Models by Jean Biarez for the Behavior of Clean Sands and Remolded Clays at Large Strains - Multiscale Geomechanics: From Soil to Engineering Projects - page 120

of the “glue-less” clays. The granular materials with d 60 /d 10 > 10 are in the plane
( e - log σ' v ) between w L = 20% and w L = 40%.

In Figure 5.7, the three straight lines in bold indicate clean sands: the line of Lee
and Seed [LEE 67], the line of Mokham [MOK 83] and the line of Flavigny and
Bousquet 1986 [FLA 93]. The dotted line is that of the model of sands with
d 60 /d 10 = 10 [BIA 94].

e WL = 70

2.00

1.80

clays

1.60

0.53

1.40

1.20

WL = 40

1.00

sands

0.25

d60/d10
1 à 2

0.18

0.80

Agrégats
routiers

0.22

0.60

0.15

0.40

WL = 20

0.065

0.13

d60/d10 = 10

0.20

0.01 0.10 1.00 10.00

p'(MPa)

Figure 5.7. Abacus, for sands and clays,
critical void index lines in (e-logp')

5.4. Normally and overconsolidated isotropic loading

5.4.1. Analogy between sands and clays

Experiments have shown that, for sands, a normally consolidated behavior can
be had for very large void ratios and for small medium stresses before the grains are
crushed (see Figure 5.8, the paths with a pronounced slope before 2 kPa). It is very
difficult to obtain a sufficiently large void ratio to observe this NC behavior of sands
and granular materials, but with slight moistening, it becomes possible.