Direction Impervious layer of flow Impervious layer Figure 7.31 7.6 The results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5): • Constant-head difference = 550 mm • Water collected in 7 min = • Void ratio of sand = 0.8 450 cm³ Determine: a. Hydraulic conductivity, k (cm/sec) b. Seepage velocity 1.7 In a constant-head permeability test, the length of the specimen is 200 mm and the cross sectional area is 78.5 cm2. If k = 2.1 X 10-2 cm/sec, and a rate of flow of 130 cm3/min has to be maintained during the test, what should be the head difference across the specimen? 7.8 The following data are for a falling-head permeability test:

Direction Impervious layer of flow Impervious layer Figure 7.31 7.6 The results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5): • Constant-head difference = 550 mm • Water collected in 7 min = • Void ratio of sand = 0.8 450 cm³ Determine: a. Hydraulic conductivity, k (cm/sec) b. Seepage velocity 1.7 In a constant-head permeability test, the length of the specimen is 200 mm and the cross sectional area is 78.5 cm2. If k = 2.1 X 10-2 cm/sec, and a rate of flow of 130 cm3/min has to be maintained during the test, what should be the head difference across the specimen? 7.8 The following data are for a falling-head permeability test:

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.3P

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The results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5):• Constant-head difference = 550 mm• Water collected in 7 min = 450 cm3• Void ratio of sand = 0.8Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocity
For a constant head permeability test in a sand, the following values are given:• L 350 mm• A 125 cm2• h 420 mm• Water collected in 3 min 580 cm3• Void ratio of sand 0.61Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocity
The results of a constant-head permeability test for a fine sand sample having a diameter of 150 mm and a length of 300 mm are as follows • Constant-head difference = 500 mm • Water collected in 5 min = 350 cm3 • Void ratio of sand = 0.61 Determine: a. Hydraulic conductivity, k (cm/sec) b. Seepage velocity
The results of a constant-head permeability test for a fine sand sample having a diameter of 150 mm and a length of 300 mm are as follows: constant head difference = 500 mm, water collected in 5 min = 350 cm3, void ratio of sand = 0.61. Determine the hydraulic conductivity.
From the constant head permeability test arrangement shown, the following values are given: Void ratio of specimen = 0.46 Length of Soil Sample = 450mm Constant head difference = 700mm Water collected in a period of 3 min = 0.000354 m3 Cross-sectional Area of Soil Sample = 0.00226 m2 Determine the coefficient permeability in m/hour (Ans: 2.102 m/hr) Compute the discharge of velocity in m/min. (Ans: 0.052 m/min) Compute the seepage velocity in m/min. (Ans: 0.165 m/min)
In a sample of sand, water seeps at a volume of 158 cm3 in 7.89 minutes. If the seepage area and thickness of the specimen are 69 cm2 and 0.628 m, respectively, what is the permeability coefficient? The water has a head of 34 cm.
A fine-grained (silty-clay) soil is required for the core of a rockfill dam. The permeability tests are performed on two types of soil. The diameter (D) of the specimen was 8 cm, length (L) between the measuring points was 15 cm. the following table shows the recorded data during the test for both the soils. Soil A B Head difference, h (cm) 12 15 Volume of water, V (cm3) 10 8 Time, t (sec) 300 350 Compute the hydraulic conductivity (k) by applying Darcy’s Law and select the best soil. Give reasons for the answer.
13 For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen: 19 cm. Diameter of specimen: 99 mm. Constant head difference: 51 cm. Volume of water collected in 4.86 min.: 427 cc Void ratio of the soil specimen: 0.51 Determine the seepage velocity in m/min. Round off to four decimal places.
2. Situation 2 - For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen = 16 cm Diameter of specimen = 96 mm 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 m/min. Round off to four decimal places. b. Determine the discharge velocity in m/min. Round off to four decimal places. c. Determine the seepage velocity in m/min. Round off to four decimal places.
During a constant head permeability test on a sand sample, 260 x 10^3 mm^3 of water were collected in 2 minutes. If the sample had a length of 100 mm, a diameter of 40 mm and a maintained head of 200 mm. What is the coefficient of permeability in mm/s?
Question 40 The results of a constant head permeability test for a fine sand are as follows: Diameter of the sample = 25 cm Length of sample = 80 cm Constant head difference = 77 cm Time of collection = 388 secs Weight of water collected = 340 grams Find the seepage velocity in cm/min. if the void ratio is 0.49. Round off to four decimal places.
Situation 2 - For a constant laboratory permeability test on a fine sand, the following data are given:Length of specimen = 16 cmDiameter of specimen = 96 mmConstant Head Difference = 50 cmVolume of water collected in 4 min = 420 ccVoid ratio of the soil specimen = 0.55Determine the seepage velocity in m/min. Round off to four decimal places.