2. The coefficient of permeability for a fine-grained soil is determined in the laboratory by use of a falling head test. Test conditions and results are as indicated below. Determine the coefficient of permeability, then indicate the probable soil classification. - Length of soil sample = 150mm - Cross-sectional area of standpipe = 200mm2 - Cross-sectional area of soil sample = 1,140mm2 - At the start of the test, the water level in the supply standpipe is 0.95m above the top of the permeameter. - %3D Draw the sketch. Reference Table for Soil Classification Soil Type k, Coefficient of Permeability (mm/sec) Clean Gravel 10 - 100 Clean Sand and Gravel mixture none Fine sand.silt 10-2 to 10-4 Sand Silt Clay 10-3 to 10-6 Glacial < 10-6

2. The coefficient of permeability for a fine-grained soil is determined in the laboratory by use of a falling head test. Test conditions and results are as indicated below. Determine the coefficient of permeability, then indicate the probable soil classification. - Length of soil sample = 150mm - Cross-sectional area of standpipe = 200mm2 - Cross-sectional area of soil sample = 1,140mm2 - At the start of the test, the water level in the supply standpipe is 0.95m above the top of the permeameter. - %3D Draw the sketch. Reference Table for Soil Classification Soil Type k, Coefficient of Permeability (mm/sec) Clean Gravel 10 - 100 Clean Sand and Gravel mixture none Fine sand.silt 10-2 to 10-4 Sand Silt Clay 10-3 to 10-6 Glacial < 10-6

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter5: Soil Compaction

Section: Chapter Questions

Problem 5.7P

See similar textbooks

Similar questions

The coefficient of permeability for a fine-grained soil is determined in a laboratory by use of a falling-head test. Test conditions and results are as indicated below. Determine the coefficient of permeability, then indicate the probable soil classification. Length of soil sample = 150 mm Cross-sectional area of sample = 1,140 mm2 Cross-sectional area of standpipe = 200 mm2 At the start of the test, the water level in the supply standpipe is 1 m above the top of the permeameter. One hour after start, the water level in the supply standpipe is 0.95 m above the top of the permeameter.
For a given soil sample, n= 0.43 and G₁ = 2.66. Calculate the dry unit weight and degree of saturation. Show complete solutions.
A constant head permeability test was performed on a 40 cm² (cross sectional area) soil sample. The length of the sample was 5 cm, and a 20 cm head difference was applied during testing. If 10 cm³ of water was collected over 60 sec, calculate the coefficient of permeability of the soil. (b) In a falling head permeability test, the head fell from 52 to 25 cm, in 3 minutes. The cross-sectional area of the soil sample is 80 cm²,and the length was 8 cm. If the area of the standpipe was 0.5 cm², compute the coefficient of permeability of the soil.
A soil specimen has a volume of 0.06 m3 and a mass of 89.5 kg. Given: w=16%, Gs = 2.64. Determinea. Void ratio b. Porosity c. Dry unit weight d. Moist unit weight e. Degree of saturation
The figure below is a constant-head permeability test device. The cross-sectional area of the sample is 120 cm2. After 10 seconds, the volume of water flowing through the soil sample is 150 cm3. What is the coefficient of permeability of the soil sample? What is the hydraulic gradient and seepage force of the seepage flow?
Determine the volume of water flowing through the sample shown in the figure per hour. There are 3 different soil layers and each is 200mm in length and diameter is 150mm. A constant head of 470mm is maintained across the soil sample. The porosity for Soil I is 0.5 and the value of k is 5*10^-3 cm/s. The porosity for Soil II is 0.55 and the value of k is 4.2*10^-2 cm/s. The porosity for Soil III is 0.35 and the value of k is 3.69*10^-4 cm/s. The hydraulic conductivities are measured in the direction of the flow.
A sample of soil obtained from a borrow pit has a wet weight of 42 lb. The total volume occupied by the sample when in the ground was 0.34 ft3. A small portion of the sample is used to determine the water content. When wet, the sample mass is 150 g; after drying, 125 g. (a) What is the water content of the sample? (b) Determine the wet and the dry unit weights of the soil in the borrow pit.
A fully saturated clay sample has a mass of 1526 grams. After oven-drying, its mass was reduced to 1053 grams. The specific gravity of soil particles is 2.7. Calculate the natural water content of the sample in percent. Select one: a. 51.26 b. 44.92 c. 20.12 d. 36.17
A cylindrical soil sample prepared for laboratory testing has a diameter of 71 mm, a height of 142 mm, and weighs 10.675 x 10-3 kN. If the degree of saturation is 93% and the specific gravity of soil solids is 2.71, determine: void ratio water content water content under fully saturated condition
A soil sample is taken from a small test hole in a soil borrow pit. The volume of the test hole is determined to be 0.028 m3. The wet mass of the soil is 56 kg and the dry mass is 49 kg. The specific gravity of soil solids is 2.72. Determine wet and dry density, wet and dry unit weight, water content, voidratio, and degree of saturation.
a. A constant head permeability test was performed on a 30 cm2 (cross sectional area) soil sample. The length of the samples was 10 cm, and a 15 cm head difference was applied during testing. If 20 cm3 of water was collected over 2 minutes, calculate the coefficient of permeability of the soil. b. In a falling head permeability test, the head fell from 62 to 35 cm in 4 minutes. The cross sectional area of the sample is 50 cm2 and the length was 9 cm. If the area of the stand pipe was 0.6 cm2 compute the coefficient of permeability of the soil.
An undisturbed soil sample was prepared for a triaxial testing. The cylindrical soil sample is 50 mm in diameter and 100 mm long. It has a mass of 360 g. After finding the mass of the entire sample, a small portion was removed and a moisture content test was performed on it. The result of the moisture content test is shown in Table 3(a). Given the specific gravity, G, is 2.70. (i) Compute the moisture content (%) of the soil sample. (ii) By using the soil phase diagram, determine the bulk density (kg/m³), dry density (kg/m³), void ratio, porosity (%) and degree of saturation (%) of the soil sample.