Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 15, Problem 15.14P
To determine
Find the vertical spacing
Find the length (L) of each layer of geotextile.
Find the lap length
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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 submerged with water table at the surface. Take γ=18 kN/m^3 ,ϕ=30°, γ_sat=21 kN/m^3.
A 4.5 m high retaining wall is restrained from yielding. The wall supporting a horizontal overconsolidated soil having a unit weight of 17.4 KN/m3 with an angle of friction of 30°. Groundwater table is located 3 meters below the ground surface. Saturated unit weight of soil is 18.2 KN/m3. The soil has an overconsolidation ratio of 2.
Compute the coefficient of earth pressure at rest.
Compute the lateral force per unit length of wall
Determine the location of the resultant force from the bottom of the wall.
A retaining wall 6m. high is to support a horizontal backfill. The upper 3m. of backfill has a unit weight of 16kN/m3, angle of friction of 30 degree. Water table is located 3m. below the ground surface and the saturated unit weight of the soil below the water tale is 19kN/m3 with an angle of friction of 36 degree. It carries a uniform surcharge of 25 kN/m2.
1. Compute the Rankine active force per unit length of the wall assuming that the wall can yeild sufficientlyto develop active state.
2. Compute the location of the resultant line of action from the bottom of the wall.
3. Compute the moment due to the resultant active force.
Chapter 15 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 15 - Prob. 15.1PCh. 15 - Prob. 15.2PCh. 15 - Prob. 15.3PCh. 15 - Prob. 15.4PCh. 15 - Prob. 15.5PCh. 15 - Prob. 15.6PCh. 15 - Prob. 15.7PCh. 15 - Prob. 15.8PCh. 15 - Prob. 15.9PCh. 15 - Prob. 15.10P
Ch. 15 - Prob. 15.11PCh. 15 - Prob. 15.12PCh. 15 - Prob. 15.13PCh. 15 - Prob. 15.14PCh. 15 - Prob. 15.15PCh. 15 - Refer to the braced cut in Figure 15.50, for which...Ch. 15 - For the braced cut described in Problem 15.16,...Ch. 15 - Refer to Figure 15.51 in which = 17.5 kN/m3, c =...Ch. 15 - Refer to Figure 15.27a. For the braced cut, H = 6...Ch. 15 - Prob. 15.20PCh. 15 - Determine the factor of safety against bottom...Ch. 15 - Prob. 15.22PCh. 15 - The water table at a site is at 5 m below the...Ch. 15 - Prob. 15.24PCh. 15 - Prob. 15.25CTPCh. 15 - Figure 15.53 below shows a cantilever sheet pile...
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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_forwardA 5-m tall cantilever retaining wall retains soil having the following properties: Cohesion, c = 0 Unit weight, 19.8 kN/m3 Angle of internal friction, ϕ = 31⁰ The ground surface behind the wall is inclined at a slope of 3 horizontal to 1.6 vertical, and the wall has moved sufficiently to develop the active condition. Use Rankine’s Theory and consider 1 m length of wall. a. Determine the coefficient of active pressure b. Determine the total active force c. Determine the overturning moment on the wall Please answer this asap. For upvote. Thank you very mucharrow_forwardA 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_forward
- PLEASE 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_forwardDetermine 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 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
- 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 degrees, Cohesion = 11.76 kPa, Surcharge = 9.32 kPa.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_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
- Use Eq. (12.3), Figure P12.2, and the following values to determine the at-rest lateral earth force per unit length of the wall. Also find the location of the resultant. H = 5 m, H1 = 2 m, H2 = 3 m, γ = 15.5 kN/m3, γsat = 18.5 kN/m3, Φ' = 34º, c' = 0, q = 20 kN/m2, and OCR = 1.arrow_forwardQ.4 A 6 m tall cantilever wall retains a soil that has the following properties: c' = 0, Ø = 30o, and ϒ= 19.2 kN/m3.The ground surface behind the wall is inclined at a slope of 3 horizontal to 1 vertical, Determine the active forces acting on the back of this wall using coulomb’s theory.arrow_forward3) A 5-m-high retaining wall is shown in Figure-2. Determine A) Rankine active force per unit length of the wall and the location of the resultant B) Rankine passive force per unit length of the wall and the location of the resultantarrow_forward
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