For Questions A and B a temporary earth support wall is supporting a 25 ft excavation. A. Neatly draw the active soil pressure diagram, based on Rankine Theory, behind the wall and show the maximum pressure at the bottom of the temporary wall after completion of the excavation. Also indicate the location of the theoretical slip (failure) plane and its angle from the vertical. The soil is a saturated clay with properties as follows: gsat = 132 pcf, f = 19o c = 450 psf B. Use table 5.5 in the textbook and repeat problem 2 for a medium-dense gravely-sand with the following properties shown on the table: gin-situ = 120 pcf, f = 34o c = 0 psf
For Questions A and B a temporary earth support wall is supporting a 25 ft excavation.
A. Neatly draw the active soil pressure diagram, based on Rankine Theory, behind the wall and show the maximum pressure at the bottom of the temporary wall after completion of the excavation. Also indicate the location of the theoretical slip (failure) plane and its angle from the vertical. The soil is a saturated clay with properties as follows:
gsat = 132 pcf, f = 19o c = 450 psf
B. Use table 5.5 in the textbook and repeat problem 2 for a medium-dense gravely-sand with the following properties shown on the table:
gin-situ = 120 pcf, f = 34o c = 0 psf
![TABLE 5.5 Simplified Typical Soil Values
+ Friction
Angle of
y Soil
Unit Weight
(pcf)
Density
K Coefficient
Soil
or
of Active Earth
Classification
the Soil
Consistency
Pressure
Gravel,
41
Dense
130
0.21
gravel-sand
34
Medium dense
120
0.28
mixture,
29
Loose
90
0.35
coarse sand
Medium sand
36
Dense
117
0.26
31
Medium dense
110
0.32
27
Loose
90
0.38
Fine sand
31
Dense
117
0.32
27
Medium dense
100
0.38
25
Loose
85
0.41
Fine silty sand,
sandy silt
29
Dense
117
0.35
27
Medium dense
100
0.38
25
Loose
85
0.41
Silt
27
Dense
120
0.38
25
Medium dense
110
0.41
23
Loose
85
0.44](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa1760080-1cda-4e9f-9e45-e6b79c8a33a2%2Fcffc85e9-cc47-4d64-9b60-45d10d7695a6%2Fyookaau_processed.png&w=3840&q=75)
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Given:
Height of temporary Wall (H)= 25ft
Case 1: gsat = 132 pcf, f = 19o c = 450 psf
Case 2: gin-situ = 120 pcf, f = 34o c = 0 psf
To Find:Maximum pressure at the bottom of the temporary wall after completion of excavation.
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