Comparative study of blasting vibrations from Indiana surface coal mines
The U.S. Bureau of Mines performed a comparative study of nine sites at eight surface coal mines to determine if the presence of near-surface underground abandoned workings resulted in the generation of adverse long-duration, low-frequency blast vibrations. Six of the nine sites had underlying workings, and two had thick layers of low-velocity unconsolidated surface material. Extended seismic arrays were used to identify the vibration characteristics within a few tens of feet of the blasts and also as modified by the propagating media at distances over 1 mile. Production blasts and specially fired single-charge blasts allowed the determination of natural ground frequency and the influence of initiation delay timing. Vibration amplitudes from the production blasts at all sites exceeded historical norms, particularly at the greater distances. This contrasts with the near-normal results from single-charge blasts.
- OSTI ID:
- 7271146
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL MINES
BLAST EFFECTS
SURFACE MINING
EXPLOSIVE FRACTURING
ABANDONED SITES
COMPARATIVE EVALUATIONS
GROUND MOTION
SEISMIC DETECTION
SHOCK WAVES
COMMINUTION
DETECTION
FRACTURING
MINES
MINING
MOTION
UNDERGROUND FACILITIES
012020* - Coal
Lignite
& Peat- Surface Mining- (1987-)