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...
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- Fall '08
- local shear failure, pile toe, diameter bearing capacity, Nq term