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 16.2P
To determine
Find the magnitude and location of the thrust on the wall.
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Determine the stability of the cantilever gravity retaining wall shown in figure below.
The existing soil is a clay and the backfill is a coarse-grained soil. The base of the wall
will rest on a 50-mm-thick, compacted layer of the backfill. The interface friction between
the base and the compacted layer of backfill is 25.0°. Groundwater level is 8 m below the
base.
1.0 m
Batter
1:20
0.4 m
1.8 m
9, = 20 kPa
8⁰
Ysat = 18 kN/m³
cs = 25°
8 = 15⁰
Backfill
Drainage blanket
Y = 23.5 kN/m³
3 m
Existing
soil
6.1 m
0.9 mi
Ysat = 19 kN/m³
= 35°
% = 25°
Question Attached
A cantilever retaining wall supports 2 layers of soil and surcharge as shown below. The layers have these properties:
Layer 1: 1.8m thick. γ = 17.4 kN/m3 and ϕ = 22 degrees
Layer 2: 4.2m thick. γsat = 18.1 kN/m3 and ϕ = 30 degrees
The angle of friction between the base and soil is 42 degrees. Unit weight of concrete is 23.6 kN/m3
What is the design moment (kNm / m) at the bottom of the stem?
None of the choices
819.98
478.88
363.00
299.30
Please answer this asap. For upvote. Thank you very much
Chapter 16 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- Soonarrow_forwardAssume a smooth retaining wall as shown below. Calculate the hydrostatic force acting on the right side of the wall in kN per unit length (considering a 1 m length in the out-of-plane direction). The soil properties shown in the figure apply to either side of the wall g = 9.81m/s2arrow_forwardAssume a smooth retaining wall as shown below. Calculate the active force due to the earth pressure only acting on the right side of the wall in kN per unit length (considering a 1 m length in the out-of-plane direction). The soil properties shown in the figure apply to either side of the wall g = 9.81m/s2arrow_forward
- For a smooth vertical wall retaining a granular backfill inclined at an angle of a = 15 ° , check whether Eqs . ( 16.70 ) and (16.72 ) ( or Tables 16.9 and 16.10 ) give the same values for the passive earth pressure coefficient . Use Ø' = 30° and 40°.arrow_forwardQ1/ In Fig. 1 a retaining wall has a vertical back and is 8 m high. Determine the magnitude and the location the resultant of active force per unit meter with plot the diagram of active earth pressure. Neglecting the effect of wall friction. plot the diagram of active earth pressure Surcharge 30 kN/m2 Sand Y = 17 kN/m2 $ = 30° 3 m W.T. Sand 7= 20 k/m2 5 m $ = 35°arrow_forwardA retaining wall supports a horizontal backfill that is composed of two types of soil. First layer: 4.84 meters high, Unit weight of 17.36 kN/m3, coefficient of active pressure of 0.285 Second layer: 5.68 meters high, Unit weight of 18.9 kN/m3, coefficient of active pressure of 0.307 Determine the distance of the total active force measured from the bottom of the wall. Round off to three decimal places.arrow_forward
- Only in 5 minutesarrow_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_forwardA smooth unyielding wall retains a normally consolidated clay with no lateral movement of soil, that is at rest condition is assumed. a) Compute the coefficient of earth pressure at rest if the clay has a plasticity index of 7.8%. (Answer: 0.455) b) Compute the location of the resultant force. (Answer: 19.81 kN) c) Compute the total lateral force acting on the wall. (Answer: 1.20)arrow_forward
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