Analysis of the ‘Biarez–Favre’ and ‘Burland’ models for the compressibility of remoulded clays

Abstract

This study aims at comparing the prediction by the Biarez and Favre model as well as by the more recent Burland one, established for reconstituted normally consolidated clays submitted to oedometric loading. The former, proposed in the 1970s, uses the liquidity index I L , and while the latter introduces a parameter, I v, which is a normalised void index based on two characteristic void ratios (e à 100 and e à 1000 ) corresponding to the oedometric curve of s 0 v ¼ 100 kPa and s 0 v ¼ 1000 kPa. The aim of these models is to predict the compressibility parameters based on the identification of parameters represented by the Atterberg limits (w L , w P , I p ) as well as of other physical parameters such as the void ratio e or the natural water content w nat, taking into account the effective overburden pressure s 0 v . These models, which represent the intrinsic properties of clays under compression, are compared with two experimental curves, the first one representing remoulded and reconstituted clay, and the other one a deepwater clay sediment taken from the Gulf of Guinea at a depth of 700 m.

Behaviour of a sensitive marine sediment: microstructural investigation

“…Extensive studies on the index properties of the material have been performed and published by various authors (e.g. Favre & Hattab, 2008;Hattab & Favre, 2010). Identification of the GoG clay properties through the Atterberg limits represented in the (w L -I p ) diagram ( Fig.…”

Analysis of the experimental compressibility of deep water marine sediments from the Gulf of Guinea

“…12). Favre and Hattab (2008) demonstrated that the difference between the two curves concerns especially clays with high liquidity limits (above 100%), which is the case with GoG's clay.…”

Physical chemical analysis of marine sediment cementation from the Gulf of Guinea

“…The GoG_REM curve (Fig. 3), were e is the void ratio and s' v the vertical effective stress, exhibits the intrinsic compressibility phenomenon of the sediment (Burland, 1990;Favre and Hattab, 2008) characterized by the compression index C c = 0.94. The observed paths, for both intact sediments, highlight the behaviour of a non-remoulded (intact) normally consolidated sediment, with a bend towards the stress s' v = 60 kPa located above the remoulded oedometric path, suggesting the beginning of breakage of cementation between ''grains'' and particles.…”