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112_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

112_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - DF2...

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DF2 Why Use a Deep Foundation? o rarn;mit struc,tULa11oad:thfOugh'WellK upper- ayers a a aeeper "ljea'ihll'~stratu o JransmiUoads:thfOugh water (oriages, aocKs, w~arves, offSfieri3'stractures) a Resist uplill, overturn, or lateral loads (bridge piers, towers, signs, basements under GWT) o Control settlement or heave under spread footings or mats a Supporl and isolate machines (presses, lathes, mills, turbines) and heavy loads (vaulls) o Allow for future excavation, potential scour under bridges, or liquefaction under structures o Support retaining walls on soft ground Why Not Use a Pile Foundation? a 'M0fEL~Rensive than'spread hotings o Mobilize special eqoipmer:lt (hammers, cranes, drills rigs, compressors, etc.) o Risk ground movements next to existing structures o Sigr.lifiGanrgte;,umJ vibrations during c.oDstruction Parts of a Pile, Loads: Depth of Penetration, D Head, top, butt 1 i ~ Shaft Resistance, Q, Pile Weight, W Pile Width or Diameter, B Toe Resistance, Q T Toe, tip, base, end, point, bottom PREFABRICATED PILES:
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  • Fall '08
  • Staff
  • Auger, pile foundation, thfOugh'WellK upper- ayers, Mobilize special eqoipmer, poor corrosion resistance, reasonable corrosion resislance

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