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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 />c <br />v 2 <br />m <br />n <br />d <br />a <br />d <br />L <br />C 1.0 <br />I 0.8 <br />0.8 <br />U ~~~ <br />~ 0.6 <br />d <br />~ 0.5 <br />_d <br />0.4 <br />t <br />m <br />a <br />~ 0.3 <br />m <br />a <br />0.2 <br />/ K= 605 <br />i~ K= 24T <br />K= 24 <br />15 20 25 30 40 50 60 70 80 90100 <br />Scaled Ulstance - ft./Ib.'~= <br />0.1 <br />70 <br />~ ~ <br />~ T <br /> A <br /> <br /> <br />1 ~A~' <br />Ao ~ ~~ i <br />~ ~~ <br /> <br />~ ~ ~ <br /> oyL <br />i~ , <br /> ~i \ \ ~ o <br /> cP . ~ y ~ i <br /> w o ` n <br /> t <br />~ <br />3~ ~ <br /> y <br />\ <br />i i <br /> <br /> <br /> <br /> <br /> <br />o ~ 3 <br /> i P <br /> ' <br /> '~ / <br /> 0 ` <br /> A <br />7r <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/Ib~~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. (The Hanratry house is now owned by Summit Brick.} <br />15 <br />