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Mine Roof Vibrations from Production Blasts, Shullsburg Mine, Shullsburg, Wisconsin.

Authors
Olson-JJ; Dick-RA; Fogelson-DE; Fletcher-LR
Source
NTIS: PB 196 689 :35 pages
Link
NIOSHTIC No.
10001677
Abstract
The Bureau of Mines recorded both particle accelerations and velocities from one-stick and production blasts at Eagle-Picher Industries' Shullsburg Mine, Shullsburg, Wisconsin, to test the effectiveness of square root scaling in grouping underground blast vibrations and to determine the effects of rock type and mine geometry on blast vibrations. Although the charge weights of subsequent delay periods sometimes exceeded the charge weight of the zero-delay period, both acceleration and velocity records showed that the zero-delay portion of the shullsburg production blasts produced the highest vibration amplitudes. Because of the restricted range of charge weights in the shullsburg experiments, no statistical determination of an appropriate scaling factor could be made. However, the square root scaled peak particle velocity data from the shullsburg production blasts grouped well within the approximate band width of vibration data obtained by the Bureau from quarry blasts in many different rock types. This indicates that scaling by some factor, perhaps the square root or cube root of the charge weight, may be an effective way to group and study vibration data from underground blasts. Further research is needed to determine which scaling factor is best for underground blasting.
Publication Date
19700101
Document Type
IH; Report of Investigations
Fiscal Year
1970
NTIS Accession No.
PB-196689
NTIS Price
A04
Identifying No.
RI 7462
NIOSH Division
TCRC;
Source Name
NTIS: PB 196 689
State
WI;
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