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199_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

199_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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SL25 DH H R i (= ~) c', ~', y, Slope i (=~). r =-"- " G, Y Cousins' Charts o l;;on-gotertl1 slope stability analysis ~g c' and ~' by Cousins 1978 o d3ased on :J:aylormethod: o _ omog-e ous soil o uSEts-eircular failure sUfface ana analyzes failure mass a.'i:i!:Whole o assumes a sinusoidal distribution for effective stress, cr', normal to failure surface o solution includes location of critical slip circle (X and Y measured from toe) o 'neludes pore pressure effects, f u = Pore Water Pressure = u = '1w h Total Overburden Pressure cry E"f!:. o f'aylor: method is based on total stress and requires iteration for FS o BishQR and Morgenstero...char:ts/tables give similar; answers, but no inf.o.rmati.on about ..\o.eatiQ"'=--o cr:itical circle and have smaller: range of Slopes. o Spencer charts (see Das) give similar answers, but require iteration for FS. e q:o:eliminate-itemtiol1::for:;F-S Gousins defines-a new ~aram ter, ~, .. ich is e mtiG of::the. Cleve opea friotion comp<menUo t e developed stabilit numbe: tan~ (tan~'/FS J I l." = --' = which for FS = FS, = FS, reduces to N" (c'/yH)/FS, . e for convenience Cousins defines his stability number as the inverse of the Taylor
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