Geotechnical Engineering

(Jeff_L) #1
DHARM

444 GEOTECHNICAL ENGINEERING


Since γd =

G
e

G
wG
s

w
s

. ww
()
. ..
.


,

γγ

(^11)
265 981
1
+^265


F +
HG
I
KJ
= ×



  • F ×
    HG
    I
    KJ
    for Zero air-voids condition, γd =
    265 981
    1 265
    100
    ..
    .
    × ,
    F + ×
    HG
    I
    KJ
    w
    w being in %,
    and for Ten per cent air-voids condition, γd =
    265 981
    1 265
    90
    ..
    .
    × ,
    F + ×
    HG
    I
    KJ
    w
    w being in %.
    From these equations, the following values are computed:
    Dry density γd (kN/m^3 )
    Water content (% w) Zero air-voids condition Ten per cen air content
    condition (90% saturation)
    8 21.45 21.04
    10 20.55 20.10
    12 19.73 19.20
    13 19.34 18.80
    14 18.96 18.40
    16 18.26 17.66
    The moisture-dry density curve and the zero air-voids and ten per cent air-voids lines
    are shown in Fig. 12.12.
    21
    20
    19
    18
    Dry density,
    kN/m
    gd
    3
    10 12 14 16
    10% Air content line
    (90% saturation line)
    Zero air-voids line
    (saturation line)
    Compaction
    curve
    Water content, w%
    Fig. 12.12 Compaction curve and saturation lines (Ex. 12.6)

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