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. If a falling head test were then made on the same soil, how much time in seconds would be taken for thehead to fall from 150 to 100 cm ?

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. If a falling head test were then made on the same soil, how much time in seconds would be taken for thehead to fall from 150 to 100 cm ?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.6P

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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.
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.
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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. If a falling head test were then made on the same soil, how much time in seconds would be taken for thehead to fall from 150 to 100 cm ?
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