116_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

116_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - o...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
DF6 End Bearing, q,: o General Equation: !q, = eN e + qN q + O.4B'YNyl (deep, local shear failure) where ql c q B Y N c. N Q• NT = unit end bearing on toe = cohesion, C u or c' = vertical stress at pile toe (effective stress for drained analysis) = pile width or diameter = soil unit weight under pile toe (y lor drained analysis) = bearing capacity factors . . Anglu t'llnl.lrool. h\clloo. '. I , , , , , , , , , , , , , , r ) f,i, ,j,~ ;1:: T€ff: ~/~l' ,_ 0:- " 'i~~' { ~ ~i: . . , 't; U~!:.:: . .. , . .,;, Jc 'f/;j:'~~, . . .. , ~~ '" '''' . !fi'~. J.j)'. . . ~. ~. -'. '..J ", •.1 l,. "' " 1-':· 'j' , ','\~ " ·Y,Jj,.· ., .. ',- . ., ., . '" ... . . . , p.,. . .1 .' ., . 0 "'I/o (of . ' .:. :1--, .... ] I .. . a 3Q'I,S2 " " " 4' " " 2·' 20 26 34 20 4 220 ,rm I '00 .5' '00 t ,''''' '1' ~to I~U1O lIll '" ,.is evalua.tedlrom-the :r eLzagbkshall=-BG quation critical depth limitation still applies ~to,,&<l3e q~, - Y Q EJ _'a', - fEJ e since B is relative"IYL-"Sm=a"II,;-,-_-,,---,cc- Ny is small so '" Iqr=-qN~ cr'v:Nqt • is evaluatedJro the.cbart al right· u~te.r Q[,suggesteOOfange
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o Sands criheSJon e.ss!: (drained analysis) o 6Iays::(cohesive): (undrained, total stress, short term) $ = 0 and N q = 1, so N q term is small and neglected '" jg, = cuNe I-eommonly accepted1hat N e ~ lorpile . Remember that N e = 5.14 tor shallow BC. It is , ~.' higher for piles because of ignoring N q term and difficulty of separating from friction at toe. ~~ Clays, Silts, Mixed Soils (cohesion, friction, drained, effective stress, Ion term: r./ use same analysis as for sands, i.e., ignore N c and Ny terms so Q qt = qN q = cr'v N q lor D < Dc '" q = cr', = yD for ° ~ Dc Q q = cr'v = iD c a Layered Soits: use the above analysis appropriate for bearing layer, weak layers within 8B above toe will affect bearing capacity...
View Full Document

This note was uploaded on 02/10/2012 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.

Ask a homework question - tutors are online