Compressibility and Swelling of an Overconsolidated Highly Plastic Paleogene Clay

Abstract

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Stress dependency and unloading-induced swelling behaviour of a high plasticity overconsolidated clay of Paleogene origin

“…Rocchi et al [14] did not find a constant Cs for the folded Røsnaes Clay. Either the unloading was carried out to UI up to 2, in which case for the first unloading, Cs increased from 0.01 to 0.03, and in the consecutive unloadings it increased from 0.03 to 0.07, without a clear trend of reaching a plateau.…”

“…The reason for the lack of a plateau (e.g. in Rocchi et al [14] tests on folded Røsnaes Clay) can be explained by the low UI. Gasparre and Coop's [15] data for London Clay, shows a trend of overall increased steepness of the unloading branches with increased σ'v,u.…”

“…The explanation given by Krogsbøll et al [13] for the increase in Cs,y was that destructuration of the sample caused by repeated unloading and reloading occurred. Rocchi et al [14] conducted a series of IL tests on both folded and intact Røsnaes Clay from the Fehmarn alignment. For the intact Røsnaes Clay unloading was carried out to UI>100, in which case Cs first reached a peak at 0.17 and 0.16 for deionised and saline water respectively, both at UI=3.5.…”

Influence of structure on the compression behaviour of two very stiff fissured high plasticity Eocene clays

“…It is generally expected to see a significant increase in the creep rates around yield [16]. In the test on intact specimens an increase above a rate of 0.5 %/log time is taken to indicate yield.…”

“…Standard interpretation methods to assess the yield pressure are based solely on the observed compression or creep behaviour of the intact soil e.g. [20] [21] [16]. Typically, no consideration is made towards the limiting behaviour, which is determined by the intrinsic properties of the soil.…”