A Standard Proctor test was performed on a clayey gravel soil; the test results are shown below. Find the degree of saturation at the optimum condition; assume that G; = 3.60. Test 1 2 3 4 5 6. 7 w% 3.00 4.45 5.85 6.95 8.05 9.46 9.90 1.94 2.01 2.06 2.09 2.08 2.06 2.05 ya kN/m? 19.4 20.1 20.6 20.9 20.8 20.6 20.5 Use Yw = 10 kN/m° for simplicity.

A Standard Proctor test was performed on a clayey gravel soil; the test results are shown below. Find the degree of saturation at the optimum condition; assume that G; = 3.60. Test 1 2 3 4 5 6. 7 w% 3.00 4.45 5.85 6.95 8.05 9.46 9.90 1.94 2.01 2.06 2.09 2.08 2.06 2.05 ya kN/m? 19.4 20.1 20.6 20.9 20.8 20.6 20.5 Use Yw = 10 kN/m° for simplicity.

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 4.8P

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The table below shows the results from the specific gravity (S.G.) test performed in a soil laboratory including twenty samples of sand. Determine the Coefficient of Quartile Variation. * Number of Specific Gravity Samples 2.30-2.39 1 2.40-2.49 2 2.50-2.59 3 2.60-2.69 6 2.70-2.79 7 2.80-2.89 1 O 0.087 O 0.011 O 0.065 O 0.033 0.024
1. During Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil. Liquid limit tests: Number of Moisture blows, N content (%) 14 38.4 16 36.5 20 33.1 28 270 Plastic limit tests: Students conducted two trials and found that PL = 172% for the first trial and PL = 17.8% for the second trial. a. Draw the flow curve and obtain the liquid limit. b. What is the plasticity index of the soil? Use an average value of PL from the two plastic limit trails.
FUNDAMENTALS OF GEOTECHNICAL ANALYSIS A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. Provide step by step solution. a) Compute the permeability based on these test conditions and results. b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values?
A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. Provide step by step solution. a) Compute the permeability based on these test conditions and results. b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values, provide step by step solution solving h1 and h2 values.
A falling head permeability test is conducted on silty soil. The sample diameter is 10.0 cm and its length or thickness is 6 cm. The diameter of the standpipe is 6.0 mm. The head at the start of the test is 58 cm. The test lasts 9 min and the head falls to 38 cm. Find the coefficient of permeability of this soil. The answer must be in 6 decimal places. Use units cm/sec. Provide step by step solution.
A falling head permeability test is conducted on silty soil. The sample diameter is 10.0 cm and its length or thickness is 6 cm. The diameter of the standpipe is 6.0 mm. The head at the start of the test is 58 cm. The test lasts 9 min and the head falls to 38 cm. Find the coefficient of permeability of this soil. The answer must be in 6 decimal places. Use units cm/sec.
Calculate the CEC (m.e./100g soil) using the following given miliequivalent weights obtained from a 25g soil sample (a. Ca++= 2.23 m.e; b. Mg++=1.32 m.e.; c. Na+= 1.98 m.e.; d. K+= 1.87 m.e.; e. H+= 1.27 m.e.; f. Al+++= 0.11 m.e.; g. NH4+= 2.3 m.e.; h. NO3-= 1.5 m.e.
Problem 1: During Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil. Liquid limit tests: Number of Moisture blows, N content (%) 14 38.4 16 36.5 20 33.1 28 27.0 Plastic limit tests: Students conducted two trials and found that PL= 17.2% for the 1st trial and PL = 17.8% for the second trial. Draw the flow curve and obtain the liquid limit. What is the plasticity index of the soil? (Hint: Use an average value of PL) Determine the flow index. Determine the liquidity index of the soil if the in-situ moisture content is 21%, and comment on the probable engineering behavior of this soil.
In falling head permeability test the initial head was 350 mm and the final head was 50 mm. The cross-sectional area of the burette was 200 mm2. The sample was 50 mm in diameter and 100 mm long. If the test took 8 hours and 45 minutes, what was the coefficient of permeability of the soil in m/s? a.7.15 x 10-7 m/s b.6.29 x 10-7 m/s c.7.89 x 10-7 m/s d.8.78 x 10-7 m/s e.5.69 x 10-7 m/s
Afalling-head permeability test is performed on a fine-grained soil. The soil sample has a length of 120 mm and a cross-sectional area of 600 mm2. The water in the standpipe flowing into the soil is 0.60 m above the top of the sample at the start of the test. It falls 50 mm in 30 minutes. The standpipe has a cross-sectional area of 200 mm2. (a) Make a sketch of the described conditions. (b) What is the coefficient of permeability in millimeters per second? (c) What is the coefficient of permeability in feet per minute? (d) On the basis of the calculated value for khyd, what is the probable soil type?
Problem 1: The table below present the results of a standard proctor test of a borrow pit soil. Mass of wet soil +Mould in (kg) 3.69 3.75 3.82 3.92 3.98 3.93 Water content (%) 6.2 11.5 12.4 13.3 8 9.8 The volume and the mass of the mould was 1000cm and 2 kg, respectively. The specific gravity of the soil is 2.72, determine the following : a) Plot the compaction curve of this soil. b) Optimum water content c) Maximum dry density. d) Plot the zero air void line. e) Determine the degree of saturation at the maximum dry density.
Determine the coefficient of permeability of the soil. For a falling- head permeability test, the following are given: re Length of the specimen = 115.5 mm Diameter of soil specimen =104.7 mm Diameter of the stand pipe = 15 mm Head difference at time t=0 is 1360 mr Head difference at timet=78600 sec is 820 mm