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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 />17 <br />c <br />u 2 <br />m <br />d <br />a <br />d <br />t <br />C 1.0 <br />' 0,9 <br />0.6 <br />~ 0.7 <br />~ 0.6 <br />m <br />~ 0.5 <br />d <br />v 0.4 <br />L <br />w <br />a <br />w 0.3 <br />v <br />a <br />0.2 <br />K= 605 <br />~~ K= 242 <br />K= 24 <br />15 20 26 30 40 60 60 70 80 90100 <br />Scaled Dlalance - fl./Ib.'~~ <br />0.1 <br />70 <br />~ ~ <br /> <br /> i <br /> <br />` s <br /> `~~ G ~G <br /> <br />1 ~~~~ i <br />`~A <br /> An ~~ ~~ ~ ~ <br /> a~L ?i~ ` <br /> ~. \ \ ~ 4+ <br /> GP . ~ y ~ 1 - <br /> ~ ` O„ ` <br />\ <br />~ <br />~ o <br />~ <br /> ~i <br />y <br />~ <br />(1. <br />O„ _~ y <br />~ ~i <br />7~ <br /> ~ <br />'J O <br />' <br /> ~q ~ P <br /> ~ '~ <br /> ~ N / <br /> O <br /> ., ' A <br /> ' <br /> '~ ' <br /> 'l ` <br /> A <br /> 7~ ~` <br /> <br /> <br /> <br /> <br />Blasting regulations of the Colorado Dept. of Labor, make it a requirement that aIt blasters <br />use a minimum scaled distance of 55 ft/]b'~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. Hanratty house at the Fox Mine from the <br />permitted is approximately 1300 ft. (1'he Hanratty house is now owned by Summit Brick.) <br />15 <br />