Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Mine roof vibrations from underground blasts.

Authors
Olson-JJ; Dick-RA; Condon-JL; Hendrickson-AD; Fogelson-DE
Source
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 7330, 1970 Jan; :1-55
Link
NIOSHTIC No.
10000904
Abstract
Previous Bureau of Mines studies of vibrations from quarry blasts have shown that the square root of the charge weight may be used to group particle velocity data from various charge sizes, and that empirical propagation equations may be used to estimate vibration amplitudes. Particle accelerations of the sandstone roof of the White Pine Copper Mine, Michigan, were measured to determine whether similar propagation equations may be developed for underground mine blasts. Vibration data from White Pine blasts were best grouped by scaling with the square root of the charge weight. Cube root scaling did not effectively group the data. The empirical propagation equation aw1/2 = 50,000 (r/w1/2)-2.21, Where a is peak- to-peak acceleration in g's, w is the zero-delay charge weight in pounds, and r is the distance from the blast in feet, may be used to estimate maximum vibration amplitudes from production sized blasts. Vibration differences among headings and types of explosive charge (AN-FO and dynamite), while statistically significant, were n t a major factor in the estimation of maximum vibration amplitudes with an empirical propagation equation. Vibration differences between types of explosive charge were larger than the differences among headings, indicating that some reduction of vibration amplitude might be gained by using AN-FO rather than dynamite.
Keywords
Mining-industry; Underground-mining; Vibration; Explosions; Blasting-agents
Publication Date
19700101
Document Type
IH; Report of Investigations
Fiscal Year
1970
NTIS Accession No.
PB-190032
NTIS Price
A05
Identifying No.
RI-7330
NIOSH Division
TCRC
Source Name
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, RI 7330
State
MN; MI
TOP