Research Papers

Identifying underground coal mine displacement through field and laboratory laser scanning

[+] Author Affiliations
Brent Slaker

Virginia Polytechnic Institute and State University, 100 Holden Hall, 445 Old Turner Street, Blacksburg, Virginia 24061, United States

Erik Westman

Virginia Polytechnic Institute and State University, 100 Holden Hall, 445 Old Turner Street, Blacksburg, Virginia 24061, United States

J. Appl. Remote Sens. 8(1), 083544 (Oct 21, 2014). doi:10.1117/1.JRS.8.083544
History: Received July 7, 2014; Revised September 10, 2014; Accepted September 29, 2014
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Abstract.  The ability to identify ground movements in the unique environment of an underground coalmine is explored through the use of laser scanning. Time-lapse scans were performed in an underground coal mine to detect rib surface change after different volumes of coal were removed from the mine ribs. Surface changes in the rib as small as 57cm3 were detected through analysis of surface differences between triangulated surfaces created from point clouds. Results suggest that the uneven geometry, coal reflectance, and small movements of objects and references in the scene due to ventilation air do not significantly influence monitoring ability. Time-lapse scans were also performed on an artificial coal rib constructed to allow the researchers to control deformation and error precisely. A test of displacement measurement precision showed relative standard deviations of <0.1% are attainable with point cloud densities of >3200pts/m2. Changing the distance and angle of incidence of the artificial coal rib to the scanner had little impact on the accuracy of results beyond the expected reduction due to a smaller point density of the target area. The results collected in this study suggest that laser scanning can be a useful, comprehensive tool for measuring ground change in an underground coal mining environment.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Brent Slaker and Erik Westman
"Identifying underground coal mine displacement through field and laboratory laser scanning", J. Appl. Remote Sens. 8(1), 083544 (Oct 21, 2014). ; http://dx.doi.org/10.1117/1.JRS.8.083544


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