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 16.13P
To determine
Find the active thrust.
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7.17 A soil profile consists of a clay layer underlain by a sand
layer, as shown in Figure P7.17. If a tube is inserted into
the bottom sand layer and the water level rises to 1 m
above the ground surface, determine the vertical effec-
tive stresses and porewater pressures at A, B, and C. If
K, is 0.5, determine the lateral effective and lateral total
stresses at A, B, and C. What is the value of the pore-
water pressure at A to cause the vertical effective stress
there to be zero?
GWL
11 m Y=18.5 kN/m?
Clay
2 m Y= 19.0 kN/m³
2: 1,5m Y =17.0 kN/m
Sand
2 m
FIGURE P7.17
Determine the active lateral earth pressure on the frictionless wall shown in the figure below.
Sketch the lateral earth pressure distributions and calculate the resultant force and its location
from the base of the wall. Also, determine the moments of passive and active forces. Neglect
seepage effects. Use Rankine's earth pressure method. (w = 10 kN/m)
3.0m
Ysat
20 kN/m³
y = 19 kN/m²³
' = 30°
Ysat
=
20 kN/m³
y = 18 kN/m³
o = 28
6.0m
7.17 A soil profile consists of a clay layer underlain by a sand
layer, as shown in Figure P7.17 If a tube is inserted into
the bottom sand layer and the water level rises to 1 m
above the ground surface, determine the vertical effec-
tive stresses and porewater pressures at A, B, and C. If
K, is 0.5, determine the lateral effective and lateral total
stresses at A, B, and C. What is the value of the pore-
water pressure at A to cause the vertical effective stress
there to be zero?
GWL
|1 m Y- 18.5 kN/m
Clay
2m Yu- 19.0 kN/m
1.5 m Yur=17.0 kN/m
Sand
2m
E
Chapter 16 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- A 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_forward1. 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? whenarrow_forwardThe figure consists of four forces, F1 = 85 kN, F2 = 55 kN, F4 =40 KN, a=55° and B=40° if the resultant is 60 kN directed downward to right at an angle of 55° from the harizontal, determine the magnitude and direction of F3arrow_forward
- Figure P.2.2 P.2.3. A truncated conical bar was subjected to an axial load P as in Figure P.2.3. Compute the total elongation 8 of the bar if P = 200 kN, rị = 10 mm, r2 = 30 mm, l = 1 m and E = 2.0 × 10' MPa. Ans. 8 = 1.06 mm. P= 200 kN P Figure P.2.3arrow_forward16.7 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°arrow_forwardA retaining wall 8 m high supports a cohesionless soil having a dry density of 1600 kg/m^3, angle of shearing resistance is 33 degrees and void ratio of 0.68. The surface of the soil is horizontal and level with top of the wall. Neglect wall friction and use Rankine’s formula for active pressure of a cohesionless soil. Determine the value of earth thrust on the wall per meter length if the soil is dry. a. 121 kN b. 186 kN c. 148 kN d. 137 kN determine the value of earth thrust on the wall if water level is 3.5 m below the surface. a. 230 kN b. 250 kN c. 180 kN d. 210 kN find the height above the base of the wall where the thrust acts during the water logged condition. a. 3.50 m b. 2.67 m c. 1.75 m d. 2.25 marrow_forward
- 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_forwardQ 11.7arrow_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
- 3. From the figure shown below, the hydrostatic uplift varies linearly from one-half the hydrostatic head at the upstream edge of the dam to zero at the downstream edge. Determine the following: a. Vertical reaction of the dam b. Is the dam safe against overturning c. Is the dam safe against sliding. Use coefficient of friction=0.57 d. Maximum and minimum soil pressure 3 m 4.50m 30m 27 m F 18 marrow_forwardbbarrow_forwardB A V = 130 kN 50 mm 150 mm 150 mm 150 mm 50 mm 150 mm www - Change the magnitude of the internal shear force from 130 kN to 90.2 kN Plot the intensity of the shear stress distribution acting over the cross-sectional area, and determine the resultant shear force developed in the vertical segment AB.arrow_forward
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