Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Question
Chapter 7, Problem 7.3P
(a)
To determine
The rate of seepage per unit length of the dam.
(b)
To determine
The seepage velocity.
(c)
To determine
The quantity of seepage per day for 350 m long dam.
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3 Seepage is occurring through the sandy layer underneath the concrete dam as
shown in Figure 7.30.
Concrete dam
H₁
Seepage
H₂ H₂
Sandy layer
Impervious rock
PXSXX2X
L
Figure 7.30
Given: upstream water level, H₁ = 16 m; downstream water level, H₂ = 2.3 m;
thickness of the sandy layer, H, = 0.75 m; hydraulic conductivity of the
sandy layer, k = 0.009 cm/sec; void ratio of sand, e = 0.8; and L = 45 m.
Determine:
a. Rate of seepage per unit length of the dam (in m³/hr/m)
b. Seepage velocity
c. Quantity of seepage per day if the dam is 350 m long
a. For Figure 2 below, calculate the effective hydraulic conductivity for flow parallel and
perpendicular to layering. Show your work. Explain the difference in values.
Figure 2
sand layer; K = 1 m/d; thickness = 5
d 10.5 m
clay layer; K = 0.000001 m/d; thickness = 0.5 m
sand laver: K = 1 m/d; thickness = 5 m
b. Figure 3 below shows the effects of groundwater refraction, assuming that groundwater flow
in the top layer is almost horizontal i.e., a = 89.8°, what is B and what can you say about the flow
in the clay layer?
a
a
K,
b
B
K
Figure 3.
CVE 331: Theoretical hydraulic conductivity calculation
Problem 1: The hydraulic conductivity of a sandy sol is 7x10 cm/sec at void ratio 0.68. What is the
hydraulic conductivity at void ratio 0.85 ?
(o.re)
A= 2,42e
k2
ei
Problem 2: The hydraulic conductivity of a clay soil is 121o* cm/sec at void ratio 0.56, and 3.1x10
cm/sec at void ratio 0.74. What is the hydraulic conductivity the soll at void ratio 0.65 ?
e3
ki
%3D
- 3. 797
GRAIN SIZE DISTRIBUTION GRAPH. A-
PROJECE
Chapter 7 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 7 - Prob. 7.1PCh. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - Prob. 7.5PCh. 7 - Prob. 7.6PCh. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - Prob. 7.13PCh. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16PCh. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Prob. 7.21PCh. 7 - Refer to Figure 7.24. The following data were...Ch. 7 - Prob. 7.23PCh. 7 - Prob. 7.1CTP
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