Consider the setup below in which three different soil layers, each 200 mm in length, are located inside a cylindrical tube of diameter 150 mm. A constant-head difference of 470 mm is maintained across the soil sample. The porosities and hydraulic conductivities of the three soils in the direction of the flow are as given in the following table: Soil I II n 0.5 0.6 0.33 k (cm/sec) 5 x 10-³ 4.2 x 10² 3.9 x 10 Perform the following tasks: a. Determine the quantity of water flowing through the sample per hour. b. Denoting the downstream water level (Y-Y) to be the datum, determine the elevation head, pressure head, and the total head at the entrance and exit of each soil layer. c. Plot the variation of the elevation head, pressure head and the total head with the horizontal distance along the sample axis (X-X). d. Plot the variations of discharge velocity and the seepage velocity along the sample axis. e. What will be the height of the vertical columns of water inside piezometers A and B installed on the sample axis? Water supply Soil I Soil II B Soil III 200 mm 200 mm 200 mm Constant-head difference = 470 mn 220 mm

Consider the setup below in which three different soil layers, each 200 mm in length, are located inside a cylindrical tube of diameter 150 mm. A constant-head difference of 470 mm is maintained across the soil sample. The porosities and hydraulic conductivities of the three soils in the direction of the flow are as given in the following table: Soil I II n 0.5 0.6 0.33 k (cm/sec) 5 x 10-³ 4.2 x 10² 3.9 x 10 Perform the following tasks: a. Determine the quantity of water flowing through the sample per hour. b. Denoting the downstream water level (Y-Y) to be the datum, determine the elevation head, pressure head, and the total head at the entrance and exit of each soil layer. c. Plot the variation of the elevation head, pressure head and the total head with the horizontal distance along the sample axis (X-X). d. Plot the variations of discharge velocity and the seepage velocity along the sample axis. e. What will be the height of the vertical columns of water inside piezometers A and B installed on the sample axis? Water supply Soil I Soil II B Soil III 200 mm 200 mm 200 mm Constant-head difference = 470 mn 220 mm

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

100%

Consider the setup below in which three different soil layers, each 200 mm in length, are
located inside a cylindrical tube of diameter 150 mm. A constant-head difference of 470 mm is
maintained across the soil sample. The porosities and hydraulic conductivities of the three soils
in the direction of the flow are as given in the following table:
Soil
I
n
0.5
0.6
0.33
Water supply
k (cm/sec)
5 x 10-³
4.2 × 10 2
3.9 X 10+
Perform the following tasks:
a. Determine the quantity of water flowing through the sample per hour.
b. Denoting the downstream water level (Y-Y) to be the datum, determine the elevation head,
pressure head, and the total head at the entrance and exit of each soil layer.
c. Plot the variation of the elevation head, pressure head and the total head with the horizontal
distance along the sample axis (X-X).
d. Plot the variations of discharge velocity and the seepage velocity along the sample axis.
e. What will be the height of the vertical columns of water inside piezometers A and B installed
on the sample axis?
Soil I
A
Soil II
B
Soil III
200 mm 200 mm 200 mm
X
Constant-head
difference = 470 mn
220 mm

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