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
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
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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