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 16, Problem 16.15P
To determine
Calculate the magnitude and location of the resultant load on the wall
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H.W. 2: What is the total active force/unit width of wall and what is the location of the
resultant for the system shown in Fig.? Use the Coulomb equations and take a smooth
wall so S=0°
7.0 m
9-100APX
= 37
-16.5 EN³
=V
7-19.25
Sol L
Sall 1
T
30.3 kPa
107.3 KN
131 EN
$2.5
183.8
R=40.5LN
EN
LOMI
17.3 18
Refer to Figure 12.13a. Given H = 4 m, α = 0, β = 85º, γ = 17 kN/m3, c' = 0, Φ' = 36º, ẟ'/Φ' = 0.5, and q = 30 kN/m2. Determine the Coulomb’s active force per unit length of the wall.
2- Figure below shows a retaining wall that is restrained from yielding. Determine the magnitude of the lateral earth
force per unit length for the following conditions:
1) At-rest force
2) Passive force
Also, find the location of the resultant, 7, measured from the bottom of the wall.
H (ft)
H1 (ft)
71 (lb/fr)
72 (lb/ft³)
p'ı
q (lb/fr²)
10
5
90
122.4
34
26
100
Surcharge = q
Sand
c{ = 0
Groundwater table
H
Sand
Y2 (saturated unit weight)
có = 0
Frictionless wall
Chapter 16 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- 13.22 Consider the retaining wall shown in Figure 13.38. The height of the wall is 9.75m. and the unit weight of the sand backfill is 18.7kN/m3. Using Coulomb's equation, calculate the active force, Pa, on the wall for the following values of the angle of wall friction. Also, comment on the direction and location of the resultant.arrow_forwardYou are working for a consulting firm that has been asked to evaluate the factor of safety of the wall shown in the figure supported by a well-degraded sand. The resultant load behind the concrete wall acts at the one third point. Dw 1m 1.5 m 24 kN/m³ y = 20 kN/m³ 26.5 kN/m 24° = 34° n = 0.4 3 m (a) Determine the factor of safety if Dw − D > 1.5B. Ignore the lateral passive resistance due to the soil in front of the wall. (b) Determine the factor of safety if the ground water table rises to 0.5 m below the base of the wall. Discuss the significance of your observations.arrow_forwardQ5: In the case of the retaining wall depicted below. Calculate the lateral earth fore at rest per unit length of the wall. Determine the location of the resulting force as well as its magnitude. [25] y = 16.5 kN/m $ = 30 C = 0 Ground v Water table 2.5m Yur = 19.3 kN/m 0 = 30 C = 0 2.5m Good Luckarrow_forward
- A 3.1 m high vertical retaining wall is shown. a. What is the effective vertical stress acting at the base of the wall? b. What is the total active force acting on the wall? c. What is the total active moment on the wall? Please answer this asap. For upvote. Thank you very mucharrow_forwardA retaining wall 6 m high is supporting a horizontal backfill of soil having a void ratio of 0.5 and specific gravity of 2.7. The angle of internal friction is 32°. Compute the rankine active force on the wall if there is no water. [ Select] Compute the rankine active force on the wall if the water table is on top of the horizontal backfill level. [Select J Compute the rankine active force on the wall if the water table is at the bottom of the wall and the water content is 10%. I Selectarrow_forwardConsider the wall shown below. Dimensions are in meters. sand O' = 30 0.5 0.5 > 1 K Determine the active force acting on the wall. Circle your answer. b. а. Determine the FS for sliding. Circle your answer. Determine the FS for overturning. Circle your answer. d. Determine the FS for overturning if a row of tiebacks is placed 2 meters below the backfill's ground surface. Tieback spacing is 2 meters. The capacity of each tieback is 50 kN. Circle your answer. C.arrow_forward
- A retaining wall is shown in Figure 14.23. Determine Rankine’s active force, Pa, per unit length of the wall and the location of the resultant in each of the following cases:arrow_forward- For the flexible wall shown in Figure 2, determine the resultant lateral force on the wall (magnitude and location) using Rankine's method Eigure 2. q = 120 psf G.S. y= 115 pcf 4 ft = 30° W.T. 5ft - 90arrow_forward8. The rectangular gate in the figure is hinged at the upper edge and is 4 ft. wide. Calculate the total force on the sill neglecting the weight of the gate. 10' Water Hinge Sill 45°arrow_forward
- Extra Question: If the Dead load in the slab shown is 24 KN/m^3, determine the end support reaction at beam BE. A E B S1 (200 mm) 1.5 m Option 1 a) 16.1 KN Ob) 17.1 KN Oc) 18.1 KN Od) 19.1 KN S2 (150 mm thick) 4.0 m S1 (200 mm) 1.5 m > 4.5marrow_forwardb. Lateral pressure due to soil (in kN/m2 per meter length of wall): @ point R = @ just above point S = @ just below point S = @ point T = Thank youarrow_forward3. Compute the resultant lateral force for the soil-wall system shown in Figure 3. You may ignore tensile cracks. Use • A- Coloumb • B - Rankine 0=30°, y=20kN/m³ 4m Ground water table 7m c=50KN/m², p=10°, y=18KN/m³ 0=25°, y=20KN/m³ 8 m Gravity wall Figure 3arrow_forward
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