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 16.7P
To determine
Find the magnitude and location of the active thrust on the wall.
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1. Refer to Figure below For H = 6 m, y = 17.0 kN/m³,
o' = 36°, c' = 0, ß = 85°, a = 10°, and 8' = 24°, assume
that the backfill is in the active state and use Coulomb’s
equation to determine the magnitude, location, and direction
Pa
of the active thrust on the wall.
H
2. what would be the active thrust Pa
there is a surcharge of 25 kN/m² at the ground level?
when
16.7 Determine the magnitude and the location of the active
thrust on the smooth vertical wall shown in Figure P16.7,
assuming that the entire backfill is in the active state.
FIGURE P16.7
4.0 m
3.0 m
Sand
y = 16.5 kN/m³; ¢' = 34°
Silty sand
y = 16.5 kN/m³; ¢' = 36°
16.5 The backfill retained by a gravity retaining wall shown in
Figure P16.5 consists of two sand layers, compacted at dif-
ferent densities. The properties of the sand are shown in the
figure. Assuming that the gravity wall does not move later-
ally (i.e., at-rest), determine the magnitude and location of
the thrust on the wall.
FIGURE P16.5
2 m
3 m
Sand 1
y = 17.5 kN/m³; ' = 32°
Sand 2
y = 17.5 kN/m³; ' = 36°
Chapter 16 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- 5. Determine the magnitude and the location of the active thrust on the smooth vertical wall shown in Figure 2 below, assuming that the entire backfill is in the active state. 4.0 m Sand y= 16.5 kN/m; d' = 34° Silty sand y- 165 kN/m": d' = 36° 3.0 m Figure 2arrow_forwardThe channel section shown in Figure P9.65 is subjected to a vertical shear force of V = 7 kips. Calculate the horizontal shear stress TA at point A, and the vertical shear stress TB at point B. 2 in. 0.25 in. B 3 in. 0.20 in. -0.20 in. 8 in. FIGURE P9.65arrow_forwardThe backfill behind a retaining wall, located above the water table, consists of a sand of unit weight 19 kN/m³. The height of the wall is 8 m and the surface of the backfill is horizontal. Determine the total active thrust on the wall according to the Rankine theory if c'=0 and q'=38. If the wall is prevented from yielding, what is the approximate value of the thrust on the wall?arrow_forward
- Q2. Which of the two retaining walls in Figure 2 produces a larger horizontal component of active thrust? y = 18 kN/m³ $'= 34° c' = 0 kPa 14 H=7m H = 7m Figure 2 115°arrow_forwardQ.6 A rigid retaining wall 19.69 ft high has a saturated backfill of soft clay soil. The properties of the clay soil are ϒsat = 111.76 lb/ft3 , and unit cohesion cu = 376 lb/ft2 . Determine (a) the expected depth of the tensile crack in the soil (b) the active earth pressure before the occurrence of the tensile crack, (c) the active pressure after the occurrence of the tensile crack. I need solution of part c onlyarrow_forwardA retaining vertical wall 5 m high is retaining a sand of unit weight 17 kN/m3 for which o = 35°, the surface of sand is horizontal and the water table is below the bottom of wall. The saturated unit weight of sand is 20 kN/m3. The percentage change in the active thrust on wall if water table rises to ground level isarrow_forward
- Q.6 A rigid retaining wall 19.69 ft high has a saturated backfill of soft clay soil. The properties of the clay soil are ϒsat = 111.76 lb/ft3 , and unit cohesion cu = 376 lb/ft2 . Determine (a) the expected depth of the tensile crack in the soilarrow_forward9.48 Water flows past a triangular flat plate oriented parallel to the free stream as shown in Fig. P9.48. Integrate the wall shear stress over the plate to determine the friction drag on one side of the plate. Assume laminar boundary layer flow. U = 0.2 m/s 1.0 m 45arrow_forwardThe backfill behind a retaining wall, located above the water table, consists of a sand of unit weight 17 kN/m3. The height of the wall is 6 m and the surface of the backfill is horizontal. Determine the total active thrust on the wall according to Rankine’s theory if f’ = 37o. If the wall is prevented from yielding, what is the approximate value of the thrust on the wall?arrow_forward
- Prob. 4 13.17 Figure 13.10 shows a frictionless wall with a sloping granular backfill. Given: H = 4 m, a = 10°, ø' = 33°, and y = 19 kN/m³. a. Determine the magnitude of active pressure, o, at the bottom of the wall. Also, state the direction of application of o. b. Determine the Rankine active force, Pas per unit length of the wall and its location and direction. H oa Frictionless wall Figure 13.10 Frictionless vertical retaining wall with sloping backfill © Cengage Learningarrow_forwardA retaining wall of height 10 m with clay backfill is shown in the figure (not to scale). Weight of the retaining wall is 5000 kN per m acting at 3.3 m from the toe of the retaining wall. The interface friction ER angle between base of the retaining wall and the base soil is 20. The depth of clay in front of the retaining wall is 2.0 m. The properties of the clay backfill and the clay placed in front of the retaining wall are the same. Assume that the tension crack is filled with water. Use Rankine's earth pressure theory. Take unit weight of water, Y = 9.81 kN/m³ Ywarrow_forwardDetermine the magnitude and the location of the active thrust on the smooth vertical wall shown assuming that the entire backfill is in the active state.arrow_forward
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