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In a falling head permeameter, tge sample used is 18cm long havibg a cross sectional area of 22cm^2. The sample of soil is mqde of three layers. The thickness of the first layer from the top is 8cm and has a value of k1=4x10^-4 cm/sec, the second layer of thickness 8cm has k2=5.5x10^-4 cm/sec and the bottom later of thickness 4 cm has k3=7x10^-4 cm/sec. Assume that the flow is taking place perpendicular to the layers. The cross sectional area of the stand pipe is 3cm^2. A.Calculate the equivalent coefficient permeability in cm/sec of the soils ib tye direction of the flow Choices: 4.44 x10^-4 cm/s 4.97x10^-4 cm/s 3.24x10^-4 cm/s 3 53x10^-4 cm/s B.Calculate the flow rate in cm^3/hr when the head drops from 25cm to 12cm Choices: 18.20,24.58,28.42,20.65 C.Calculate the time recquired for a drop of head from 25 cm to 12 cm Choices: 58.22,62.91,97.05,60.44

In a falling head permeameter, tge sample used is 18cm long havibg a cross sectional area of 22cm^2. The sample of soil is mqde of three layers. The thickness of the first layer from the top is 8cm and has a value of k1=4x10^-4 cm/sec, the second layer of thickness 8cm has k2=5.5x10^-4 cm/sec and the bottom later of thickness 4 cm has k3=7x10^-4 cm/sec. Assume that the flow is taking place perpendicular to the layers. The cross sectional area of the stand pipe is 3cm^2. A.Calculate the equivalent coefficient permeability in cm/sec of the soils ib tye direction of the flow Choices: 4.44 x10^-4 cm/s 4.97x10^-4 cm/s 3.24x10^-4 cm/s 3 53x10^-4 cm/s B.Calculate the flow rate in cm^3/hr when the head drops from 25cm to 12cm Choices: 18.20,24.58,28.42,20.65 C.Calculate the time recquired for a drop of head from 25 cm to 12 cm Choices: 58.22,62.91,97.05,60.44

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter12: Subsurface Exploration
Section: Chapter Questions
Problem 12.13P
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In a falling head permeameter, tge sample used is 18cm long havibg a cross sectional area of 22cm^2. The sample of soil is mqde of three layers. The thickness of the first layer from the top is 8cm and has a value of k1=4x10^-4 cm/sec, the second layer of thickness 8cm has k2=5.5x10^-4 cm/sec and the bottom later of thickness 4 cm has k3=7x10^-4 cm/sec. Assume that the flow is taking place perpendicular to the layers. The cross sectional area of the stand pipe is 3cm^2. A.Calculate the equivalent coefficient permeability in cm/sec of the soils ib tye direction of the flow Choices: 4.44 x10^-4 cm/s 4.97x10^-4 cm/s 3.24x10^-4 cm/s 3 53x10^-4 cm/s B.Calculate the flow rate in cm^3/hr when the head drops from 25cm to 12cm Choices: 18.20,24.58,28.42,20.65 C.Calculate the time recquired for a drop of head from 25 cm to 12 cm Choices: 58.22,62.91,97.05,60.44
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