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Unformatted text preview: SL31 Rapid Drawdown o Short-term, effective stress, stability analysis using c' and I' by Morgenstern, 1963 (using a cornputer!) o Useful for dams and dikes when the reservoir level is reduced o ,Conditi0n just after drawdown is oJten more critic-al than submerged o,r. nonsu bTTfE:rrl;fetl--eo ntt itic ns H L Drawdown Water Level Original Water Level o Immediately after drawdown the soil is slill saturated (and heavy), seepage forces begin to develop, and effective stresses are still low c', $', y,,, , Slope i (or H:V) o Based on sirnplified method or-slices: o bomogenous s<li!, fully submergea initially a embankment 00 rigid, jmnenneable base ,:~~:"':::::':;::';:':":::'::, Equipotential "'~-r-z.~';;~;'~;:~~';J~';~:;~'?;'~;:tJ;~~;;t' '~N~~Line (dashed) o circular failure surface (;,~;:~;;;;t:;;;i;;;:~';;*;:;)(~;, II I d b i'1/VN,'N~I"r.-N'I'Ni'~'~IN'" Flow Line a seepage para e to ngl ase, h~v"'~",,,~wN"Y'N"~N,v'N';'~'~w~ ~ (solid) equipotential lines vertical, ,~~~::'::::~'~...
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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.
- Fall '08