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TABLE
1.1
UnifiedSoilClassificationSystem
Division
Description
Group
Symbol
Identification
Laboratory
ClassificationCriteria
More
than
50%
soil
retained
inUS20
0siev
e(0.075
mm)
More
than
50%
retained
inUSNo.4
(4.75mm)
Clean
gravels
GW
Wellgraded
gravels
Cu>
4,1<Cc<3
GP
Poorlygraded
gravels
NotmeetingGW
criteria
Gravel
withfines
GM
Silty
gravel
Falls
below
Alinein
theplasticitych
art,orPIless
than
4
GC
Clayey
gravel
Falls
aboveA
linein
theplasticitych
art,orPIgreater
than
7
More
than
50%
passing
USNo.4
(4.75mm)
Clean
sand
SW
Wellgraded
sand
Cu>
4,1<
Cc<3
SP
Poorlygraded
sand
NotmeetingSW
criteria
San
dwithfines
SM
Silty
sand
Falls
below
Alinein
theplasticitych
art,orPIless
than
4
SC
Clayey
sand
Falls
aboveA
linein
theplasticitych
art,orPIgreater
than
7
More
than
50%
soil
passing
US20
0siev
e(0.075
mm)
Finegrained
soils
(LL<50
)ML
Inorgan
icsilts
withlow
plasticity
CL
Inorgan
icclay
swithlow
plasticity
OL
Organ
icclay
s/silts
withlow
plasticity
Finegrained
soils
(LL>
50)
MH
Inorgan
icsilts
withhigh
plasticity
CH
Inorgan
icclay
swithhigh
plasticity
OH
Organ
icclay
s/silts
withlow
plasticity
Highly
organ
icsoils
Pt
0010203040506070 Plasticity index
2040
6080
100
Liq
uid
lim
it
U-
Line
A-li
ne
CH
or OH
CL
or OL
ML
or OL
MH
or OH
CL
- M
L
Use
theCasagrandePlasticitych
art
shownabove
Concepts and Techniques Used in Foundation Engineering 7
Recommended