For the retaining wall shown in the first picture, compute the factors of safety against overturning and sliding (analyze the latter both with and without passive earth pressure at the toe). Also determine the soil pressure at the base of the wall. Use the Rankine equation to compute passive earth pressure.
For the retaining wall shown in the first picture, compute the factors of safety against overturning and sliding (analyze the latter both with and without passive earth pressure at the toe). Also determine the soil pressure at the base of the wall. Use the Rankine equation to compute passive earth pressure.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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For the retaining wall shown in the first picture, compute the factors of safety against overturning and sliding (analyze the latter both with and without passive earth pressure at the toe). Also determine the soil pressure at the base of the wall. Use the Rankine equation to compute passive earth pressure.
Transcribed Image Text:18 ft
THIR
3 ft
3 ft
FIGURE 12-25
tisit
18⁰
Backfill Material:
Broken Stone, i.e., Type 1 Soil (See Figure 12-3)
Y=115 lb/ft³
Coefficient of Base Friction = 0.58
= 35°
Concrete
5.5 ft
2 ft
11
KALOS
Transcribed Image Text:B
K₂H²
+AH²
b
B
Z K₂H²
K₁,H²
Flo
ANZANIA
H
WIE
3
H
k, (lb/ft²/ft)
qola
Values of kn, (lb/ft²/ft)
80
60
40
20
160
0
q/1102
140
sol2 unaszeM
120
100
80
60
40
20
0
6:1
1
10
4
(+)
4
3:1 maximum
3:1
2:1 maximum
2:1 maximu
2:1
4
20
30
Values of Slope Angle 3°
FIGURE 12-3 Earth pressure charts for retaining walls less than 20 ft (6 m) high
(1 lb/ft²/ft = 0.1571 kN/m²/m). Notes: Numerals on curves indicate soil types as described
here. For material of Type 5, computations should be based on value of H 4 ft less than actual
value. Types of backfill for retaining walls: Coarse-grained soil without admixture of fine soil
particles, very free-draining (clean sand, gravel, or broken stone); coarse-grained soil of low
permeability, owing to admixture of particles of silt size; 3 fine silty sand, granular materials
with conspicuous clay content, or residual soil with stones; 4 soft or very soft clay, organic
silt, or soft silty clay; medium or stiff clay that may be placed in such a way that a negligible
amount of water will enter the spaces between the chunks during floods or heavy rains.
Source: Manual of Recommended Practice, Construction and Maintenance Section, Engineering Division, Association
of American Railroads, Chicago, 1958. Reprinted by permission.
40
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