Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
Chapter 14, Problem 14.9P
(a)
To determine
Draw the variation of Rankine’s active pressure on the wall with depth.
(b)
To determine
Find the depth up to which, a tensile crack can occur.
(c)
To determine
Find the total active force per unit length of the wall before the tensile crack occurs.
(d)
To determine
Find the total active force per unit length of the wall after the tensile crack occurs.
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A retaining wall 6 m high with a vertical back face retains a homogeneous saturated soft clay. The saturated unit weight of the clay is 19.8 kN/m^3. Laboratory tests showed that the undrained shear strength, cu, of the clay is 14.7 kN/m^2.
a. Do the necessary calculations and draw the variation of Rankine’s active
pressure on the wall with depth.
b. Find the depth up to which a tensile crack can occur.
c. Determine the total active force per unit length of the wall before the tensile crack occurs.
d. Determine the total active force per unit length of the wall after the tensile crack occurs. Also find the location of the resultant.
Considering that the horizontal thrust from the back of a 5.5 m wide brick wall to the 1 m deep part of the wall is H = 55 kN
a) Find the greatest stress in the base when b = 2 m.b) Find the width b so that there is a shrinkage zone at the base.(Note: unit weight of brick wall ỿ = 24 kN / m3 )
Answer: ϭmax=0,30 Mpa, b=2,23 m
Determine the average stress increase below the center of the loaded area, between z = 3 m and z =
5 m.
5 m
3 m
q=100 kN/m²
L
1.5 m
1.5 m
A
J
SECTION
3 m
B
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A
3 m
PLAN VIEW
Chapter 14 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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