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 17, Problem 17.7P
a.
To determine
Calculate the required thickness of ties
b.
To determine
Find the maximum length of the tie
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A 8-meter-high retaining wall, with a perpendicular back, retains the soil with a unit weight of 17.17 kN/m3. The cohesion and the internal friction angle of the backfill were measured as 13 kPa and 20°, respectively. Assume that there is no friction on the wall and the surface of the backfill is horizontal. Calculate the expected active force on the wall and the position of this force.
In Figure 12.24, which shows a vertical retaining wall with a granular backfill, let H = 4 m, α = 17.5º, γ = 16.5 kN/m3, Φ' = 35º, and ẟ' = 10º. Based on Caquot and Kerisel’s solution, what would be the passive force per meter length of the wall?
(Solve the following exercise, showing and explaining step by step to its resolution). An 8.50 m high retaining wall is built to support a sandy silt with a volumetric weight of 1850 kg/m3 and an angle of internal friction of 28°. The silt also has a cohesion of 1300 kg/m2. The ground surface is horizontal. The effect of the friction of the wall is neglected. Determine the pressure at the base of the screen.
Chapter 17 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- A retaining wall 7 m high, with its back face smooth and vertical. It retains sand with its surface horizontal. Using Rankine’s theory, determine the active earth pressure at the base when the backfill is dry. Take γ=18 kN/m^3 ,ϕ=30°, γ_sat=21 kN/m^3.arrow_forwardPLEASE ANSWER ASAP A 6-m vertical unyielding retaining wall is supporting a cohesionless loose coarse-grained backfill having a unit weight of 16 kN/m3 and an angle of friction of 250. It carries a uniform surcharge of 15 kN/m3. Determine the total lateral force (in kN) per unit length of the wall.arrow_forwardFor a smooth vertical wall supporting a granular backfill with ϕ' = 34°, determine Ka using Eq. (16.22) for α = 0, 5, 10, 15, and 20 degreesarrow_forward
- A 6m vertical retaining wall is supporting a cohesion less horizontal back fill having a unit weight of 16kN/m3 and an angle off riction of 32 degrees. It carries a uniforms urcharge of15kN/m3. a)Determine the at rest lateral force per unit length of wall. b) Determine the Rankines active force per unit length of wall. c)Determine the Rankines passive force per unit length of wall.arrow_forwardA retaining wall 7 m high, with its back face smooth and vertical. It retains sand with its surface horizontal. Using Rankine’s theory, determine the active earth pressure at the base when the backfill is saturated. Take γ=18 kN/m^3 ,ϕ=30°, γ_sat=21 kN/m^3.arrow_forwardA cantilever retaining wall is shown below. Calculate the factors of safety with respect to overturning, sliding, and bearing capacity by using Rankine theory. The friction angle between the soil and the base slab is 18°.arrow_forward
- Determine the total active thrust, in kN/m, for a retaining wall (height 5.12 m.) with horizontal backfill given the following properties: Unit weight = 17.79 kN/m3, Angle of internal friction = 30°, Cohesion = 11.71 kPa, and Surcharge = 9.33 kPa.arrow_forwardA 6-m-high retaining wall is to support a soil with unit weight g=17 kN/m3, soil friction angle f’=24o, and cohesion c’=12 kN/m2. Determine 1) the depth of tensile crack behind the wall, and 2) the depth of excavation behind the wall that requires no support (zero total lateral tress).arrow_forwardA vertical retaining wall 8 m high is supporting a horizontal backfill having a moist unit weight of 17 kN/m3 and a saturated unit weight of 20kN/m3. Angle of internal friction above and below the water table are 30° and 25° respectively with OCR = 2 below the water table. Ground water table is located 3 m below the ground surface. Determine the at rest lateral earth force per meter length of the wall. Determine the location of the resultant force. Determine the at rest lateral earth force per meter length of the wall and location if it carries a surcharge of 100 KPa.arrow_forward
- A frictionless vertical retaining wall has a height of 4 meters and retains a horizontal surcharge of 11 kPa. The unit weight of the backfill is 15 kN/m3 with cohesion of 8 kN/m2 and an angle of friction of 260. Compute the active force (in kN) after the tensile crack.Answer: 26.82arrow_forwardA vertical retaining wall 6 m high is supporting a horizontal backfill having a weight of 16.5 kN/m3 and a saturated unit weight of 19kN/m3. Angle of internal friction of backfill is 30°. Ground water table is located 3m below the ground surface. Determine the at rest lateral earth force per meter length.Determine the location of the resultant force.Determine the at rest lateral earth force per meter length if it carries a surcharge of 50 KPa. INCLUDE FBD.arrow_forward16 Determine the total active thrust, in kN/m, for a retaining wall (height 5.60 m.) with horizontal backfill given the following properties: Unit weight = 17.42 kN/m3, Angle of internal friction = 32°, Cohesion = 11.76 kPa, and Surcharge = 9.32 kPa. Round off to two decimal places.arrow_forward
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