A falling head permeability test was carried out on a 15cm long of silty clay. The diameter of the sample and the stand pipe were 9.8cm and 0.75cm respectively. The water level in the stand pipe was observed to fall from 7ocm to 45cm in 12minutes. Determine the coefficient of permeability of the soil in m/day and the height of water level in stand pipe after 20minutes.

A falling head permeability test was carried out on a 15cm long of silty clay. The diameter of the sample and the stand pipe were 9.8cm and 0.75cm respectively. The water level in the stand pipe was observed to fall from 7ocm to 45cm in 12minutes. Determine the coefficient of permeability of the soil in m/day and the height of water level in stand pipe after 20minutes.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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In a falling head permeability test, the following data was obtained: diameter of standpipe = 1.5 cm; diameter of sample = 10.16 cm; height of water level at beginning of test (h1) = 30 cm; length of sample (L) = 20 cm. The soil had a coefficient of permeability (k) equal to 3.4 x 10°cm/sec. If the test was conducted for a period of 8 hours, what was the water level at the end of the test (h2)? %3D Time when water level is at h, is t, (t,) a = area of standpipe Time when level is at 19% h, is t2 (t2) A = cross-sectional area of soil sample Soil sample
The results of a constant head permeability test for a fine sand are as follows: Diameter of the sample = 31 cm Length of sample = 98 cm Constant head difference = 52 cm Time of collection = 364 secs Weight of water collected = 448 grams Find the seepage velocity in cm/min. if the void ratio is 0.33. Round off to four decimal places. Answer: 0.3943
PROBLEM D For a falling head laboratory test, the following are the given values: • Length of soil specimen 480.0 mm Initial head 700.00 mm = Final head = 395.00 mm Duration of test = 5.5 mins 0.97 sq.cm Area of standpipe Area of specimen 18.0 sq.cm A. Compute for the hydraulic conductivity of the soil in cm/sec. B. Determine the head di fference at t = 3.50 mins.
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.
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).
Tina 20 Two soil specimens with identical geometric dimensions were subjected to falling head permeability tests in the laboratory under identical conditions. The fall of water head was measured after an identical time interval. The ratio of initial to final water heads for the test involving the first specimen was 1.25. If the coefficient of permeability of the second specimen in 5 times that of the first, the ratio of initial to final water heads in the test involving the second specimen is
21 The results of a constant head permeability test for a fine sand are as follows: Diameter of the sample = 37 cm Length of sample = 92 cm Constant head difference = 78 cm Time of collection = 337 secs Weight of water collected = 375 grams Find the seepage velocity in cm/min. if the void ratio is 0.6. Round off to four decimal places.
For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen: 18 cm. Diameter of specimen: 95 mm. Constant head difference: 54 cm. Volume of water collected in 4.10 min.: 423 cc Void ratio of the soil specimen: 0.54 Determine the seepage velocity in m/min.
For a constant head laboratory permeability test on a fine sand, the following values are given: Length of specimen, L:6.75 in Diameter of specimen: 4 in Head difference,h: 23 in Water collected in 6 mins: 0.917in³ Void Ratio:0.23 Find the seepage velocity (Vs) in in/min