EBK FUNDAMENTALS OF GEOTECHNICAL ENGINE
5th Edition
ISBN: 8220101425829
Author: SIVAKUGAN
Publisher: CENGAGE L
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Question
Chapter 17, Problem 17.1P
(a)
To determine
Whether the statement “Poisson’s ratio of any saturated clay is 0.5” is true or false.
(a)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • Poisson’s ratio is the measure of lateral expansion or contraction compared to longitudinal contraction or expansion.
- • The expansion and contraction of saturated clay is very low. Hence, there is no variation of Poisson’s ratio in the saturated clay.
Therefore, the given statement is
(b)
To determine
Whether the statement “A flexible foundation carrying a uniform pressure will settle uniformly” is true or false.
(b)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • A flexible foundation produces a sagging profile of settlement when it is loaded with uniform pressure.
- • In the sagging profile, the settlement at mid-point is higher than the corner. Hence, the differential settlement occurs in the flexible foundation.
Therefore, the given statement is
(c)
To determine
Whether the statement “A rigid foundation settling uniformly will not apply uniform pressure to the soil” is true or false.
(c)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • The pressure is redistributed at the area of contact between the foundation and soil for a rigid foundation with uniform settling.
- • Hence, the pressure is not applied uniformly to the soil.
Therefore, the given statement is
(d)
To determine
Whether the statement “The soil stiffness beneath a continuous foundation on sands is more than that of a square foundation of the same width” is true or false.
(d)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • The contact area between the soil and the continuous foundation is more than the square foundation.
- • Hence, the stiffness is more in continuous foundation compared to square foundation of the same width.
Therefore, the given statement is
(d)
To determine
Whether the statement, “Strain beneath a footing on sands is the maximum at the footing level” is true or false.
(d)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • Generally, the strain varies from zero at the bottom of footing and maximum at 0.5B depth and then becomes zero at the 2B depth. Here, B is the breadth of footing.
- • Also, according to Schmertmann’s method of strain variation, the strain will be zero at the footing level.
Therefore, the given statement is
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A gravity retaining wall is shown in the figure below. Calculate the factor of safety with respect to overturning and sliding, given the following data:
Wall dimensions: H = 6 m, x1 = 0.6 m, x2 = 2 m, x3 = 2m,
x4 0.5 m, x5 = 0.75 m, x6 = 0.8 m, D= 1.5 m
Soil properties: 71 = 15.5 kN/m³, ₁ = 32°, Y2 = 18 kN/m³,
2=22°, c₂ = 40 kN/m²
H
x6
X2 TXT
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Use Coulomb's active earth pressure in your calculation and let ' = 2/3 01. Use Yconcrete = 23.58 kN/m³. Also, use k₁ = k₂ = 2/3 and P = 0 in equation
FS (sliding)
(ΣV) tan(k₁₂2) + Bk2c + Pp
Pa cos a
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For the cantilever retaining wall shown in the figure below, let the following data be given:
Wall dimensions: H = 6.5 m, x1 = 0.3 m, x2 = 0.6 m, x3 = 0.8 m,
x4 2 m, x5 = 0.8 m, D= 1.5 m, a = 0°
Soil properties: 71 = 17.08 kN/m³, ₁ = 36°, Y2 = 19.65 kN/m³,
2 = 15°, c₂ = 30 kN/m²
For 2=15°: N = 10.98; N₁ = 3.94; N₁ = 2.65.
x2
..
c₁ = 0
Φί
H
x5
Calculate the factor of safety with respect to overturning, sliding, and bearing capacity. Use Yconcrete = 24.58 kN/m³. Also, use k₁ = k2 = 2/3 and P₂ = 0 in equation
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FS (sliding)
Pa cos a
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=
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B) Clearwell Operation Style: Parallel (to provide contact time for disinfection
using free chlorine (derived from a hypochlorite solution generated onsite).
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Chapter 17 Solutions
EBK FUNDAMENTALS OF GEOTECHNICAL ENGINE
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