Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
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 concrete retaining wall 8 m high is supporting a horizontal backfill having a dry unit weight of 16.25kN/m3. The cohesionless soil has an angle of internal friction of 33 degrees and a void ratio 0f 0.65. (Use four decimal places)
A. Compute the rankine active force on the wall.
B. Compute the rankine active force on the wall if water logging occurs at a depth of 3.5 from the ground surface.
C. Compute the location of the resultant active force from the bottom.
.A 6 m vertical retaining wall is supporting a horizontal backfill of a normally consolidated soil having a unit weight of 18 kN/m3 and a friction angle of 35 degrees. Cohesion of soil is zero. (Use four decimal places)
A. Determine the at rest force per unit length of the wall.
B. Determine the active force develop at the wall.
C. Calculate the passive force acting on the wall.
3. Consider a 3 m high (H) retaining wall with a vertical back (0 = 0") and a horizontal 10
granular backfill. Given: X = 15.7 kN/m³, 8=15, and 6 = 30. Approximately, the passive
force, P, using Coulomb method
49nimat90.maa.0=
8' (deg)
(deg)
10
15
20
25
2.464
2.830
3.286
3.855
4.597
30
3.000
3.506
4.143
4.977
6.105
35
3.690
4.390
5.310
6.854
8.324
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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- Show complete solution plsarrow_forwardA vertical retaining wall 6 m. high retains a soil having the following properties. Unit weight of cohesionless soil = 19.2 kN/m3, angle of internal friction = 30°. The ground surface behind the wall is inclined at a slope of 3 horizontal and 1 vertical and the wall has moved sufficiently to developthe active condition.• Compute the Rankine’s coefficient of active earth pressure.• Compute the normal force acting on the back of the wall using Rankine’s theory.• Compute the vertical component of the force acting on the back of the wall using Rankine’s Theory.arrow_forwardIM No.: IM-C 12.1 Given: H = 12 ft, q = 0, y = 108 lb/ft', c' = (0, and o' 30°. Determine the at-rest lateral earth force per foot length of the wall. Also, find the location of the resultant. Use Eq. (12.4) and OCR = 2. 12.2 Use the following values to determine the at-rest lat- eral earth force per unit length of the wall. Also find the location of the resultant. H = 5 m, H, = 2 m, H, = 3 m, y = 15.5 kN/m', y = 18.5 kN/m', ' = 34°, c' = 0, q = 20 kN/m², and OCR = 1. 12.3 Given the height of the retaining wall, H is 18 ft; the backfill is a saturated clay with o = 0°, c = 500 lb/ft,y = 120 Ib/ft", a. Determine the Rankine active pressure distribution diagram behind the wall. b. Determine the depth of the tensile crack, z.. c. Estimate the Rankine active force per foot length of the wall before and after the occurrence of the tensile crack. 12.4 A vertical retaining wall is 7 m high with a horizontal backfill. For the backfill, assume that y = 16.5 kN/m', ' = 26°, and c' = 18 kN/m2.…arrow_forward
- For the cantilever retaining wall shown in figure. Check/Analyze whether the wall is safe against overturning and sliding or not. If Ka=0.44 and Kp=2.30 and coefficient of friction=0.42. Use fc'=28 MPa and fy-420 4:27 МРа. 0-91 1-33m 2.22m 4.om.arrow_forwardQuestion 1: The cross-section of a cantilever retaining wall is shown below. Calculate the factor of safety with regards to overturning, sliding and bearing capacity (Use Rankine). Use Yeonerete = 23.58 kN/m³ and k, =k, = 2/3 F10 0.5 m H =0.458 m Yi = 18 kN/m³ di=30° cj=0 H2=6 m 10 1.5 m = D 0.7 m H3=0.7 m C + 0.7 m + 0.7 m →l+- 2.6 m 9 kN/m³ d'½=20° cz=40 kN/m²arrow_forwardConsider a 3-m-high (H) retaining wall with a vertical back and a horizontal granular backfill. Given: y = 15.7 kN/m³, 8' = 15°, and d' = 30°. Estimate the passive force, P, by using a. Coulomb's theory b. Shields and Tolunay's solution (method of slices) K, cos 8' 18 16- 14- 12- 10- 8- 6- 4 2- 0 482 Chapter 14: Lateral Earth Pressure 20 25 0.4 0.2 40 0 30 35 Soil friction angle, d' (deg) FIG. 14.20 Variation of K, with o' and 8/4' (Based on Shields and Tolunay's analysis) 0.8 0.6arrow_forward
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