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157_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

157_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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DF38 Shaft Capacity is sum of shaft and toe resistance: lp.=(O,+Q,-W)=[(f, A,)+(q, A,)-W~ where: = ullimate (axial) shaft capacity = shaft resistance along pile "skin" due to side shear = toe resistance due to end bearing = shaft weight (buoyant weight if soil saturated) = unit side shear on shaft = surtace area of shaft (circular = .8D) = unit end bearing on toe = surtace area of toe (circular = .8.'/4) o -capacity-can be-greatty aflected by construction methods andJevel of inspection o significant-contractor expertise, experienced personnel, and special construcll.Qn _e.QuiplTlent are required to properly construct a drilled shaft o .Qround loss or shaft collaRse can o,ccur due to poor construction - may destroy capacity of foundation being constructed and damage surrounding foundations o _try-to limit time
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Unformatted text preview: o _try-to limit time of open excavation (preterably < 36 hours esp. in soil) and stress loss • D,yoMethod-ot ·€onstruction: no ground water present, non-caving (cohesive) soil o rill a hole o place rebar o-tremie"in concrete o limit tr~fa' at concrete to~prevent segregation---Cobai~---=-_-_ soiL:. .:--=-_ 00 0--Trcmic-------------.,,-------:....-_-_-:. ..-:. ·'k--_-_-_-_-_ __=_ =-:---.): :~--:------.-------("I Orilililafl 10 rtqllircd dcptlL (It) l'laoc eoncn:l. lllrou~ lrem;' (alld IlK lim;led free rail). .. '-----------'.~ """""'.,., .•-----... " .--.. : .. _---.. ~ =--~~ -==~ :. =-f~~-== :-_----------=-~~~ :...-------. ....: (tl Pull-oUI Ire",i.:oDd SCi rebar cog. 10 \i.plll required. (d) Colllpleled shaft....
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