# Geotechnical Engineering Worksheet

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Home Work 2 1. A soil has 70 percent passing the No. 4 sieve and 10 percent passing the No. 200 sieve. The coefficient of uniformity is 4 and the fines are non-plastic. Classify the soil according to the Unified Soil Classification System 2. Using the date presented for the given soil sample, determine the soil classification using the Unified Soil Classification System (USCS). Particle size distribution (percent passing) Sieve No. No. 8 (2.36mm) No. 16 (1.18mm) No. 30 (0.600 mm) No. 50 (0.300 mm) No. 100 (0.150 mm) No. 200 (0.075mm) B3 (10-11ft) 100.00 99.4 96.8 93.0 86.0 72.0 Atterberg Limits Liquid Limit 38 Plastic Limit 20 3. The following laboratory results were obtained for a soil sample. Particle size distribution (percent passing) Sieve No. No. 8 (2.36mm) No. 16 (1.18mm) No. 30 (0.600 mm) No. 50 (0.300 mm) No. 100 (0.150 mm) No. 200 (0.075mm) B1 (5-6ft) 100.00 99.3 97.9 93.1 77.2 58.6 Atterberg Limits Liquid Limit 29 Plastic Limit 19 Classify B1 (5-6ft) according to the AASHTO system. 4. The following are the results of a sieve analysis: U.S. sieve no Mass of soil retained (g) 0 18.5 53.2 90.5 81.8 92.2 58.5 26.5 4 10 20 40 60 100 200 Pan a. b. c. d. e. 4. Determine the percent finer than each sieve and plot a grain-size distribution curve Determine D10, D30, and D60 from the grain-size distribution curve Calculate the uniformity coefficient Cu Calculate the coefficient of graduation Cc Classify the soil using both the ASSHTO and Unified Soil Classification Systems. Following are the results from the liquid and plastic limit tests for a soil. Liquid limit tests Number of blows, N Moisture content (%) 36.5 34.1 27.0 16 20 28 Plastic limit test: PL =12.2 % 1 a. Draw the flow curve and obtain the liquid limit. b. What is the plasticity index of the soil ? c. Determine the liquidity index of the soil if win situ=31% 5. A minus No. 40 material had a liquidity index of 0.73, a natural water content of 44.5 %, and a plasticity index of 24.7. Classify this soil according to the USCS, providing the group symbol for it. You do not need to graph this data; use linear interpolation if you need specific values not given. 6. Refer to the following test data: % Passing # 200 sieve 60 Liquid Limit 55 Plastic Limit 30 What is the USCS Classification of this soil ? 7. Classify the following soils by the AASHTO classification system and give the group indices. 2 3 4
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Home work 2
Question 1
The unified system of soil grouping
No 4 sieve= 50%
200 sieve= 200%= 72
GW= well graded fine to gravel
Question 2
High plasticity= LL 50
Low plasticity= LL 50
PI= LL- PL = 52-20 = 32. This soil is above A-line, this soil is inorganic of high plasticity.
Question 3
200*0.075mm= 58.6 = > 35%,
LL =2g, PL = 1g
Pl=ll-pl = 2g – 1g= 10
10 is less than 40 thus it belongs to A-4...

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