SITUATION. A wooden plank is used as a retaining wall for a 2.5m height of soil, considering a fixed bottom support It has the following properties: Dimension: 400mm x 80mm thick Allowable stress in shear = 0.8 MPa Active earth pressure coefficient Ka 1/3 Allowable stress in bending = 12 MPa Unit weight of soil= 18 kNim3 Q Zoom image Which of the following gives the maximum flexural stress in the plank? 14.65 MPa 12.6 MPa 13.5 MPa O 36.6 MPa Determine the safe thickness of the plank. 36mm 80mm 90mm O 25mm

SITUATION. A wooden plank is used as a retaining wall for a 2.5m height of soil, considering a fixed bottom support It has the following properties: Dimension: 400mm x 80mm thick Allowable stress in shear = 0.8 MPa Active earth pressure coefficient Ka 1/3 Allowable stress in bending = 12 MPa Unit weight of soil= 18 kNim3 Q Zoom image Which of the following gives the maximum flexural stress in the plank? 14.65 MPa 12.6 MPa 13.5 MPa O 36.6 MPa Determine the safe thickness of the plank. 36mm 80mm 90mm O 25mm

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter17: Retaining Walls

Section: Chapter Questions

Problem 17.1P

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A 6m retaining wall is supporting a soil with the following properties:Unit weight = 16 KN/cu.mAngle of internal friction = 25ºCohesion = 14 Kpaa. Assuming no tensile cracks occurs in the soil; determine its normal pressure acting at the back of the wall.b. If tensile crack occurs in the soil, calculate its active pressure acting on the wall.c. Find the location of tensile crack measured from the surface of horizontal backfill.
Calculate the stress in Mpa at the top and bottom experienced by the beam shown in the fixed end if the initial prestress force is 800 kN with 15% losses.
1. A RETAINING WALL HAS A HEIGHT OF 6M. AND IS SUPPORTED A HORIZONTAL BACKFILL WHICH IS LEVEL WITH THE TOP OF THE WALL. THE BACKFILL HAS A UNIT WEIGHT OF 16 KN/m3 A. COMPUTE THE LATERAL FORCE PER UNIT LENGTH OF THE WALL IF THE WALL IS PREVENTED FROM MOVING. USE POISSONS RATIO OF SOIL TABLE TO BE 0.36B. IF THE ANGLE OF FRICTION OF THE SOIL IS 32 DEGREES, FIND THE LATERAL ACTIVE FORCE ACTING ON THE WALL. 2. LL = 65%PL = 25%WATER CONTENT = 35%SPECIFIC GRAVITY OF SOLIDS= 2.70DEGREE OF SATURATION = 100 % A. DETERMINE THE VOID RATIO OF THE SOIL SAMPLEB. DETERMINE THE BULK DENSITY OF THE SOIL SAMPLE
A retaining wall supports a horizontal backfill that is composed of two types of soil. The first layer is 4.47m high. It has a unit weight of 16.92kN/m3. The second layer is 5.76m and has a unit weight of18.51 kn/m3. If the angle of friction for both layers is 38 degrees, determine the total active force (kN) acting on the retaining wall per unit. Use stored value. Asnwer on 5 decimal places.
Q.6 A rigid retaining wall 19.69 ft high has a saturated backfill of soft clay soil. The properties of the clay soil are ϒsat = 111.76 lb/ft3 , and unit cohesion cu = 376 lb/ft2 . Determine (a) the expected depth of the tensile crack in the soil (b) the active earth pressure before the occurrence of the tensile crack, (c) the active pressure after the occurrence of the tensile crack. I need solution of part c only
A long braced cut shown is supporting a layer of clay. Angle of fraction is 0. The struts are placed 3m center to center. a.) Determine the reaction of the strut at B. b.) Determine the section modulus of wale at B if the allowable bending stress is 0.6Fy where Fy = 250Mpa
A retaining wall 6 m high is supporting a horizontal backfill of soil having a void ratio of 0.5 and specific gravity of 2.7. The angle of internal friction is 32°.Compute the rankine active force on the wall if there is no water.Compute the rankine active force on the wall if the water table is on top of the horizontal backfill level.Compute the rankine active force on the wall if the water table is at the bottom of the wall and the water content is 10%.
A short rectangular post supports a compressive load of P = 175 kN as shown. A top view of the post showing the location where load P is applied to the top of the post is also shown. Determine the vertical normal stress at corner d of the post.
Q2:Find the thickness of a capillary zone of a silty clay soil layer above water table where the pore water pressure was 100 kN/m² and the tension force of the soil was 0.001 kN at adhesion angle is 8º.
A retaining wall 6 m high supports cohesionless soil having a dry density of 1600 kg/m³, 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. 1. Determine the nearest value of the total earth thrust on the wall in KN per lineal meter if the soil is dry. a. 73.1 b. 86.7 c. 62.4 d. 98.1 2. 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. a. 112 b. 171 c. 147 d. 153 3. Find at what height above the base of the wall the thrust acts during the waterlogged condition. a. 2.21 m b. 2.00 m c. 1.74 m d. 1.42 m
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