A constant head permeability test for a soil sample gave the following results, L=30cm, Diameter of the specimen =70cm, constant head difference =50cm, water collected in a period of 5 minutes =350xm^2. Estimate the hydraulic conductivity in cm/seconds
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A constant head permeability test for a soil sample gave the following results,
L=30cm, Diameter of the specimen =70cm, constant head difference =50cm, water collected in a period of 5 minutes =350xm^2. Estimate the hydraulic conductivity in cm/seconds
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- The results of a constant-head permeability test for a sand sample having a sectional area of 10000mm2 and a length of 200 mm are as follows: (1) Constant head difference 400mm (2) Time of collection of water = 30 seconds (3) Volume of water collected = 600 cm3. The hydraulic conductivity is: Oa. 1.0 mm/sec Ob. 1,7mm/sec c. 2.9 mm/sec O d. 0.5mm/secThe 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.A falling head hydraulic conductivity test is performed on a sample of soil. The following values are given: Length of specimen = 8 in. • Area of soil specimen = 1.6 in^2 • Area of standpipe = 0.06 in^2 • Head difference at time t=0 = 20 in %3D • Head difference at time t=180 sec = 12 in a. Find the coefficient of permeability of soil b. Compute the rate of flow of water in the soil
- A constant-head test was conducted on a sample of soil 15 cm long and 60 cm^2 in cross-sectional area. The quantity of water collected was 50 cm^3 in 20 seconds under a head difference of 24 cm. Estimate the hydraulic conductivity in cm/s with a porosity of 35% from the result of test. a.2.6 x 10^-6 b.4.3 x 10^-3 c.7.0 x 10^-6 d.3.47 x 10^-2The 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 velocityThe results of a constant-head permeability test for a fine sand sample having a diameter of 150 mm and a length of 300mm are as follows; Constant Head Difference = 500mm Time of Collection of Water = 5 min. Volume of Water Collected = 350cm³ Temperature of Water = 25°C Find the hydraulic conductivity for the soil at 20°C
- For a falling-head permeability test, the following values are given: Length of specimen = 200 mm %3D Area of soil specimen = 1000 mm^2 %3D Area of standpipe = 40 mm^2 Head difference at time t = 0 = 500 mm Head difference at timt t 180 seconds = 350 mm %D %3D Determine the hydraulic conductivity of the soil in x10 4 cm secHYDRAULIC CONDUCTIVITY PROBLEM 1: The results of a constant head permeability test for a fine sand and sample having a diameter of 150 mm and a length of 150 mm are as follows: Constant head difference = 40 cm Time of collection of water = 83 sec Weight of water collected = 392 g Find the hydraulic conductivity a. 0.094 cm/sec b. 0.01 cm/sec C. c. 0.005 cm/sec d. 0.86 cm/secThe data from a falling-head test on a silty clay are: Cross sectional area of soil = 1000 mm^2 Length of soil sample = 200 mm Area of stand pipe = 40 mm^2 Head difference at time t = 0 is 500 mm Head difference at time t = 3 min is 300 mm a) Determine the hydraulic conductivity of the soil in cm/sec. b) What is the head difference at time t = 100 sec in mm
- In a constant head permeability test, a sample of soil 12cm long and 6cm in diameter discharged 1.8 x10^-3m^3 of water in 15 minutes. The head difference in two piezometers A and B located at 1cm and 11cm, respectively, from the bottom of the sample is 2cm A.Determune the hydraulic conductivity of the soil in cm/s Choices: 0.32,0.40,0.35,0.34 B.Calculate the discharge velocity in mm/s Choices: 0.79,0.68,0.71,0.64 C. How long will it take in minutes for the test to collect 3L of water Choices: 22.29,25,26.15,27.69For a variable head permeability test, these values are given:• Length of the soil specimen 200 mm• Area of the soil specimen 1000 mm2• Area of the standpipe 40 mm2• Head difference at time t 0 is 500 mm• Head difference at time t 3 min is 300 mma. Determine the hydraulic conductivity of the soil in cm/sec.b. What was the head difference at time t 100 sec?6. The following data are for a falling-head permeability test: • Length of the soil sample = 140mm • Diameter of soil sample = 70 mm • Area of the standpipe = 19.6 mm? At time t= 0, head difference 5 500 mm At time t= 7 min, head difference 5 350 mm %3D a. Determine the hydraulic conductivity of the soil (cm/sec). b. What was the head difference at t= 5 min?
