For a falling or variable head permeability test, the following are given: Length of soil specimen = 12 cm. Cross sectional area of stand pipe: A = 0.018 cm2 Diameter of soil specimen = 7.5 cm. Time of collection of water: t = 65 sec. Head difference at time t = 0; h1 = 70 cm. Head difference at time t = 65 sec; h2 = 40 cm. Temperature of water: 14 ֯C Find the absolute permeability of the soil at 20 ֯C.

For a falling or variable head permeability test, the following are given: Length of soil specimen = 12 cm. Cross sectional area of stand pipe: A = 0.018 cm2 Diameter of soil specimen = 7.5 cm. Time of collection of water: t = 65 sec. Head difference at time t = 0; h1 = 70 cm. Head difference at time t = 65 sec; h2 = 40 cm. Temperature of water: 14 ֯C Find the absolute permeability of the soil at 20 ֯C.

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 7.14P

See similar textbooks

Similar questions

6- For a falling-head permeability test, the following are given: Length of soil specimen= 700 mm • Area of the soil specimen=20 cm² Area of the standpipe= 1.05 cm² Head difference at time t = 0 is 800 mm . . • Head difference at time t= 8 min is 500 mm a. Determine the absolute permeability of the soil. b. What is the head difference at time 6 min? = Assume that the test was conducted at 20= °C, and at 20= °C, Yw- 9.789 kN/m³ and n=1.005x10³ Ns/m².
For a falling-head permeability test, the following are given: • Length of soil specimen = 700 mm • Area of the soil specimen = 20 cm2 • Area of the standpipe = 1.05 cm² || Head difference at time t = 0 is 800 mm Head difference at time t = 8 min is 500 mm a. Determine the absolute permeability of the soil. b. What is the head difference at timet = 6 min? %D Assume that the test was conducted at 20 degree C, and at 20 degree C, unit weight of water = 9.789 kN/m³ and viscosity of water is 1.005 x 103 N- s/m? .
Question 3 4 pts Assuming the groundwater table is at ground surface and the soil bulk unit weight is 20KN/m3. At 2m depth below ground level. The pore water pressure is approximately: 200 kPa O 9.8 kPa O 98 kPa O 19.6 kPa Question 4 4 pts A soil sample is placed in a 1m long and 10cm diameter tube. A constant supply of water is allowed to flow from inlet to outlet. The total water head at the inlet is 2m and the total water head at the outlet is 1m. The hydraulic conductivity is 0.001 cm/s. Which of the following answer is correct? O The flow velocity is 25 cm/s O The hydraulic gradient in the tube is 2 O The flow velocity is 0.001 cm/s O The hydraulic gradient in the tube is 0.001
Determine the coefficient of permeability of the soil. For a falling- head permeability test, the following are given: re Length of the specimen = 115.5 mm Diameter of soil specimen =104.7 mm Diameter of the stand pipe = 15 mm Head difference at time t=0 is 1360 mr Head difference at timet=78600 sec is 820 mm
a. The hydraulic head in the 1.1 cm diameter standpipe through which test water passed dropped from 87.5 cm to 587 mm in half a minute of observation. in that duration, the water was collected in the graduated flask. Evaluate the diameter (mm) of soil specimen, if the perimeter in a falling head permeability test set up involves a cylindrical soil sample having a height of 18.4 cmn. Coefficient of permeability of soil sample evaluated is 0.23 m hr.
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 sec
For a falling head permeability test, these values are given: Length of the soil specimen = 200 mmArea of the soil specimen = 1000 mm2Area of the standpipe = 40 mm2Head difference at time t = 0 is 500 mmHead difference at time t = 3 min is 300 mm Determine: Hydraulic conductivity of the soil in cm/sec.Head difference at time t = 100 sec.
2. For a falling head permeability test, the following are given. Length of specimen is 380 mm, are of specimen = 6.5 cm², hydraulic conductivity of soil specimen is 0.175 cm/min. a. What should be the area of the stand pipe for the head to drop from 650 cm to 300 cm in 8 min? b. Compute the the interstitial velocity under the test condition if the soil specimen has a void ratio of 0.50 in cm/sec. the head difference at time equal to 6 min. c. Compute
Prob. A falling head permeability test was performed on a sample of silty sand. The time required for the head to fall in the standpipe from the 60 cm to 30 cm mark was 70 minutes. The sectional area of the standpipe was 1.25 cm?. If the height and diameter of the sample were respectively 100 mm and 90 mm, determine the value of K.
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)
For a falling head permeability test, the following are given. Length of specimen is 380 mm, area of specimen = 6.5 cm2, hydraulic conductivity of the soil specimen is 0.017 cm/min. If the test temperature is 30 degrees Celsius, compute the corrected coefficient of permeability in cm/sec. A 0.035 0.028 0.021 0.014 B.
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.