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MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 1 term (6 months)
9th Edition
ISBN: 9781305971226
Author: Braja M. Das; Khaled Sobhan
Publisher: Cengage Learning US
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Chapter 9, Problem 9.12P
(a)
To determine
Find the rate of upward seepage of water.
(b)
To determine
Find the effective stress
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Problem 4:
An inclined permeameter tube is filled with layers of soil of different permeability as shown below. Find the
total head, elevation head and pore water pressure at points (A-B-C-D) with respect to the given datum, Given:
1.5k1=2k2=3k3=k4
k4=2x10-3 cm/sec
35 сm
9 cm
K4
K3
K1
K2
15 cm
11 cm
7 cm
4 cm
Datum
شاشة
4cm
Figure 1.11
Practice Problem 2: Refer to Figure 1.12. If Hi = 1.5 m, H2 = 2.5 m, h = 1.5 m, e =0.49, Gs =
2.66, area of the tank = 0.62 m², and hydraulic conductivity of the sand (k) = 0.21 cm/sec.
a. What is the rate of upward seepage of water (m³/min)?
b. Will boiling occur when h = 1.5 m?
c. What would be the critical value of h to cause boiling?
%3D
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H
H2
Valve (open)
Inflow
Figure 1.12
(Situation 3) Determine the equivalent hydraulic conductivity of the soil strata given in the figure considering direction of flow of water parallel and
perpendicular to the layers.
k = 2.3 x 102 cm/s
k, = 8 x 102 cm/s
k, = 5.7 x 10 cm/s, k, = 25.5 x 104 cm/s
10 m
2 m!
= 9.2 x 10 cm/s
k, = 27 x 107 cm/s
10 m
%3!
Chapter 9 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, SI Edition, 9th Edition, [Instant Access], 1 term (6 months)
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- Soil layers are shown as the right figure. Given: H1 = 2 m, k1 = 10-4 cm/sec H2 = 3 m, k2 = 3.2 x 10-2 cm/sec H3 = 4 m, k3 = 4.1 x 10-5 cm/sec Estimate the ratio of horizontal equivalent hydraulic conductivity and vertical equivalent hydraulic conductivity, i.e., Ky/Kz H2 k2 H3 k3 O 140 O 270 O 225 O 152 Question 2 4 pts The results ofa constant-head permeability test for a sand sample having a sectional area of 10000mm2 and a length of 200 mm are as follows: (1) Constant head difference 400mm (2) Time of collection of water = 30 seconds (3) Volume of water collected = 600 cm3. The hydraulic conductivity is: O 1.7mm/sec O 2.9 mm/sec O 0.5mm/sec O 1.0 mm/secarrow_forwardSoil layers are shown as the right figure. Given: H₁ = 2 m, k₁ = 10-4 cm/sec H₂ = 3 m, K₂ = 3.2 x 10-² cm/sec H₂ = 4 m, K₂ = 4.1 x 10-5 cm/sec Estimate the ratio of horizontal equivalent hydraulic conductivity and vertical equivalent hydraulic conductivity, i.e., k./k₂ T * H₂ H₂ a. 152 Ob. 270 O c. 140 O d. 225 k₁ k₂ k3arrow_forwardH k, H, H k, H A layered soil is shown in the figure above. Estimate the equivalent hydraulic conductivity for flow in the vertical direction. Suppose that ki = 5.0 ×10¬4 cm/s, k2 = 4.0 ×10-4 cm/s, k3 = 4.0 ×10-4 cm/s, k4 = 1.0 ×10¬4 cm/s, Н - 2.0 m. H, - 2.0 m. Hз - 2.5 m. На - 2.5 m. (Enter your answer to three significant figures.) kyle) cm/sarrow_forward
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