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tiOt13 pl'n~9dC Illnr( PPti1tiltlnCC to fl(IVtI1tCing p11C5 and Utemforc };cnc•ralr, hiRhcr atbration <br />Figure 3. Expected Vibration Lovols Generatod <br />by a 68.000 J (50,000 ft Ibf) Impact Pile Driver <br />IS 1- - <br /> <br />} <br />U .~ _- 1 _ <br />i I. <br />_. <br />~ <br />•I - <br /> <br />.; I i <br />E ~ k = 1.17 i <br />E 1e (clayey soil) ~ ~ ~ ~ • <br /> <br />y . ~ ~ <br />V = V,(O,ID,' <br />? ~ I k = 1.12 '~ where: <br />a ~ (sandylallt - - V = Vib. Level al distance D ~ - <br />e. <br />i d - soil) - <br />1 - V, = Rel. Vlb. Level at 7.b m - <br /> <br />t D,=7.5m=Rof.D _ <br />5 ~ ~ - ~ k =Soil Paramotor ~ - <br />Y <br />O ~ <br />^r <br />i <br />- ~ <br />6 ( _ <br /> ` IJ <br />I I <br />1 r <br />ff <br />~ I I I <br />1 <br /> <br />p _ . <br /> • N r ~ N n h N N n N N <br />n N n <br />N ~i •1 ~ N IH N N n N n N n N <br />(O P N f ,l1 n m O I.1 <br /> <br /> Dh tame Irom PIN Orlvo r, m <br />Ievris near t he source than thosr in s:tnflc soils. Vibrations in clay soils, however, tend <br />to drop off m ore rapidly with dista nce than those in sandy sods. <br />Frequcnry ranges of constructio n vibrations, (including pile drivmgl tend to be the <br />same as for traffic vibrations. m ostly in the 10-30 Hz range, centered around l5 liz, <br />once in a w hile lowrr Than 1(1 Ilz, and ntrek highrr than 30 Hz. <br />lL ~~ <br />I r. <br />