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150_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

150_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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DF25 Foru VEAlo 1\ , \ ~--'--J , ',' --- \_- ., , 10011'''' = the force in the pile = the particle velocity in the pile EA = = - = peA = the pile impedance, a proportionality conslant c = Ihe pile modulus or stiffness = the pile cross-sectional area = the wave speed (= 16,800 lVs in steel, 10·13,000 lVs in concrete) = the mass density of the pile z v How a Pile is "Driven" o the pile penetrates the soil as the kinetic energy of the moving ram is transferred to it (conservalion of energy - bUI many losses: esp. friction and heat) o transmission of energy from hammer to pile is not instantaneous o the force on the pile head varies during hammer impact (duration 50·150 ms) o ~mmer impact compresses the pile head and this zone of compression travels "('"propagates") down the pile at a wave speed "c" characteristic of the pile material o since the pile force and compression vary during impact, the instantaneous speed (velocity) of a pile particle is generally different tram the speed (c) of the force wave ifself o for pure impact (no other forces acting) the force in the piie at a given point and time
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