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. Sand 1 2 m y = 17.5 kN/m³; ' = 32° 3 m Sand 2 y = 17.5 kN/m3; ' = 36°

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. Sand 1 2 m y = 17.5 kN/m³; ' = 32° 3 m Sand 2 y = 17.5 kN/m3; ' = 36°

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 16.5P

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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°
It was found that the backfill against a retaining wall (6 meters in height as shown in Figure 3) has specify weight y= 16 kN/m³ when its water content w= 5 %, S = 0.12, its internal friction angle was measured as 30° (take G,= 2.7 and xw = 10 kN/m³). a. Predict distribution of lateral stress on this retaining wall along its depth in its “at rest" state, and its resultant force. b. Rain leads the backfill water content increase to 10% in its upper half, and saturated in its lower half, find and plot its lateral stress and pore pressures along its depth in an active state.
A 5 m high retaining wall is supporting the soil having properties as shown below: 5m $ = 30° c = 10 kN/m² Y=17.5 kN/m 3 The Rankine active earth pressure (per meter length) on the wall after the formation of tensile crack is
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 2
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
Calculate the total active force acting on a vertical wall 5m high retaining a sand of unit weight 17 kN/m3 for which O'=35°. The surface of the sand is horizontal and the water table is 2 m 2m 5m below the sand surface, the saturated unit weight of the sand is 20 kN/m³. Also y = 17 kN/m³ determine the location of the resultant o' = 35° active force. Ysat = 20 kN/m³
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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 Yw
Q1 A hydraulic structures shown in fig. determine 1- the uplift pressures corrected at key points by Khosla's theory? 2- check the thickness at point A ? F.S.L = 32.5 29.5 28.7 27 A 25.5 20.7 18.2 7m 15m 10m
For the frictionless wall retaining a stratified soil and shown in Fig. E3.2, determine: (a) The active lateral earth pressure distribution with depth. (b) The passive lateral earth pressure distribution with depth. (c) The magnitude and location of the active and passive forces. (d) The resultant force. (e) The ratio of passive moment to active moment. 4,- 20 kPa =250 %3D Ysen=20 kN/m =300 HAm
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