Unlock document.
This document is partially blurred.
Unlock all pages and 1 million more documents.
Get Access
27
Chapter 4
4.1 a. Refer to the plot of w versus N.
LL = 29.0
25
25
4.3 a.
37.86=
−
=
−
=
14
28
log
274.38
log
1
2
21
N
N
ww
I
F
4.4 a. From the plot, LL = 26.1
28
4.5 a. From the plot, LL ≈ 37.05
4.6 Following the procedures described in Figure 4.22, the coordinates of point A
4.7 From the plot, LL ≈ 33.8
(%) (%)
w w
−
4.8 Eq. (4.5): 32.2
===
)17log()77.0(
5.30
log77.0 d
w
LL
4.10 3.19
=
i
V cm
3
;
16
=
f
V
cm
3
;
37
1
=M
g;
28
2
=M
g
30
© 2018 Cengage Learning®. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
−
−
−
−
−
=
8.136.20
6.345.47
)100)(()100(4.11
22
21
w
fi
ρ
M
VV
M
MM
SL
4.12
3
cm 27.8
)1)(72.2(
5.22 ===
ws
s
s
G
M
V
ρ
CRITICAL THINKING PROBLEMS
4.C.1 a. From Eq. (4.28):
(% of clay-size fraction, by weight)
PI
A=
The computed PI values are provided in the table.
31
© 2018 Cengage Learning®. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.
b. From Table 4.3:
Beauharnois
Detroit I
Horten
Gosport
Mexico City
Shellhaven
St. Thuribe
A = 0.52; PI = 41.08
A = 0.36; PI = 12.96
A = 0.42; PI = 16.8
A = 0.89; PI = 48.95
A = 4.5; PI = 405
A = 1.33; PI = 54.53
A = 0.33; PI = 11.88
Mineral: Illite
Mineral: Kaolinite
Mineral: Kaolinite
Mineral: Illite
Mineral: Montmorillonite
Mineral: Illite
Mineral: Kaolinite
c. Sensitivity,
undisturbed
remolded
f
t
f
S
τ
τ
−
−
=
Explanation: The shear strength of clay comes from two components – the
cohesion, which is the cementing force between particles, and the frictional
32
PLw
−
Soil % clay
(< 0.002 mm
in size)
wn
(%)
LL PL
LI
b. Soils 1 and 4: Since the LI range is greater than 1.0, the water content is
