A constant head permeability test was carried out on a cylindrical sample of sand 4 in. in diameter and 6 in. in height. 10 in3 of water was collected in 1.75 min, under a head of 12 in. Compute the hydraulic conductivity in ft/year and the velocity of flow in ft/sec.

A constant head permeability test was carried out on a cylindrical sample of sand 4 in. in diameter and 6 in. in height. 10 in3 of water was collected in 1.75 min, under a head of 12 in. Compute the hydraulic conductivity in ft/year and the velocity of flow in ft/sec.

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

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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

Problem 2
A constant head permeability test was carried out on a cylindrical sample of sand 4 in. in diameter and 6
in. in height. 10 in3 of water was collected in 1.75 min, under a head of 12 in. Compute the hydraulic
conductivity in ft/year and the velocity of flow in ft/sec.
Problem 3.
A sand sample of 35 cm2 cross sectional area and 20 cm long was tested in a constant head
permeameter. Under a head of 60 cm, the discharge was 120 ml in 6 min. The dry weight of sand used
for the test was 1 120 g, and Gs = 2.68. Determine (a) the hydraulic conductivity in cm/sec, (b) the
discharge velocity, and (c) the seepage velocity.

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