A test is set-up as shown in the figure. A cylindrical mold 4" in diameter is filled with silt toheight H₁ = 0.2 ft, whose coefficient of permeability k₁ = 3.6 x 104 ft/min.A second coaxial mold is placed on top of the first mold whose inside diameter is d = 1.5"and whose height is H₂ = 0.30 ft. Its thickness is negligible. The inside of this second mold isfilled with the same silt, but the annular ring outside the small tube and outer tube is filled withsand whose coefficient of permeability is k2₂ =2.7 x 10-³ ft/min.The test set-up is a permeameter of constant head. Water is placed in the mold and maintainedat a level h = 1.25 ft. above the level of the outlet. It may be considered that the system consistsof a fictitious soil of thickness H= H₁ + H₂ and coefficient of permeability kf.Water.WaterSandSiltDPorous stoneH₂H₁Hha)What is the equivalent coefficient of permeability, kf, in ft/min?b) What is the total flow of water in ft³/min?c) What is the total amount of water that percolated after 55 minutes?

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A test is set-up as shown in the figure. A cylindrical mold 4" in diameter is filled with silt to height H₁ = 0.2 ft, whose coefficient of permeability k₁ = 3.6 x 104 ft/min. A second coaxial mold is placed on top of the first mold whose inside diameter is d = 1.5" and whose height is H₂ = 0.30 ft. Its thickness is negligible. The inside of this second mold is filled with the same silt, but the annular ring outside the small tube and outer tube is filled with sand whose coefficient of permeability is k₂ = 2.7 x 10³ ft/min. The test set-up is a permeameter of constant head. Water is placed in the mold and maintained at a level h = 1.25 ft. above the level of the outlet. It may be considered that the system consists of a fictitious soil of thickness H = H₁ + H₂ and coefficient of permeability kf. Water. Water Sand Silt D Porous stone H₂ H h a) What is the equivalent coefficient of permeability, kf, in ft/min? b) What is the total flow of water in ft³/min? c) What is the total amount of water that percolated after 55 minutes?

A test is set-up as shown in the figure. A cylindrical mold 4" in diameter is filled with silt to height H₁ = 0.2 ft, whose coefficient of permeability k₁ = 3.6 x 104 ft/min. A second coaxial mold is placed on top of the first mold whose inside diameter is d = 1.5" and whose height is H₂ = 0.30 ft. Its thickness is negligible. The inside of this second mold is filled with the same silt, but the annular ring outside the small tube and outer tube is filled with sand whose coefficient of permeability is k₂ = 2.7 x 10³ ft/min. The test set-up is a permeameter of constant head. Water is placed in the mold and maintained at a level h = 1.25 ft. above the level of the outlet. It may be considered that the system consists of a fictitious soil of thickness H = H₁ + H₂ and coefficient of permeability kf. Water. Water Sand Silt D Porous stone H₂ H h a) What is the equivalent coefficient of permeability, kf, in ft/min? b) What is the total flow of water in ft³/min? c) What is the total amount of water that percolated after 55 minutes?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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 test is set-up as shown in the figure. A cylindrical mold 4" in diameter is filled with silt to
height H₁ = 0.2 ft, whose coefficient of permeability k₁ = 3.6 x 104 ft/min.
A second coaxial mold is placed on top of the first mold whose inside diameter is d = 1.5"
and whose height is H₂ = 0.30 ft. Its thickness is negligible. The inside of this second mold is
filled with the same silt, but the annular ring outside the small tube and outer tube is filled with
sand whose coefficient of permeability is k2₂ =2.7 x 10-³ ft/min.
The test set-up is a permeameter of constant head. Water is placed in the mold and maintained
at a level h = 1.25 ft. above the level of the outlet. It may be considered that the system consists
of a fictitious soil of thickness H= H₁ + H₂ and coefficient of permeability kf.
Water.
Water
Sand
Silt
D
Porous stone
H₂
H₁
H
h
a)
What is the equivalent coefficient of permeability, kf, in ft/min?
b) What is the total flow of water in ft³/min?
c) What is the total amount of water that percolated after 55 minutes?

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