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lable 5.2 Unified Soll Classification System (Based on Material Passing 76-2-mm Sieve) Criteria for assigning group symbols Gravel More than 50% of coarve fraction retained on No. 4 sieve Coarse-grained soils More than 50% of retained on No. 200 sieve Sands 50% or more of coense fraction passes No. 4 Silts and clays Iiquid mit f Clean Oravels Less than 5% fines Onevels with Fines More than 12% fines Clean Sands Less than 5% fines Sands with Fines More than 12% fines Inorganic C₂4 and 1C, N3 <4 and/or C, < 1 or C₁ > PI<4 or plots below "A" line (Figure 5.3) Pl> 7 and plots on or above "A" line (Figure 5.3) C, 6 and 1C, NY <6 and/or C, <1 or C₁ > Pl<4 or plots below "A" line (Figure 5.3) Pl> 7 and plots on or above "A" line (Figure 5.3) Pl> 7 and plots on or above "A" line (Figure 5.37 PI<4 or plots below "A" line (Figure 5.37 Group symbol GW OP OM Oc SW SP SM SC CL ML

lable 5.2 Unified Soll Classification System (Based on Material Passing 76-2-mm Sieve) Criteria for assigning group symbols Gravel More than 50% of coarve fraction retained on No. 4 sieve Coarse-grained soils More than 50% of retained on No. 200 sieve Sands 50% or more of coense fraction passes No. 4 Silts and clays Iiquid mit f Clean Oravels Less than 5% fines Onevels with Fines More than 12% fines Clean Sands Less than 5% fines Sands with Fines More than 12% fines Inorganic C₂4 and 1C, N3 <4 and/or C, < 1 or C₁ > PI<4 or plots below "A" line (Figure 5.3) Pl> 7 and plots on or above "A" line (Figure 5.3) C, 6 and 1C, NY <6 and/or C, <1 or C₁ > Pl<4 or plots below "A" line (Figure 5.3) Pl> 7 and plots on or above "A" line (Figure 5.3) Pl> 7 and plots on or above "A" line (Figure 5.37 PI<4 or plots below "A" line (Figure 5.37 Group symbol GW OP OM Oc SW SP SM SC CL ML

Principles of Geotechnical Engineering (MindTap Course List)
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN:9781305970939
Author:Braja M. Das, Khaled Sobhan
Publisher:Braja M. Das, Khaled Sobhan
Chapter4: Plasticity And Structure Of Soil
Section: Chapter Questions
Problem 4.9P
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0 10 16 20 30 40 Liquid limit 50 60 70 80 90 100 0 10- CL-ML 20 Plasticity index 30 J A-line PI = 0.73(LL - 20) 40- U-line PI = 0.9(LL - 8) 70 7 Table 5.2 Unified Soil Classification System (Based on Material Passing 76.2-mm Sieve) Criteria for assigning group symbols O Gravels More than 50% of coarve fraction retained on No. 4 sieve Sands 50% or more of coerse fraction passes No. 4 sieve Coarse-grained soils More than 50% of retained on No. 200 sieve Fine-grained soils 50% or more passes No. 200 sieve Silts and clays Liquid limit less than 50 Silts and clays Liquid limit 50 or more Clean Gravels Less than 5% fines Gravels with Fines More than 12% fines Clean Sands Less than 5% fines Sands with Fines More than 12% fines Inorganic Organic Inorganic Organic C, 4 and 1 c, s 3 C<4 and/or C, < 1 or C, > 3r PI< 4 or plots below "A" line (Figure 5.3) PI> 7 and plots on or above "A" line (Figure 5.3) C = 6 and 1 c, ≤ 3 C6 and/or C, < 1 or C,> 3º Pl< 4 or plots below "A" line (Figure 5.3) PI> 7 and plots on or above "A" line (Figure 5.3) Pl> 7 and plots on or above "A" line (Figure 5.3 PI < 4 or plots below "A" line (Figure 5.3) Liquid limit-oven dried <0.75;see Figure 5.3;OL zone Liquid limit-not dried PI plots on or above "A" line (Figure 5.3) PI plots below "A" line (Figure 5.3) < 0.75;see Figure 5.3;OH zone Liquid limit-oven dried Liquid limit-not dried Primarily organic matter, dark in color, and organic odor Highly organic soils "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. Des C₁- Dio (D₂)² Dax De 'C.- "If 4 = PI ≤7 and plots in the hatched area in Figure 5.3. use dual symbol GC-GM or SC-SM. If 4 = PI = 7 and plots in the hatched area in Figure 5.3, use dual symbol CL-ML. Group symbol GW GP GM GC SW SP SM SC CL ML OL CH MH OH Pt
Transcribed Image Text:0 10 16 20 30 40 Liquid limit 50 60 70 80 90 100 0 10- CL-ML 20 Plasticity index 30 J A-line PI = 0.73(LL - 20) 40- U-line PI = 0.9(LL - 8) 70 7 Table 5.2 Unified Soil Classification System (Based on Material Passing 76.2-mm Sieve) Criteria for assigning group symbols O Gravels More than 50% of coarve fraction retained on No. 4 sieve Sands 50% or more of coerse fraction passes No. 4 sieve Coarse-grained soils More than 50% of retained on No. 200 sieve Fine-grained soils 50% or more passes No. 200 sieve Silts and clays Liquid limit less than 50 Silts and clays Liquid limit 50 or more Clean Gravels Less than 5% fines Gravels with Fines More than 12% fines Clean Sands Less than 5% fines Sands with Fines More than 12% fines Inorganic Organic Inorganic Organic C, 4 and 1 c, s 3 C<4 and/or C, < 1 or C, > 3r PI< 4 or plots below "A" line (Figure 5.3) PI> 7 and plots on or above "A" line (Figure 5.3) C = 6 and 1 c, ≤ 3 C6 and/or C, < 1 or C,> 3º Pl< 4 or plots below "A" line (Figure 5.3) PI> 7 and plots on or above "A" line (Figure 5.3) Pl> 7 and plots on or above "A" line (Figure 5.3 PI < 4 or plots below "A" line (Figure 5.3) Liquid limit-oven dried <0.75;see Figure 5.3;OL zone Liquid limit-not dried PI plots on or above "A" line (Figure 5.3) PI plots below "A" line (Figure 5.3) < 0.75;see Figure 5.3;OH zone Liquid limit-oven dried Liquid limit-not dried Primarily organic matter, dark in color, and organic odor Highly organic soils "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. Des C₁- Dio (D₂)² Dax De 'C.- "If 4 = PI ≤7 and plots in the hatched area in Figure 5.3. use dual symbol GC-GM or SC-SM. If 4 = PI = 7 and plots in the hatched area in Figure 5.3, use dual symbol CL-ML. Group symbol GW GP GM GC SW SP SM SC CL ML OL CH MH OH Pt
Situation 1: 1. 2. 3. Sieve No. #4 #8 # 10 #20 #40 #60 # 100 #200 LL PL Refer to the table below. It shows a sieve analysis of soil samples A, B, and C. Diameter (mm) 4.760 2.380 2.000 0.840 0.420 0.250 0.149 0.074 A 100 97 92 87 53 42 26 C 100 100 98 92 84 79 70 63 Characteristics of - 40 fraction 47 24 17 Soil Sample B 90 64 54 34 22 17 9 4 35 20 Refer to figure GEO 114.3 Using USCS, determine the classification of soil A. Write the symbol and the corresponding soil classification (e.g. GW - Well graded gravel) Using USCS, find the classification of soil B. Write the symbol and the corresponding soil classification. (e.g. GW - Well graded gravel) Using USCS, compute the classification of soil C. Write the symbol and the corresponding soil classification. (e.g. GW - Well graded gravel)
Transcribed Image Text:Situation 1: 1. 2. 3. Sieve No. #4 #8 # 10 #20 #40 #60 # 100 #200 LL PL Refer to the table below. It shows a sieve analysis of soil samples A, B, and C. Diameter (mm) 4.760 2.380 2.000 0.840 0.420 0.250 0.149 0.074 A 100 97 92 87 53 42 26 C 100 100 98 92 84 79 70 63 Characteristics of - 40 fraction 47 24 17 Soil Sample B 90 64 54 34 22 17 9 4 35 20 Refer to figure GEO 114.3 Using USCS, determine the classification of soil A. Write the symbol and the corresponding soil classification (e.g. GW - Well graded gravel) Using USCS, find the classification of soil B. Write the symbol and the corresponding soil classification. (e.g. GW - Well graded gravel) Using USCS, compute the classification of soil C. Write the symbol and the corresponding soil classification. (e.g. GW - Well graded gravel)
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