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<br />33Z bploslves and Rock Blosting ~. <br />Selected panicle velocity damage criteria are listed as follows: <br />Lange(ars. Kihlstram. and Westerberg r (1957): <br />Panlr4l'rlari!r Dama.tr <br />2.g in. ste \o noticeable damage <br />A.7 in.'rec Fne cracks and fall of plasttr <br />6 t in. sec Cracking of plaster and <br />mamnrg Yalta <br />9.l in.'sec Serious cracking <br />Edtt'ards and \onhvood • based their criteria in connenion with the Sr. l.aarence <br />Project in Canada (19591: <br />Poflir lr l'r/rk'L I' ~ nanlate <br />5 ? in.~ Ste Saft: nn damage <br />1J IR: xC Ci Yllaa <br />>4in.~sre Damage <br />USBM (197111: <br />Parrirlr I'rlnrrn• DamaRr <br /><2.Oin.•ste ~odamege <br />2,O~a,O in. xee Plaster tracking <br />4.0.7.Oin.~see ~linordama(;e <br />> 7.0 in. see ~(ajor damage to alruclurt~ <br />i. <br />.I <br />~t <br />ll <br />Canmet. Hauer, and Calder "~ (1977) established damage for equipment and <br />structures: <br /> ParPi'/r trlorilr <br />Tryrr n/ Tfpr n~ aI aliirh <br />,Ylllr('Ilrrr flalOYQf llaalaYr .~'IaR] <br />Rigidll)' mnunttd Trip out 0.5 in.'sec <br />mercun~ sY'itches <br />Houses Plaster cracking 2 in. ste <br />ConeMt blacks Cracks In block gin. see <br />in • nevi home <br />Cased drill hnlea Horirontal of(xe I S in. xe <br />~lechanieal equipment. Shafts misaligned Min. ste <br />pumps, comprcsson <br />Pre(~brieated mewl Cracked pads, 60 in. ~ sec <br />building nn canertte building Iuisted <br />Pads and distorted <br />Fgure 11.7 illustrates that When the results of tatious researchers were <br />reduced to a common denominator. a peak particle veloein• of less than 2 in.'sec <br /> <br />