: The following data were recorded in a constant head permeability test. Internal diameter of permeameter = 7.5 cm Head lost over a sample length of 18 cm = 24.7 cm Quantity of water collected in 60 s = 626 ml Porosity of the soil sample was 44% Calculate the coefficient of permeability of the soil. Also determine the discharge velocity and the seepage velocity during the test. If the test was carried out at a temperature of 25°C, estimate the permeability of the soil for a porosity of 39% and at 20°C.

: The following data were recorded in a constant head permeability test. Internal diameter of permeameter = 7.5 cm Head lost over a sample length of 18 cm = 24.7 cm Quantity of water collected in 60 s = 626 ml Porosity of the soil sample was 44% Calculate the coefficient of permeability of the soil. Also determine the discharge velocity and the seepage velocity during the test. If the test was carried out at a temperature of 25°C, estimate the permeability of the soil for a porosity of 39% and at 20°C.

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

(a) The following data were recorded in a constant Head Permeability Test: Internal diameter of permeameter = 7.5 cm Head loss over a sample length of 18 cm = 24.7 cm Quantity of water collected in 60 seconds = 626 ml Porosity of the soil sample = 44% Calculate the coefficient of permeability of the soil. Also, determine the discharge velocity and the seepage velocity during the test.
From the constant head permeability test, the following values are given: Void ratio of specimen 0.46 Length of soil sample 450 mm Constant head difference 700 mm Water collected in a period of 180 seconds Cross-sectional area of soil sample 3.54 x 10-4 m³ 2.26 x 10-3 m² a.) Determine the coefficient of permeability in m/hour. b.) Compute the discharge velocity in mm/s. c.) Compute the seepage velocity in mm/s. d.) If the test was done at 24°C, what is its corrected coefficient of permeability?
3. Table 2 shows the results of the standard proctor test Water content (%) Weight (kg) 14 Table 2. Proctor Test Results 1,45 1,71 1,87 1,88 16,5 18,5 20 21 22,5 If this test uses a sample print with a size of 943 cm^3, answer these question b. Determine the range of moisture content for 90% compaction in the field. 1,76 1,67
The data from a falling head test is shown Diameter of the standpipe = 3cm Initial head = 91.77 cm duration of the test = 18 mins length of the soil sample = 32.98 cm diameter of the permeameter = 44 cm If the soil permeability id 0.005cm/min, determine the final head (in cm) of the permeability test.
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?
In a constant head permeability test in the laboratory as shown in Figure Q2(e), the data is recorded in Table Q2(b). The void ratio of the soil specimen is 0.46. Determine; (i) Hydraulic conductivity, k, of the soil in cm/sec. (ii) Discharge velocity in cm/sec.
A constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%, calculate the average velocity and the seepage velocity. Estimate the’ hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test.
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 seepage velocity in m/min. Round off to four decimal places. b. determine the discharge velocity in m/min. Round off to four decimal places.
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.
Problem 3 --- A falling head permeability test is conducted in the laboratory. The diameter of the standpipe was determined at 10mm. The initial head before the test was conducted was 92 cm and its final head was 85 cm. The duration of the test was 12 min. The length of the soil sample was determined at 50 cm and the permeameter diameter was 40 cm. Determine a) coefficient of permeabilty in cm/min, b) hydraulic gradient, c) rate of flow of water in soil, d) seepage velocity if the porosity is 0.25
3. A falling-head permeability test was run on a soil sample 9.6 cm in diameter and 10 cm long. The head at the start of the test was 90 cm. The coefficient of permeability of the soil was found to be 5 x 10-6 cm/s. The diameter the stand pipe was 1 cm. a) Determine the flow at the start of the test (cm³/hr) b) Determine how much head was lost during the first 30 minutes c) Determine the flow after 30 minutes (cm³/hr) 1 cm Ø Standpipe h 9.6 cm Ø Soil L = 10 cm Useful Formulas: -h1 As dh t = aL In k = A(t2 – t1)
In a permeability test conducted on a soil with e = 0.50, the discharge velocity was found to be 2.4 x 10-¹ cm/s. The seepage velocity is: