A constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50 cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%,

A constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50 cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%,

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

A constant-head test was conducted on a sample of soil
15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50 cm3
in 20 seconds under a head difference of 24 cm.

Calculate the hydraulic conductivity.

If the porosity of the sand is 55%,

calculate the average velocity and the seepage velocity.

Estimate the hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test.

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A constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%, calculate the average velocity and the seepage velocity. Estimate the’ hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test.
A constant-head test was conducted on a sample of soil 15 cm long and 60 cm2 in cross-sectional area. The quantity of water collected was 50 cm3 in 20 seconds under a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of the sand is 55%, calculate the average velocity and the seepage velocity. Estimate the hydraulic conductivity of a similar soil with a porosity of 35% from the results of this test. What is the soil type tested?
In a constant-head permeability test, a sample of soil 12 cm long and 6 cm in diameter discharged 1.5 x 10^(-3) m^3 of water in 10 minutes. The head difference in two piezometers A and B located at 1 cm and 11 cm, respectively, from the bottom of the sample is 2 cm. Determine the hydraulic conductivity of the soil. What is the soil type tested?
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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.
For a variable head permeability test, these values are 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 is 500 mm• Head difference at time t 3 min is 300 mma. Determine the hydraulic conductivity of the soil in cm/sec.b. What was the head difference at time t 100 sec?
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