No. 200 sieve 100 80 Soil A Soil B 60 Figure 5.9 gives the grain-size distribution of two soils. The liquid and plastic limits of minus No. 40 sieve fraction of the soil are as follows: 40 Soll A Soil B 20 Dio Liquid limit Plastic limit 30 26 22 20 1.0 0.1 0.01 0.001 Determine the group symbols and group names according to the Unified Soil Classification System. Particle diameter (mm) - log scale Figure 5.9 Particle-size distribution of two soils You can use the following charts: Table 5.2 Unified Soil Classification System (Based on Material Passing 76.2-mm Sieve) Group symbol Criteria for assigning group symbols Gravels More than 50% of coarse fraction Gravels with Fines C, 24 and IsC, s3 C,<4 and/or C, < I or C, > 3° Clean Gravels GW GP Less than 5% fines PI <4 or plots below "A" line (Figure 5.3) GM Coarse-grained soils retained on No. 4 More than 12% fines PI>7 and plots on or above "A" line (Figure 5.3) More than 50% of retained on No. 200 Sands sieve GC sieve C,2 6 and I C, s3 C,< 6 and/or C, < 1 or C, > 3° PI < 4 or plots below "A" line (Figure 5.3) More than 12% finesd PI>7 and plots on or above "A" line (Figure 5.3) Clean Sands SW Less than 5% fines 50% or more of coarse fraction passes No. 4 sieve SP Sands with Fines SM SC PI >7 and plots on or above "A" line (Figure 5.3y PI<4 or plots below "A" line (Figure 5.3y Liquid limit-oven dried Liquid limit-not dried Inorganic Silts and clays CL ML Liquid limit less than 50 Organic <0.75; see Figure 5.3;OL zone OL Fine-grained soils 50% or more passes No. 200 sieve PI plots on or above "A" line (Figure 5.3) PI plots below "A" line (Figure 5.3) CH Inorganic MH Silts and clays Liquid limit 50 Liquid limit-oven dried Liquid limit-not dried <0.75; see Figure 5.3;OH zone or more Organic OH Highly organic soils Primarily organic matter, dark in color, and organic odor Pt "Gravels with 5 to 129% fine require dual symbols: GW-GM, GW-GC, GP-GM, GP-GC. "Sands with 5 to 12% fines require dual symbols: SW-SM, SW-SC, SP-SM, SP-SC. D C = Do (D»)² C = Do x De If 4s PI s7 and plots in the hatched area in Figure 5.3, use dual symbol GC-GM or SC-SM. Congage Leaming 2014 Percent finer

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Q3
No. 200 sieve
100
80 -
D40 -
Soil A
60
Soil B
Figure 5.9 gives the grain-size distribution of two soils. The liquid and plastic limits
40
of minus No. 40 sieve fraction of the soil are as follows:
Dyo –
Soil A
Soil B
20
D10
Liquid limit
Plastic limit
30
26
22
20
1.0
0.1
0.1
0.01
0.001
Particle diameter (mm) - log scale
Determine the group symbols and group names according to the Unified Soil
Classification System.
Figure 5.9 Particle-size distribution of two soils
You can use the following charts:
Table 5.2 Unified Soil Classification System (Based on Material Passing 76.2-mm Sieve)
Group
symbol
Criteria for assigning group symbols
Gravels
More than 50%
of coarse fraction Gravels with Fines
C, 2 4 and Is C,< 3°
C,<4 and/or C, <I or C, > 3
PI < 4 or plots below “A" line (Figure 5.3)
Clean Gravels
Less than 5% fines
GW
GP
Coarse-grained soils retained on No. 4 More than 12% fines"d PI>7 and plots on or above "A" line (Figure 5.3)
GM
GC
More than 50% of
sieve
retained on No. 200
sieve
Sands
50% or more of Less than 5% fines
C, 2 6 and Is C,= 3°
C, <6 and/or C, <I or C, > 3°
SW
SP
Clean Sands
coarse fraction
Sands with Fines
PI<4 or plots below "A" line (Figure 5.3)
PI>7 and plots on or above "A" line (Figure 5.3)
SM
SC
passes No. 4
More than 12%6 fines
sieve
Inorganic
PI >7 and plots on or above "A" line (Figure 5.3)y
PI<4 or plots below "A" line (Figure 5.3)
CL
ML
Silts and clays
Liquid limit less
than 50
Liquid limit-oven dried
Organic
< 0.75;see Figure 5.3;OL zone
OL
Fine-grained soils
50% or more passes
No. 200 sieve
Liquid limit-not dried
Pl plots on or above "A" line (Figure 5.3)
PI plots below "A" line (Figure 5.3)
CH
MH
Inorganic
Silts and clays
Liquid limit 50
or more
Liquid limit-oven dried
Liquid limit-not dried
< 0.75; see Figure 5.3;OH zone
Organic
OH
Highly organic soils
Primarily organic matter, dark in color, and organic odor
Pt
"Gravels with 5 to 12% fine require dual symbols: GW-GM, GW-GC, GP-GM, GP-GC.
"Sands with 5 to 12% fines require dual symbols: SW-SM, SW-SC, SP-SM, SP-SC.
(D»0)²
D
C, =
Do
If 4 s PI s7 and plots in the hatched area in Figure 5.3, use dual symbol GC-GM or SC-SM.
C, =
Do × Do
ercent finer
Transcribed Image Text:Q3 No. 200 sieve 100 80 - D40 - Soil A 60 Soil B Figure 5.9 gives the grain-size distribution of two soils. The liquid and plastic limits 40 of minus No. 40 sieve fraction of the soil are as follows: Dyo – Soil A Soil B 20 D10 Liquid limit Plastic limit 30 26 22 20 1.0 0.1 0.1 0.01 0.001 Particle diameter (mm) - log scale Determine the group symbols and group names according to the Unified Soil Classification System. Figure 5.9 Particle-size distribution of two soils You can use the following charts: Table 5.2 Unified Soil Classification System (Based on Material Passing 76.2-mm Sieve) Group symbol Criteria for assigning group symbols Gravels More than 50% of coarse fraction Gravels with Fines C, 2 4 and Is C,< 3° C,<4 and/or C, <I or C, > 3 PI < 4 or plots below “A" line (Figure 5.3) Clean Gravels Less than 5% fines GW GP Coarse-grained soils retained on No. 4 More than 12% fines"d PI>7 and plots on or above "A" line (Figure 5.3) GM GC More than 50% of sieve retained on No. 200 sieve Sands 50% or more of Less than 5% fines C, 2 6 and Is C,= 3° C, <6 and/or C, <I or C, > 3° SW SP Clean Sands coarse fraction Sands with Fines PI<4 or plots below "A" line (Figure 5.3) PI>7 and plots on or above "A" line (Figure 5.3) SM SC passes No. 4 More than 12%6 fines sieve Inorganic PI >7 and plots on or above "A" line (Figure 5.3)y PI<4 or plots below "A" line (Figure 5.3) CL ML Silts and clays Liquid limit less than 50 Liquid limit-oven dried Organic < 0.75;see Figure 5.3;OL zone OL Fine-grained soils 50% or more passes No. 200 sieve Liquid limit-not dried Pl plots on or above "A" line (Figure 5.3) PI plots below "A" line (Figure 5.3) CH MH Inorganic Silts and clays Liquid limit 50 or more Liquid limit-oven dried Liquid limit-not dried < 0.75; see Figure 5.3;OH zone Organic OH Highly organic soils Primarily organic matter, dark in color, and organic odor Pt "Gravels with 5 to 12% fine require dual symbols: GW-GM, GW-GC, GP-GM, GP-GC. "Sands with 5 to 12% fines require dual symbols: SW-SM, SW-SC, SP-SM, SP-SC. (D»0)² D C, = Do If 4 s PI s7 and plots in the hatched area in Figure 5.3, use dual symbol GC-GM or SC-SM. C, = Do × Do ercent finer
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