Problem Set 2:5. A cubical sample of San Francisco Bay mud (a soft marine silty clay) hasbeen prepared for testing in a true triaxial device. The dimensions of thesample are 76 mm by 76 mm by 76 mm. The sample has a moisturecontent (w) of 68.5% and a moist density (r) of 1.44 g/cm³. The averagespecific gravity of solids (G,) is 2.55.Determine (a) the void ratio (e) and degree of saturation (S), (b) themoist density (g) and moisture content (w) if the soil becomes saturatedat the same total volume, and (c) the density (p) of the soil if all pore fluidis dried off with no change in total volume.Provide the Phase Diagram.

Answered: Image /qna-images/answer/b4f884c2-2c22-4353-9103-a18ac7466a35.jpg

Answered: 5. A cubical sample of San Francisco…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.7P

See similar textbooks

Similar questions

PART IV: PERMEABILIT Y PROBLEM A For a constant head laboratory test on a fine sand, the following are the given values : • Length of the specimen • Di ameter of the specimen 14.0 inches 3.25 inches He ad difference 25.0 inches Water collected in 2.50 mins Void ratio A. Compute for the hydraulic conductivity of the soil in in/sec. B. Determine the discharge velocity through the soil in in/sec. c. Determine the seepage velocity in in/sec. 0.065 cubic inches 0.45
A cubical sample collected from Lobo shoreline (a soft marine silty clay) has been preparedfor testing in a true triaxial device. The dimensions of the sample are 78 mm by 78 mm by 78mm. The sample has a moisture content (w) of 68.5% and a moist density (ρ) of 1.43 g/cm3.The average specific gravity of solids (Gs) is 2.55.Determine(a) the void ratio (e),(b) the degree of saturation (S),(c) the moist density (γ),(d) moisture content (w) if the soil becomes saturated at the same total volume;(e) the density (ρ) of the soil if all pore fluid is dried off with no change in totalvolume.
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?
2. A constant head laboratory permeability test an o fines and gives the following values Length of specimen - 254 mm Diameter of specimen -63.5 mm Head difference=457 mm Water collected in 2 min -0.51 cm^3 Determine these values o. Hydraulic conductivity, k, of the soil (cm/sec) b. Discharge velocity (cm/sec) c. Seepoge velocity (cm/sec) The void ratin of the soil specimen is 0.46.
For a constant head laboratory permeability test on a fine sand, the following are given: Length of specimen = 250 mm Dia. of specimen = 62.5 mm Head difference = 450 mm Water collected in 2 min. = 484 cu.mm Determine the discharge velocity in mm/sec. 0.0789 mm/sec 0.001315 mm/sec 4.734 mm/sec 0.0438 mm/sec
Problem: For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen - 16 cm Diameter of specimen - 9.6 cm Constant head difference - 50 cm Volume of water collected in 4 min - 420 cc Void ratio of the soil specimen - 0.55 A.) Determine the hydraulic conductivity of the soil in cm/sec B.) Determine the discharge velocity in cm/sec C.) Determine seepage velocity in cm/sec Problem: For a falling head permeability test, the following are given: Length of Soil Specimen - 200mm Area of Soil Specimen - 1000mm^2 Area of Stand pipe - 40mm^2 Head Difference at time t = 0 min - 500mm Head Difference at time t = 3 min - 300mm A.) Compute hydraulic conductivity of the soil in cm/sec B.) Compute the seepage velocity if the porosity is 0.25 in cm/sec C.) What is the head difference at time t = 100 sec in mm
Problem: For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen - 16 cm Diameter of specimen - 9.6 cm Constant head difference - 50 cm Volume of water collected in 4 min - 420 cc Void ratio of the soil specimen - 0.55 A.) Determine the hydraulic conductivity of the soil in cm/sec B.) Determine the discharge velocity in cm/sec C.) Determine seepage velocity in cm/sec
Problem Set 2: 4. A sample of gray silty clay has a mass of 126 kg. Laboratory tests results give a moist density (p) of 2.05 g/cm³, a specific gravity of solids (G,) of 2.71, and a moisture content (w) of 15.7%. First determine all entries in the phase diagram. Then determine the void ratio (e), the porosity (n), the degree of saturation (S), the dry density (Pa), the dry unit weight (ya), and the moist unit weight (y). Draw the Phase diagram.
4- The values of the minimum (emin) and maximum void ratio (emax) for a sample of pure silica sand were found to be 0.42 and 0.67, respectively. The specific gravity of solids (Gs) for the sand is 2.69. a. What is the corresponding range in dry unit weights? b. What is the corresponding range in the saturated unit weights? c. If a relative density (Dr) of 78% is desired, what will be the moisture content associated with full saturation?
glass container with pervious bottom containing fine sand in loose state (void ratio 0.8) is subjected to hydrostatic pressure from underneath until quick condition occurs in the sand. If the specific gravity of sand particles -2.65, area of cross-section of sand sample 10 cm² and height of sample = 10 cm, compute the head of water required to cause quicksand condition and also the seepage force acting from below. Seepag
7. The following results were obtained from a liquid limit test on a clay using the casagrande cup device. No. of blows 10 19 27 40 Water content (%) 60 45.2 36.5 25.2 Two determinations for the plastic limit gave water contents of 20.45 % and 20.65 %. a. Determine the plastic limit. b. Determine the plasticity index. c. Determine the liquidity index if the natural water content is 27.4%.
Don't attempt wrong i will downvote.....A cylindrical soil sample, 7.3 cm in diameter and 16.8 cm in height, is tested in a constant-head permeability apparatus. A constant head of 75 cm is maintained during the test. After 1 minute of testing, a total of 945.7 gm of water was collected. The temperature was 20 oC. The void ratio of the soil was 0.43. Calculate the following: 1. The hydraulic gradient 2. The flow rate 3. The discharge velocity 4. The seepage force per unit volume 5. The coefficient of permeability

SEE MORE QUESTIONS

Recommended textbooks for you

Fundamentals of Geotechnical Engineering (MindTap…

Civil Engineering

ISBN:

9781305635180

Author:

Braja M. Das, Nagaratnam Sivakugan

Publisher:

Cengage Learning

Principles of Geotechnical Engineering (MindTap C…

Civil Engineering

ISBN:

9781305970939

Author:

Braja M. Das, Khaled Sobhan

Publisher:

Cengage Learning

Principles of Foundation Engineering (MindTap Cou…

Civil Engineering

ISBN:

9781305081550

Author:

Braja M. Das

Publisher:

Cengage Learning

Fundamentals of Geotechnical Engineering (MindTap…

Civil Engineering

ISBN:

9781305635180

Author:

Braja M. Das, Nagaratnam Sivakugan

Publisher:

Cengage Learning

Principles of Geotechnical Engineering (MindTap C…

Civil Engineering

ISBN:

9781305970939

Author:

Braja M. Das, Khaled Sobhan

Publisher:

Cengage Learning

Principles of Foundation Engineering (MindTap Cou…

Civil Engineering

ISBN:

9781305081550

Author:

Braja M. Das

Publisher:

Cengage Learning

SEE MORE TEXTBOOKS