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1TABILIL.Tb5 5 <br /> o i" \ 0 <br /> ROCK SOLID <br /> SOLUTIONS <br /> Safe Level Blasting Criteria <br /> ............ USBM RI 8507 <br /> - OSM REGULATIONS <br /> 01110 10 rsiritt•-ta.. <br /> a�riritifi rid . <br /> a�t�tit�te-ti.. ����� <br /> 11111111 <br /> 1--11 <br /> 111 <br /> 100 <br /> 4 _ <br /> V <br /> 3 a) <br /> N <br /> ram/) 2 , <br /> I' 111 • AIIIIII Y <br /> 1111111116d11111111 <br /> si to 3 1111111111 <br /> Co <br /> I a a 1111111 au 4 <br /> 0.1 <br /> 2 3 4 5 6 7 N 910 2 3 4 5 6 7 6 9 <br /> 1 100 <br /> Frequency (Hz) <br /> Expected Ground Vibration <br /> When an explosive is detonated in the ground,three types of seismic waves are generated com- <br /> pressive.shear and surface.These waves can result in structure response and on rare occasions, <br /> structure damage.Extensive research has provided for safe blasting criteria based on peak particle <br /> velocity measured from the wave event.Peak particle velocity(PPV)values can be estimated using <br /> the following formulas. <br /> • <br /> J unds per delay1.6 (Jkilograms per delay 11.6 <br /> PPV=( feet to seismograph x H PPV= meters to seismograph/ x H <br /> Where: Where. <br /> PPV=Peak particle velocity(inisec) PPV=Peak particle velocity(mm/sec) <br /> H=Ground response factor H=Ground response factor <br /> "H"Factors "H"Factors <br /> Lower limit,little or no confinement 24.2 Lower limit,little or no confinement 172 <br /> Average value,typical confinement 160 Average value,typical confinement 1140 <br /> Upper limit,heavy confinement 242 Upper limit.heavy confinement 1725 <br /> eys* al x. <br /> ROCK SOLID <br /> SOLUTIONS <br />