Highway Damage Due to Subsidenceby Shad M. Sargand, Ohio State Univ, Athens, OH, USA,
Glenn A. Hazen, Ohio State Univ, Athens, OH, USA,
Abstract: In this study subsidence profiles over three longwall panels, which were mined beneath state highways in Southeastern Ohio, were obtained. Immediate and short term subsidences were recorded. A video camera probe was lowered into two core holes before and after longwall mining took place, and visual inspections were performed to examine the nature of cracking. A laboratory investigation was conducted to determine the strength and elastic properties of rock strata above the mine. Displacements and strains predicted by the National Coal Board of Britain (NCB) graphical method and by the profile method using empirical constants determined for the Appalachian Region were compared with the field measurements. The NCB method predicts a conservative subsidence trough. Excellent subsidence agreement was found with the profile method. Neither method adequately predicts strains. Surface and strata cracking revealed a definite pattern with respect to mining, stratigraphy, and topography.
Subject Headings: Land subsidence | Highways and roads | Rock properties | Damage (structural) | Mines and mining | Strain | Stratigraphy | Surface properties | Cracking | North America | Ohio | United States
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