The Journal of Explosives Engineering - January/February 2015 - 32
Figure 2. 5,700 bench shot map.
Figure 3. 5,680 shot map.
127, 43 ft (13.1 m) holes, and 500 lbs (227 kg) of explosives
per hole. The seismograph reading next to the dozer had a
peak reading of 2.120 in/s (53.848 mm/s) at 26.9 Hz with
the lowest frequency of 21.3 Hz at 1.840 in/s (46.736 mm/s).
It was noted that normal blasting practices did send quite a
bit of material down the high wall. If this design was shot by
the dozer it would have covered the dozer with material and
potentially dislodged the dozer. See figure 2 for the location
of the blast on Dec. 4, 2012. It is the blast bordered in red.
The next two blasts were on the same bench as the first
with the same design and timing. These blasts are outlined in
pink (Dec. 5, 2012) and teal (Dec. 6, 2012) in figure 2. The
second shot had 161 holes (8 dead) and was 529 ft (161 m)
away from the dozer. This shot had a peak particle velocity of
32
0.210 in/s (5.334 mm/s) at 9.3 Hz with the lowest frequency
being 8.9 Hz at 0.180 in/s (4.572 mm/s). Little to no movement was reported from the scans for the material around the
dozer and the dozer itself. The blast showed a little stemming
ejection. This is very common when using detcord down the
hole as an initiator. The stemming ejection caused quite a bit
of fly material that was unwanted once we got closer to the
dozer. The third shot had 102 holes (6 dead) and was 251 ft
(77 m) away from the dozer. This shot had a PPV of 1.360 in/s
(34.544 mm/s) at 17.0 Hz with the lowest frequency being
10.2 Hz at 1.360 in/s (34.544 mm/s). The scans reported little
to no movement of the dozer from before the blast. In figure
6 the blast shows a little more violent stemming ejection.
Blast number four next to the dozer was a 20 ft (6 m) drop
The Journal of Explosives Engineering
January/February 2015
The Journal of Explosives Engineering - January/February 2015
Table of Contents for the Digital Edition of The Journal of Explosives Engineering - January/February 2015
From the Executive Director
Concrete Bridge Pier Removal in an Environmentally Sensitive River
Industry News
Chapter News
Calendar of Events
Explosives, 100 Years Ago, More or Less
The Recovery of a Dozer from a Highwall Using Blasting
Safety Talk
21st Annual Photo Contest
The Journal of Explosives Engineering - January/February 2015 - cover1
The Journal of Explosives Engineering - January/February 2015 - cover2
The Journal of Explosives Engineering - January/February 2015 - 1
The Journal of Explosives Engineering - January/February 2015 - 2
The Journal of Explosives Engineering - January/February 2015 - 3
The Journal of Explosives Engineering - January/February 2015 - From the Executive Director
The Journal of Explosives Engineering - January/February 2015 - 5
The Journal of Explosives Engineering - January/February 2015 - 6
The Journal of Explosives Engineering - January/February 2015 - 7
The Journal of Explosives Engineering - January/February 2015 - Concrete Bridge Pier Removal in an Environmentally Sensitive River
The Journal of Explosives Engineering - January/February 2015 - 9
The Journal of Explosives Engineering - January/February 2015 - 10
The Journal of Explosives Engineering - January/February 2015 - 11
The Journal of Explosives Engineering - January/February 2015 - 12
The Journal of Explosives Engineering - January/February 2015 - 13
The Journal of Explosives Engineering - January/February 2015 - 14
The Journal of Explosives Engineering - January/February 2015 - 15
The Journal of Explosives Engineering - January/February 2015 - 16
The Journal of Explosives Engineering - January/February 2015 - 17
The Journal of Explosives Engineering - January/February 2015 - Industry News
The Journal of Explosives Engineering - January/February 2015 - 19
The Journal of Explosives Engineering - January/February 2015 - 20
The Journal of Explosives Engineering - January/February 2015 - 21
The Journal of Explosives Engineering - January/February 2015 - Chapter News
The Journal of Explosives Engineering - January/February 2015 - 23
The Journal of Explosives Engineering - January/February 2015 - Calendar of Events
The Journal of Explosives Engineering - January/February 2015 - 25
The Journal of Explosives Engineering - January/February 2015 - Explosives, 100 Years Ago, More or Less
The Journal of Explosives Engineering - January/February 2015 - 27
The Journal of Explosives Engineering - January/February 2015 - 28
The Journal of Explosives Engineering - January/February 2015 - 29
The Journal of Explosives Engineering - January/February 2015 - The Recovery of a Dozer from a Highwall Using Blasting
The Journal of Explosives Engineering - January/February 2015 - 31
The Journal of Explosives Engineering - January/February 2015 - 32
The Journal of Explosives Engineering - January/February 2015 - 33
The Journal of Explosives Engineering - January/February 2015 - 34
The Journal of Explosives Engineering - January/February 2015 - 35
The Journal of Explosives Engineering - January/February 2015 - 36
The Journal of Explosives Engineering - January/February 2015 - 37
The Journal of Explosives Engineering - January/February 2015 - Safety Talk
The Journal of Explosives Engineering - January/February 2015 - 39
The Journal of Explosives Engineering - January/February 2015 - 40
The Journal of Explosives Engineering - January/February 2015 - 41
The Journal of Explosives Engineering - January/February 2015 - 42
The Journal of Explosives Engineering - January/February 2015 - 43
The Journal of Explosives Engineering - January/February 2015 - 21st Annual Photo Contest
The Journal of Explosives Engineering - January/February 2015 - 45
The Journal of Explosives Engineering - January/February 2015 - 46
The Journal of Explosives Engineering - January/February 2015 - 47
The Journal of Explosives Engineering - January/February 2015 - 48
The Journal of Explosives Engineering - January/February 2015 - cover3
The Journal of Explosives Engineering - January/February 2015 - cover4
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