Laserfiche WebLink
Review of Blasting Operations of Summit Brick <br />ANALYSES of BLASTING IMPACTS, cost' <br />Fig. 2.33 The Oriard Blast Vibration Curves <br />6 <br />5 <br />4 <br />3 <br />9 <br />C <br />~ 2 <br />4 <br />d <br />a <br />m <br />m <br />t <br />e Y.0 <br />I 0.9 <br />T 0.6 <br />U 0.7 <br />~ 0.6 <br />d <br />~ 0.5 <br />v <br />0 0.4 <br />t <br />a <br />se 0.3 <br />m <br />m <br />a <br />0.2 <br />/ K= 605 <br />i- K= 242 <br />X= 24 <br />15 20 25 30 40 50 60 70 60 90100 <br />Scaled Dlslance - 12./Ib.'~= <br />0.1 <br />70 <br /> <br />~ ~ <br /> 1 <br /> <br />` 4 <br /> ``` G ~L <br /> <br /> <br />QO `~ f/ <br />m <br />0 V' <br />~ <br /> ,. <br />r ~ ti <br />o <br /> i ~~ ~ ` <br />~c <br /> o„ ~ <br />w o <br /> ` <br />\ <br />~ ~O 9 <br /> y <br />~ <br />~. <br />0 <br />_~ <br />~ ~ <br />7 <br />A <br /> „3 o' ~ <br /> <br /> <br /> <br /> <br />O l .~ <br /> .. ' P <br /> ' '' <br /> ~ ~ ` <br /> e <br /> ~r ~ <br /> ` <br /> t <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. (1'he Hanratty house is now owned by Summit Brick.) <br />15 <br />