ODOT funded this Phase I project to investigate the feasibility to develop equipment with such capabilities to improve the quality and efficiency of ODOT's subsurface void investigation program. This report presents the findings of this Phase I investigation and makes recommendations concerning Phase II implementation.
Date-Issued	2011]
Format-Extent	[iii], 31, [11] p. : ill. (chiefly col.) ; 28 cm.
OCLC number	782061791

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