Unformatted text preview: a The ratio of secondary to primary consolidation increases as () ({j.) the ratio of stress increment to initial stress decreases: PPc S i as a~ov J. i.e. watch out for small stress increases in thick clay layers. nd of olidation Secondary Compression Index (fit "straight" line after epl C. = ·M /lIlog t = (13,13,) flog (t,/ t,) = typically 34% of C c , , , ep= void ratio at e······rlie . ...Ps l" , , primary cons , , , , , , ep Void Ratio, 13 (from dial readings) log time, t tp t, o As before: {j.H = (j.e(. ...'::I. ... ) = Ps 1 + eo and = ( C.H ) 10 (.!r.) Ps 1 + 13 g t o p where: tF = time at which magnitude of secondary compression required tp = time corresponding to end of primary consolidation o Note: C'.= [CaI(l +epl] found by Mesri to have correlation with water content, can replace CJ(l +130) with C'. in above equation for ps (see Das Fig. 8.19)...
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 Fall '08
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 secondary compression, Pi p

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