Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 17, Problem 17.7P
a.
To determine
Calculate the required thickness of ties
b.
To determine
Find the maximum length of the tie
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Please explain
A reinforced-earth retaining wall is to be 10 m high. The following data are given:
y₁=16.0 kN/m³, ₁’=34°,
Y2=15.5 kN/m³, 2²=25°,
C₂ = 30 kN/m²
Backfill properties:
In-situ soil:
Reinforcement:
Vertical spacing, Sv=1 m,
Horizontal spacing, SH-1.25 m,
Width of reinforcement =120 mm,
(a)
In situ soil
72; 42; 02
fy=
= 260 MN/m², u²=25°,
Factor of safety against tie pullout and breaking = 3.0
Determine:
a) required thickness of ties
b) required maximum length of ties
c) factor of safety against overturning, and sliding.
ba
q/unit area
7
2= NSV
45 + ₁/2
Sv
Sy
-Sy
Sv
Sy
Sy
H
Sand
71
$₁
Question 2:
A gravity retaining wall is shown in figure below. Use ô'=2/3¢', and Coulomb's active earth
pressure theory.
Determine:
1. Factor of safety against overturning;
2. Factor of safety against sliding;
3. The pressure on the soil at the toe and heel.
Y = 18.5 kN/m³
4i = 32°
cj = 0
Use Yconcrete = 23.58 kN/m³
Note:
For Coulomb method, note that the weight 5 m
of the soil above the back face of the wall is
not taken into account in the resisting
5.7 m
P.
moment.
150
2.83 m -
----- Ph
75°
2.167 m
1.5 m
0.27 m 0.6 m
1.53 m
0.8 m
C'
Y2 = 18 kN/m³
$i = 24°
c = 30 kN/m²
0.8 m
0.3 m
- 3.5 m
%3D
Chapter 17 Solutions
Principles of Foundation Engineering (MindTap Course List)
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