Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 7, Problem 7.7CTP
To determine
Find the quantity of water has to pumped out per meter length per day.
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EXAMPLE 8.4
Two sheet piles were driven 4 m apart into clayey sand, as shown in Figure 8.9, and
a 2 m depth of soil between the two sheet piles was removed. To facilitate some
proposed construction work, the region between the sheet piles is being dewatered
where the water level is lowered to the excavation level by pumping out water con-
tinuously. Assuming the hydraulic conductivity of the clayey sand as 2 x 10-6 cm/s,
estimate the quantity of water that has to be pumped out per meter length per day.
4.0 m
2.5 m
2.0 m
3.0 m
FIGURE 8.9
Sheet pile
Impervious stratum
Ground Level
Clayey sand
A flow net for flow around a single row of sheet piles in a permeable soil layer is
shown in Figure below with a scale as shown. Given that kx = kz=k = 4 x 10-3
cm/sec, determine
How high (above the ground surface) the water will rise if piezometers are placed at points a and b
The total rate of seepage through the permeable layer per unit length
The approximate average hydraulic gradient at c
factor of safety against piping
x=1.6 y=2.8
Question:
A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in
Figure 1. Given that
k = 5 + 10-5 mm/sec
Ya = 20 kN/m³
w = 21%
n = 20%
Determine,
a) How high [m] the water will rise if piezometer is placed at point B (above point B).
b) The total rate of seepage [m/s/m] through the permeable layer per unit length.
c) Magnitudes of effective vertical stress [kN/m³] at A and B.
Sheet
piling
4.00 m
8.00 m
1.00 m
11.00 m
FC
6.00 m
8.00 m
Datum
Figure 1
Chapter 7 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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