11.2 Figure 11.21 shows a retaining wall with cohesionless soil backfill. For cases a through c, determine the following: total active force per unit length of the wall for Rankine's state, the location of the resultant, and the variation of the active pressure with depth. a. H= 10 ft, y = 110 lb/ft³, o' = 32° b. H= 12 ft, Y c. H = 18 ft, y = 115 lb/ft’, o' = 40° = 98 lb/ft, o' = 28° %3D
11.2 Figure 11.21 shows a retaining wall with cohesionless soil backfill. For cases a through c, determine the following: total active force per unit length of the wall for Rankine's state, the location of the resultant, and the variation of the active pressure with depth. a. H= 10 ft, y = 110 lb/ft³, o' = 32° b. H= 12 ft, Y c. H = 18 ft, y = 115 lb/ft’, o' = 40° = 98 lb/ft, o' = 28° %3D
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Q 11.2
Transcribed Image Text:Problems
11.1 State whether the following are true or false.
a. The higher the friction angle, the higher the value of K.
b. K, is greater for normally consolidated clays than for overconsolidated clays.
c. The active earth-pressure coefficient is greater than the passive one.
d. The larger the cohesion, the larger is the depth of the tensile cracks in clays in the
active state.
e. Lateral earth pressures increase linearly with depth.
11.2 Figure 11.21 shows a retaining wall with cohesionless soil backfill. For cases a through c,
determine the following: total active force per unit length of the wall for Rankine's state, the
location of the resultant, and the variation of the active pressure with depth.
a. H = 10 ft, y = 110 lb/ft, '' = 32°
b. H = 12 ft, y = 98 lb/ft, '
c. H = 18 ft, y = 115 lb/ft’, o' = 40°
11.3 Assuming that the wall shown in Figure 11.21 is restrained from yielding, find the magnitude
and location of the resultant lateral force per unit length of the wall for the following cases:
a. H = 8 ft, y = 105 lb/ft', o' = 34°
b. H= 14 ft, y = 108 lb/ft', o' = 36°
11.4 Referring to Figure 11.21, determine the passive force, P per unit length of the wall for
Rankine's state. Also state the Rankine passive pressure at the bottom of the wall. Given the
following cases:
28°
%3D
63°F Cloud
Transcribed Image Text:Sand
Unit weight = y
H.
8'(angle of wall friction) = 0
Figure 11.21
Surcharge q
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