Laserfiche WebLink
Review of Blasting Operations of Summit Srick <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 />v 2 <br />d <br />v <br />a <br />tll <br />d <br />L <br />C 1.0 <br />1 0.9 <br />T 0.8 <br />U 0.7 <br />~ ~.$ <br />~ 0.5 <br />at <br />U 0.4 <br />t <br />W <br />a <br />~ 0.3 <br />v <br />0. <br />0.2 <br />K= 605 <br />J- K= 242 <br />X= 24 <br />15 20 25 30 40 50 60 70 8090100 <br />Scaled Distance - ft./Ib.'~~ <br />0.1 <br />70 <br />~ ~ <br /> <br /> 1 <br /> 4 <br /> `\ C' ~6 <br /> i \A'9^: ' ~~io <br />v <br /> <br /> ~ ~~ ,y <br />`~ <br /> ~ <br />y ` <br />'~~ <br />..o <br /> <br /> Q -~ C 1 CA <br /> <br />~ <br />' I <br /> ~ ~ ~ <br /> 7 <br />~ ~ <br /> ~ P / <br /> 0 o <br /> y <br /> <br /> <br /> <br /> W <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/1b~~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. (The Hanratty house is now owned by Summit Brick.) <br />15 <br />