A permeameter of 8.2cm diameter contains a sample of soil of lemgth 35cm. It can be used either for constant head or falling head tests. The standpipe used for the latter has a diameter of 2.5cm. In the constant head test the loss of head was 116cm measured on a length of 25cm when the rate of flow was 2.73ml/s. If a falling head test were then made on the same soil, how kuch time in seconds would be taken for the head to fall from 150 to 100cm?

A permeameter of 8.2cm diameter contains a sample of soil of lemgth 35cm. It can be used either for constant head or falling head tests. The standpipe used for the latter has a diameter of 2.5cm. In the constant head test the loss of head was 116cm measured on a length of 25cm when the rate of flow was 2.73ml/s. If a falling head test were then made on the same soil, how kuch time in seconds would be taken for the head to fall from 150 to 100cm?

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter9: In Situ Stresses

Section: Chapter Questions

Problem 9.11P

See similar textbooks

Similar questions

For a falling head laboratory test, the following are the given values:• Length of soil specimen = 210.00 mm• Initial head = 523.00 mm• Final head = 297.00 mm• Duration of test = 3.50 mins• Area of standpipe = 42.0 sq.mm• Area of specimen = 1050.00 sq.mmA. Compute for the hydraulic conductivity of the soil in cm/sec.B. Determine the seepage velocity if n=0.35C. Determine the head difference at t = 120 sec
A falling head hydraulic conductivity test is performed on a sample of soil. The standpipe having a diameter 0.2cm is observed and it takes 60 seconds for the water to drop to 50 cm from an initial hydraulic head of 90cm. The sample has a height of 20cm and a diameter of 4cm. Find the coefficient of permeability of soil.
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• Area of standpipe = 0.97 sq.cm• Area of specimen = 18.0 sq.cmA. Compute for the hydraulic conductivity of the soil in cm/sec.B. Determine the head difference at t = 3.50 mins.
The following data are for a falling-head permeability test:• Length of the soil sample = 150 mm• Area of soil sample = 1964 mm^2• Area of the standpipe = 25 mm^2• At time t = 0, head difference = 400 mm• At time t = 8 min, head difference = 200 mma. Determine the hydraulic conductivity of the soil (cm/sec). (ans. 2.75x10^-4 cm/s)b. What was the head difference at t = 6 min? (ans. 23.82cm)
A falling head hydraulic conductivity test is performed on a sample of soil. The standpipe having a diametre of 0.2 cm is observed and it takes 60 seconds for the water to drop by 50 cm from an initial hydraulic head of 90 cm. The sample has a lenght of 20 cm and a diameter of 4 cm. A. Find the coefficient of permeability of soil. B. Solve for the hydraulic gradient. C. Compute the rate of flow of water in the soil.
A permeameter of 8.2 cm diameter contains a sample of soil of length 35 cm. It can be used either for constant head or falling head tests. The standpipe used for the latter has a diameter of 2.5 cm. In the constant head test the loss of head was 116 cm measured on a length of 25 cm when the rate of flow was 2.73 ml/s. Find the coefficient of permeability of the soil in mm/s.
A permeameter of 8.2 cm diameter contains a sample of soil of length 35 cm. It can be used either for constant head or falling head tests. The standpipe used for the latter has a diameter of 2.5 cm. In the constant head test the loss of head was 116 cm measured on a length of 25 cm when the rate of flow was 2.73 ml/s. Find the coefficient of permeability of the soil in mm/s. a. 4.8 x 10^-1 b. 5.9 x 10^-2 c. 2.15 x 10^-2 d. 1.1 x 10^-1
For a falling head permeability test, these valueare 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 min is 500 mm Head difference at time, t = 3 min is 300 mm1. Determine the hydraulic conductivity of thesoil in cm/sec.2. What was the head difference at time, t =100 sec?
Q:5 a)Find out the flow rate from a soil when hydraulic conductivity is 2.5x10^-3 cm/sec while the length of soil sample is 11 cm, dia of soil sample is 5 cm, change in head observed is 3 cm.
A pumping test was carried out in confined aquifer thickness 2 m and the following measurement was recorded. Rate of pumping was 10 m^3/s; drawdown in pumping well was 2.0 m while on the observation well located at 15 m and 20 m from the centre of the pumping well were 1.6 m and 1.4 m, respectively. Determine the hydraulic conductivity of soil.
A soil sample 15 cm in diameter is placed In a tube 2 m long. A constant supply of water is allowed toflow into one end of the soil at A and the outflow at B is collected by a beaker. The average amount ofwater collected is 2 cubic centimeter every 5 seconds. The tube is inclined and has a head differenceof 2.5 m. Determine the following 1. Hydraulic Gradiant. 2. Flowrate in cm/s. 3. Discharge Velocity in cm/s. 4. Seepage velocity in cm/s if porosity is 0.420. 5. Hydraulic Conductivity.
In a constant-head permeability test, a 60 cm3 of water was collected in 25 seconds with ahead difference of 24.3 cm in a soil sample that has a diameter of 8 cm and length of 12 cm.Calculate the hydraulic conductivity. If the sample has a porosity of 60%, determine the averagevelocity and seepage velocity. Estimate the coefficient of permeability (cm/s) of a soil similar tothe sample with a porosity of 45% from the results of this test. Show your complete solution.