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- A sand sample of 35m cm^2 cross sectional area and 20cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 ml in 6min. The dry weight of sand used for the test was 1120 g, and Gs= 2.68 A. Determine the hydraulic conductivity in cm/sec. B.Determine the discharge velocity in cm/sec. C. Determine the seepage velocity in cm/sec.A sand sample of 35 sq. cm cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 cm, the discharge was 120 ml in 6 min. The dry weight of sand used for the test was 1120 g, and Gs = 2.68 1. Determine the hydraulic conductivity in cm/sec. 2. Determine the discharge velocity in cm/sec 3. Determine the seepage velocity in cm/secA falling head permeability test was run on a soil sample 9.6cm in diameter and 10cm long. The head at the start of the test was 90cm. The coefficient of permeability of the soil was found to be 5(10)-- cm/s. The diameter of the stand pipe was 1cm. a) Determine the flow at the start of the test in cm³/ hr. b) How much head was lost during the first 30min? c) Determine the flow after 30 minutes in cm³/hr.
- The permeameter in a perrneability test setup involves a soil sample 200 mm diameter and a length of 30 mm. The height of water is kept constant at 400 mm. In a duration of 4 min, water was collected in the graduated flask having a volume of 420 cu. cm. Determine the following. Flow Rate Hydraulic gradient Hydraulic conductivityIn a constant head permeameter test, the length of the specimen is 200 mm and the cross-sectionalarea is 78.5 cm2. If k = 2.1 x 10-2cm/sec, and a rate of flow of 130 cm3/min must be maintainedduring the test, what should be the head difference across the specimen?P 4: A sand sample of 35cm2 cross sectional area and 20cm long was tested in a constant head permeameter. Under a head of 60cm, the discharge was 120ml in 6min. The dry weight of sand used for the test was 1120g, and G3=2.68. Determine (a) the hydraulic conductivity in cm/s, (b) the discharge velocity, and (c) the seepage velocity. Answers: a) 3.174 x 103 cm/s, b) 9.52 x 10³ cm/s, c) 2.36 x 10-² cm/s
- In a falling head permeameter, the sample used is 25 cm long having a cross-sectional area of 24 cm2. The cross-sectional area of the standpipe is 2 cm2. The sample of soil is made of three layers perpendicular to the direction of the flow. The thickness of the top layer is 8 cm and has a value of k1 = 4 x 10-4 cm/sec, the second layer of thickness 10 cm has k2 = 6 x 10-4 cm/sec, and the bottom layer of thickness 7 cm has k3 = 8 x 10-4 cm/sec. Calculate the time required for a drop of head from 25 to 12 cm. ( in minutes).Problem G: For Problem 27 to 28. In a constant head permeability test the following are given L= 250 mm and A=105 cm?. If the value of k = 0.014 cm/secand flow rate of 120 cm3/min which is to be maintained. 27) What is the head difference, h in the specimen? b) 34.341 cm 28) Determine the discharge velocity in cm/sec? b) 0.109 a)34.136 cm c) 33.901 cm d) 34.014 cm a) 0.0189 c) 1.019X102 d) 0.019In a constant head permeability test, the length of the specimen is 150 mm and the cross sectional area is 1367 mm2. If k =0.062 cm/sec and a rate of flow 160cm3/min has to be maintained during the test, what should be the head differ
- Problem Set 2: 5. A cubical sample of San Francisco Bay mud (a soft marine silty clay) has been prepared for testing in a true triaxial device. The dimensions of the sample are 76 mm by 76 mm by 76 mm. The sample has a moisture content (w) of 68.5% and a moist density (r) of 1.44 g/cm³. The average specific gravity of solids (G,) is 2.55. Determine (a) the void ratio (e) and degree of saturation (S), (b) the moist density (g) and moisture content (w) if the soil becomes saturated at the same total volume, and (c) the density (p) of the soil if all pore fluid is dried off with no change in total volume. Provide the Phase Diagram.Two flow lines for seepage across an interface between two soil medium having different coefficient of permeability is as shown in the figure below. The entrance angle at the interface is 60° then: k, =1.0 x 10° m/s k -4 x 10 m/s (1) a (2) The exit angle az at interface is 67,55°, A Correct Option B The exit angle az at interface is 81.79, Correct Option The change in exit angle if 'k2' is reduced by 25% is 2.68°. D The change in exit angle if 'k2' is reduced by 25% is 1.78°.In a permeability test conducted on a soil with e = 0.50 the discharge velocity was found to be 2.4 * 10 ^ - 1cm / s The seepage velocity is: