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Airblast and Ground Vibration Generation and Propagation from Contour Mine Blasting.
Stachura-VJ; Siskind-DE; Kopp-JW
MISSING :31 pages
The Bureau of Mines studied airblast and ground vibrations produced by surface coal mine blasting in appalachia to determine the topographic or other region-specific effects on generation and propagation. Arrays of seismographs were used to measure blast effects in both rolling-terrain and steep-slope contour coal mining areas. Comparisons were then made with previous blasting data from studies of Midwest coal mines located in flat areas. Airblasts were found to have both higher average levels and higher spectral frequencies, consistent with expectations of less efficient blast confinement on the slopes. Topographic channeling of airblast was also observed, leading to more efficient propagation along the hollows or valleys. These two effects produced observed airblast levels higher by 1.9 to 4.4 Db than predicted from previous studies. Ground vibration levels, by contrast, were lower than found in flat- area coal mines. This is consistent with lesser degrees of confinement and the resulting greater blast relief. No specific topographic effect on ground vibration amplitudes was observed.
IH; Report of Investigations
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division