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212_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

212_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - iii...

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SL38 o Cuts in Saturated Clay: look at stresses developed on a failure circle at point P H :5 () Depth of Excavation 'td, shear strength mobilized on critical surface through point P Time " i" ~ ~ ! __ fiG ... < 0, fiG"" - 0 - L\cr y - flU ,.j L\u < 0 (-) 0.. ~:-~ ---i'- .L_n""'n'tto that LJu unkown : W Undrained I ""l~\~"& (short time) : p,,~, /' cJ' AH' ;(\ •• J \J \". H'·(.'jl'- .J", . ~l-J'" I-' U = 'Ywh Time .c - g' f------J. i" iii ~ '" '" .c
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Unformatted text preview: iii ~ '" '" .c (J) cr't ~ 0'0 + L\cr < a'o , 't decreases as a t y decreases I , , Time ""~ '" Critical Time t, (EPWP), \ jj has minimum FS = (t / 'Cd) o \'--c--------------.J ~-------------\~;:l_ _ LL ~ "C".,;. I"""~ ~ Time o..... J J..u. L '- --'-(I,".) ,.".,) tl=endof excavation 12 = end of pore water pressure dissipation...
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