16N, 6 = 7. For a vertical retaining wall 5 m high with level backfill and the properties y = 32°, & = 10°, ky = 0.15, kh = 0.25, determine the active earth pressure force Pae during an earthquake using Mononobe-Okabe theory: 8. For the wall in the previous problem, determine the passive earth pressure force from Coulomb and log-spiral theory.

16N, 6 = 7. For a vertical retaining wall 5 m high with level backfill and the properties y = 32°, & = 10°, ky = 0.15, kh = 0.25, determine the active earth pressure force Pae during an earthquake using Mononobe-Okabe theory: 8. For the wall in the previous problem, determine the passive earth pressure force from Coulomb and log-spiral theory.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter13: Lateral Earth Pressure: At-rest, Rankine, And Coulomb

Section: Chapter Questions

Problem 13.21P

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1. Determine the lateral force Pae for a proposed retaining wall 6 m high for a horizontal backfill and whose uniform weight is 16 KN/cu m. The back of wall is inclined 5° w.r.t. the vertical. Consider 8 = 15°, kv = 0 and kh = 0.10. Locate the position, z, of Pae above the base. Use Coulomb's active earth pressure coefficient to determine Pa. Refer to the formulas in lesson Module 8. [Additional data: angle of internal friction Ø=30°]
A vertical wall 6 m high above the water table, retains a 20° soil slope, the retained soil has a unit weight of 18 kN/m³, the appropriate shear strength parameters are C = 0 and + = 40°. The coefficient of active earth pressure to be used in estimating the active pressure acting on the wall is
Problem 3: A vertical retaining wall 6 m high is supporting a horizontal backfill having a weight 16.5 kN/m and a saturated unit weight of 19 kN/m?. Angle of trictian of the backfill is 30. Ground water table is located 3 m below the ground surface. 1. Determine the at rest lateral earth force per meter length of the wall. 3.0 m 2. Determine the location of the resultant force. 3. Determine the at rest lateral earth force per meter length af the wall if it carries a surcharge of 50 kPa. 3.0 m
A rigid retaining wall 5 m high supports a backfll of cohesionless soil with = 30°. The water t is below the base of the wall. The backfill is dry and has a unit weight of 18 kN/m². Deter Rankine's passive earth pressure per meter length of the wall (Fig. Ex. 11.5).
U The soil conditions adjacent to a rigid frictionless retaining wall are shown in the figure below. A surcharge pressure of 50 kN/m² is applied on the surface of the backfill. For Soil A above the water table, c' = 20 kN/m², '= 28°, y = 18 kN/m³ For Soil B below the water table, c' = 0, ' = 38°, y = 20 kN/m³ Calculate the maximum Rankine active earth pressure behind the wall and the resultant active force per unit length of the wall. Also determine the location of the resultant force. q = 50 kN/m² ↓↓↓↓ 后 Soil A Soil B 4 6 m 3 m GWT 12:04 PM
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.
13.2 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 13.9
1. Avertical-backed retaining wall is 8 m high and supports a cohesionless soil of volumetric weight of 1.75 ton/m3 and = 30°. The ground surface is horizontal. find the magnitude and direction of the thrust per meter of wall, using Rankine's Theory. a) By means of pressure diagram. b) Using the formula proposed by Rankine. Y = 1.75 ton/m3 C = 0 ton/m2 = 30° 18.0 m
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Question 2 For the gravity retaining wall (concrete) shown in figure below; if the angle B has changed to be 80°, Ø1= 29°; and a = 5° use Coulomb's theory to calculate the horizontal and vertical components of the active earth pressure. %! Y-18.5 kN/m :-32 5.7 m 5m 283 m P. 75 2.167 m 1.5 m 1.53 m 0.8 m 0.22 m - 18 KN/m 0.3 m 0,8 m :-24 3.5 m 30 KN/m?
SITUATION 2: A retaining wall 6 m high supports cohesionless soil having a dry density of 1600 kg/m?,angle of resistance 32° and void ratio of 0.68. The surface of the soil is horizontal and level with the top of the wall. Neglecting wall friction and using Rankine's formula for active pressure of a cohesionless soil. 6. Determine the nearest value of the total earth thrust on the wall in KN per lineal meter if the soil is dry. а. 73.1 c. 62.4 b. 86.7 d. 98.1 7. Find the nearest value of the thrust on the wall in KN per lineal meter if owing to inadequate drainage, it is waterlogged to a level of 3.5 m below the surface. а. 112 c. 147 b. 171 d. 153 8. Find at what height above the base of the wall the thrust acts during the waterlogged condition. а. 2.21 m c. 1.74 m b. 2.00 m d. 1.42 m