In the falling head permeability test, in duration of 4 hours the initial head of 950 mm is dropped to 300 mm. The diameter of the stand pipe is 0.6 cm. The length and diameter of the soil specimen are 20 cm and 10 cm respectively. What is the coefficient of permeability (mm/s) of the soil?

In the falling head permeability test, in duration of 4 hours the initial head of 950 mm is dropped to 300 mm. The diameter of the stand pipe is 0.6 cm. The length and diameter of the soil specimen are 20 cm and 10 cm respectively. What is the coefficient of permeability (mm/s) of the soil?

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 6.7P

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Concept explainers

Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.

Question

In the falling head permeability test, in
duration of 4 hours the initial head of 950 mm
is dropped to 300 mm. The diameter of the
stand pipe is 0.6 cm. The length and diameter
of the soil specimen are 20 cm and
10 cm respectively. What is the coefficient of
permeability (mm/s) of the soil?

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