# Handout11 - W 1 W 2 = FS3 u~ W1 W2 =(FS1.1Fs U1 A W1 W 2...

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,: . '\ Geotechnical Engineering PISTON·SPRING MODEL OF I-D CONSOLIDATION IN SOIL (1) Initial Condition open (2) Add Vertical Load e sealed W2 W1 (3) Allow Pore Water Drainage settlement open e Representation: W = weight of overburden (total vertical stress) Fs = load carried by the spring or soil skeleton (effective vertical stress) u = pore water pressure From vertical equilibrium: No drainage when add W 2 - no change in length of spring - no change in Fs, so FS1 = FS2 W1 + W 2 = FS1 + U2 A W1 + W2 = (W1 - u1A) + u2A W2 = A (U2 - U1) Open cap and allow water to drain After reach equilibrium:

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Unformatted text preview: W 1 + W 2 = FS3 + u~ W1 + W2 = (FS1 + .1Fs) + U1 A W1 + W 2 = (W1 - U1A + .1Fs) + U1 A After complete drainage: .1O"y = added pressure .6 Ll ::: 0 . ---~-==--:=-:----.:. ....--s-f.(~.s.s LiT' . . I·· .0" o o r----'----+----------------.:JII-. flfYI'f!,. ."."." ......... ......... ......... xxx ."."." 000 11100 -('I \ f",:-i /l.5 Ja.I'\Ja. .., e.Q v S aflf(ic.Q.~/')1I\ 0 f jo. .. cJ. ~ ________ ~ ________________________________ ~ ti~~ u. ~ ________ ~ _______________ ~ ____________--~~-~im~ .0 o o ,-_-'--__+--______________-7'-. f/Ple,...
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Handout11 - W 1 W 2 = FS3 u~ W1 W2 =(FS1.1Fs U1 A W1 W 2...

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