A

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter16: Lateral Earth Pressure

Section: Chapter Questions

Problem 16.19P

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Question

A retaining wall supports a horizontal backfill that is composed of two types of soil. The first layer is 4.79 meters high. It has a unit weight of 16.61 kN/m3. The second layer is 6.58 meters and has a unit weight of 18.72 kN/m3. If the angle of friction for both layers is 34°, determine the total active force (kN) acting on the retaining wall per unit width. Final answer should be in two decimal places.

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A braced wall is shown in Figure 14.20. Given: H = 7 m, naH = 2.8 m, =30, =20, = 18 kN/m3, and c = 0. Determine the active thrust, Pa, on the wall using the general wedge theory. Figure 14.20
A 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 m
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A vertical retaining wall 6 m. high retains a soil having the following properties. Unit weight of cohesionless soil = 19.2 kN/m3, angle of internal friction = 30°. The ground surface behind the wall is inclined at a slope of 3 horizontal and 1 vertical and the wall has moved sufficiently to developthe active condition.• Compute the Rankine’s coefficient of active earth pressure.• Compute the normal force acting on the back of the wall using Rankine’s theory.• Compute the vertical component of the force acting on the back of the wall using Rankine’s Theory.
SOLVE FOR THE LOCATION AND MAGNITUDE OF THE PASSIVE AND ACTIVE THRUST OF THE RETAINING WALL. Along the passive side, the soil has the following properties: unit weight: 16 kN/m3, cohesion = 30 KPa, angle of internal friction = 25 degrees. and along the active side: sand: unit weight = 15 KN/m3, angle of internal friction = 30 degrees, and for clay: dry unit weight = 16.5 KN/m3, saturated unit weight = 19 kn/m3 , unconfined compressive strength = 48 KPa, angle of inter friction is 25 degrees. The height