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 17.2P
To determine
Find the factor of safety against overturning, sliding, and bearing capacity failure.
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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.
4) A concrete gravity retaining wall having a unit weight of 150 pcf is shown in the figure.
The Rankine active earth pressure resultant (lb/ft) on the wall is most nearly:
a. 1080
b. 270
C. 1130
d. 1350
GRAVITY WALL
2ft
T41
GRANULAR BACKFILL
>=32°
81 C=0
10°
n=110 pd
sx
Chapter 17 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- Where, X=36 A retaining wall (frictionless) is shown in a) Plot the variation of active and passive lateral pressures with depth for soil profile shown in Fig.1 b) Determine the force due to surcharge in active side c) Compute Total active force on the wall if the wall is 9m long d) Evaluate the lateral stability of the wall by comparing the forces acting on the wallarrow_forward12. A backfill of a retaining wall consists of y=19 kN/m³ which is 6 m high. Find the total earth pressure per meter length. Given coefficient of earth pressure at rest is 0.5. a) 165 kN/m b) 178 kN/m c) 171 kN/m d) 345 kN/marrow_forward15. A backfill of a retaining wall consists of y=19 kN/m³ which is 6 m high. Find the lateral earth pressure per meter length. Given coefficient of earth pressure at rest is 0.5. a) 43 kN/m² b) 57 kN/m² c) 48 kN/m² d) 76 kN/m²arrow_forward
- solve systematicallyarrow_forward1- Figure below shows a retaining wall. Determine the magnitude of the lateral earth force per unit length for the following conditions: 1) At-rest force 2) Active force Also, find the location of the resultant, 7, measured from the bottom of the wall. H (ft) y (lb/ft') 15 19 120 Sand Unit weight = y (or density = p) %3D H c' = 0 8' (angle of wall friction) = 0arrow_forwardCalculate the active and passive earth pressures AND. determine the distance at which the net active and passive force will acting on the retaining wall Ya=19 kN /m3 - 34 c=3kp 2m 6=34 %3D Vd = 17.54kN/m3 8=32"; ċ=o %3D 1.5m %3D = 21. BkN/m3 V sat 8= 31; c'= o %3D 1.5m %3D Ysat = 22.lkN/m3 5 m 8=30;cioarrow_forward
- Problem: The cantilever retaining wall shown in the figure resists active lateral earth pressure throughout its length. 1. Calculate the total lateral force on the wall due to active pressure in KN2. Determine the overturning moment due to lateral earth pressure in KN-m.3. Determine the resisting overturning moment in KN-marrow_forwardPlease only solve 12.15 PLEASE EXPLAIN TO ME HOW TO FIND THE LOCATION OF THE RESULTANT, I don't know how to take the moment about the buttom for each area, please explain, thank youarrow_forward13.2 Assume that the retaining wall shown in Figure 13.9 is frictionless. Determine the Rankine active force per unit length of the wall, the variation of active earth pressure with depth, and the location of the resultant. If H = 4m, Ø = 36° and y = 18 kN/m3 kN Ans. P, = 37.44", z = 1.33m m 13.3 Assume that the retaining wall shown in Figure 13.9 is frictionless. Determine the Rankine passive force per unit length of the wall, the variation of lateral earth pressure with depth, and the location of the resultant. If H = 5m, Ø = 35° and y = 14 kN/m? Ans. Pp 645.8 kN z = 1.67m m. Sand Unit weight = y (or density = p) %3D H c' = 0 8' (angle of wall friction) = 0 Figure 13.9arrow_forward
- A retaining wall supports a horizontal backfill that is composed of two types of soil. The first layer is 4.47m high. It has a unit weight of 16.92kN/m3. The second layer is 5.76m and has a unit weight of18.51 kn/m3. If the angle of friction for both layers is 38 degrees, determine the total active force (kN) acting on the retaining wall per unit. Use stored value. Asnwer on 5 decimal places.arrow_forward12.2 ), Figure P12.2, and the following values to determine the at-rest lat- eral earth force per unit length of the wall. Also find the location of the resultant. H = 5 m, H1 = 2 m, H, = 3 m, y = 15.5 kN/m², yt = 18.5 kN/m², 4' = 34°, c' = 0, q = 20 kN/m², . Repeat problem when water level Groundwater at ground surface. Figure P12.2arrow_forwardA retaining wall is constructed in a clayey soil. The height of the backfill is found to be 9m, the unit weight of the sand is 2t/m³ and the angle of internal friction is 30°. Find out the earth pressure per meter length on the retaining wall with a smooth vertical back.arrow_forward
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