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CEE 120 Soil Classification solution

CEE 120 Soil Classification solution - cumulative(grams of...

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Soil Classification problem: Classify the following three soils according to USCS system. Sieve # Weight of soil retained (grams) Soil A Soil B Soil C 4 0 0 51 10 27 103 121 20 42 118 118 40 48 156 125 60 61 148 152 100 77 126 186 200 101 170 142 pan 638 178 53 LL 46 40 60 PL 20 20 41
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Soil A: Sieve #200 = 64% which is greater than 50% cohesive soil Casagrande’s chart, using LL= 46 and PI=26 CL Sieve # Sieve Size (mm) Weight of soil retained (grams) W of soil ret. cumulative (grams) % of soil ret. Cumulative % passing 4 4.75 0 0 0.0 100.0 10 2 27 27 2.7 97.3 20 0.85 42 69 6.9 93.1 40 0.425 48 117 11.8 88.2 60 0.25 61 178 17.9 82.1 100 0.15 77 255 25.7 74.3 200 0.075 101 356 35.8 64.2 pan - 638 994 100.0 -
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Soil B: Sieve #200 = 17.8% which is less than 50% cohesionless soil Sieve #4 = 100% which is greater than 50% Sand Sieve #200 = 17.8% which is less than 12% Casagrande’s chart, using LL= 40 and PI=20, Clay SC Sieve # Sieve Size (mm) Weight of soil retained (grams) W of soil ret.
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Unformatted text preview: cumulative (grams) % of soil ret. Cumulative % passing 4 4.75 0 0 0.0 100.0 10 2 103 103 10.3 89.7 20 0.85 118 221 22.1 77.9 40 0.425 156 377 37.7 62.3 60 0.25 148 525 52.6 47.4 100 0.15 126 651 65.2 34.8 200 0.075 170 821 82.2 17.8 pan - 178 999 100.0 - Soil C: Sieve # Sieve Size (mm) Weight of soil retained (grams) W of soil ret. cumulative (grams) % of soil ret. Cumulative % passing 4 4.75 51 51 5.4 94.6 10 2 121 172 18.1 81.9 20 0.85 118 290 30.6 69.4 40 0.425 125 415 43.8 56.2 60 0.25 152 567 59.8 40.2 100 0.15 186 753 79.4 20.6 200 0.075 142 895 94.4 5.6 pan - 53 948 100.0 - 10 20 30 40 50 60 70 80 90 100 0.04 0.4 4 % passing Grain size (mm) Sieve #200 = 5.6% which is less than 50% cohesionless soil Sieve #4 = 94.6% which is greater than 50% Sand Sieve #200 = 5.6% which is between 5% and 12% Dual symbol 1- LL= 60 and PI=19, Silt 2- from Grain size distribution curve: D 10 0.095 D 30 0.19 Cu 5.3 D 60 0.5 Cc 0.8 Poorly graded From 1 and 2: SP-SM...
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