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Review of Blasting Operations of Summit Brick <br />ANALYSES of BLASTING IMPACTS, cont' <br />Fig. 2.3; The Oriard Blast Vibration Curves <br />6 <br />5 <br />4 <br />3 <br />v <br />c <br />~ 2 <br />a <br />d <br />L <br />C 7.0 <br />0.9 <br />0.8 <br />u 0.7 <br />~ 0.6 <br />a <br />~ 0.5 <br />m <br />~ 0.4 <br />r <br />W <br />a <br />.x 0.3 <br />m <br />a <br />a.2 <br />/ K= 605 <br />~- 'K= 242 <br />K= 24 <br />15 20 25 30 40 50 60 70 80 90100 <br />Scaled Distance - fl./Ib.'~= <br />0.1 <br />10 <br /> <br />~ ~ <br /> y <br /> A <br /> `~: G ~c~` <br /> y 4A~^: <br />~ ~ ~~4io <br /> ~ <br /> m~ a, <br />`~~ ~ y <br />~"~~ <br /> GP . ~ y <br />~ 1 <br /> ~ <br />°.. ` o <br /> ~~ <br />\Z ~\'~S~ <br />, _~ <br />O i <br />~~ q <br />~ i <br />~N <br /> ~ <br />~ <br /> <br /> <br /> 0 <br /> <br /> ' ~ <br />' <br /> x" ~ r <br /> 9 ~ <br /> e <br />~r <br /> <br /> <br /> <br /> <br /> <br />Blasting regulations of the Colorado Dept. of Labor, make it a requirement that all blasters <br />use a minimum scaled distance of 55 ft/lb'~2 when calculating maximum charge weights. <br />To insure that blast induced ground motion does not approach the level, which might <br />cause even the slightest damage, the above formula and curve is used to set charge weights. <br />For an example, the scaled distance for the B. Hanratry house at the Fox Mine from the <br />permitted is approximately 1300 ft. (T'he Hanratry house is now owned by Summit Brick.) <br />]5 <br />