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Borehole Tomography and Surface 3D Radar for Coal Mine Subsidence Detection
ENSCO, Inc., 5400 Port Royal Road, Springfield, Virginia, USA U.S. Army Corps of Engineers, 502 Eighth Street, Huntington, West Virginia, USA | |
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ABSTRACT |
Experimental cross-hole and surface-penetrating radar surveys were conducted along a section of highway that had collapsed into underground coal mine workings. The cross-hole radar method provided information about bedrock and overburden conditions at depths not attainable using surface radar, while the surface radar enabled a detailed analysis of the roadway conditions. Through coincident analyses of borehole tomograms and surface three-dimensional plots, additional locations along the highway where mine-related disruption has occurred, and where a relatively high potential for future collapse exists, were detected. The results of this study demonstrate the applicability of radar methods to mine-related subsidence problems, and show that a more complete characterization can be achieved by employing both borehole and surface radar methods
KEYWORDS: GPR, radar, 3D, borehole, tomography, coal, subsidence, mining, geophysics
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