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 15.20P
(a)
To determine
Find the average cohesion
(b)
To determine
Plot the earth pressure envelope.
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A cutting is made in clay y=20kN/m³, ¤ =0, c = 35 kN/m2. Take FOS=
1.5 and Sn = 0.17. Maximum depth of cutting will be,
5.86
10.29 m
6.86 m
9.29
Refer to Figure 15.10a. For the braced cut, given H = 8 m; H, = 3 m; y,
17.5 kN/m³; angle of friction of sand, 4' = 34°; H¸ = 5 m; y.
unconfined compression strength of clay layer, q, = 55 kN/m².
a. Estimate the average cohesion (cav) and average unit weight (yav) for the con-
struction of the earth-pressure envelope.
b. Plot the earth-pressure envelope.
18.2 kN/m³; and
Question 2
Refer to the braced cut shown in Figure Q2, for which y = 17.6 kN/m², 6' = 32°, and c’ = 0.
The struts are located 4 m on center-to-center in the plan. Draw the earth-pressure envelope and
determine the strut loads at levels A, B, and C.
Determine also:
a. The sheet-pile section modulus, assume that Gan =170 x 10³ kN/m?
b. The required section modulus of the wales at level A; assume that Gan = 173 x 10º kN/m²
-5 m-
2 m
A
3 m
В
c = 0
3 m
C
1 m
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 cut is to be made in clay for which the cohesion is 40 kN/m² and = 0. The maximum safe depth of cut will be m. (upto one decimal place) For FOS = 1.5, Take Sn = 0.17 and Y = 20 kN/m³.arrow_forwardA cut was made in a homogeneous clay soil to a depth of 8 m as shown in below Figure. The total unit weight of the soil is 18 kN/m³, and its cohesive strength is 25 kN/m². Assuming a = 0 condition, determine the factor of safety with respect to a slip circle passing through the toe using Swedish circle method. Consider a tension crack at the end of the slip circle on the top of the cut. 8 m R = 12 m 39⁰ 6m Trial slip circle y = 18 kN/m³ c'= 25 kN/m² o'=0arrow_forwardPlease solve all the three a,b,c as soon as possible. A trench is to be excavated in a clay soil with γsat =20 kN/m3 and su=15 kPa.(a) Determine the theoretical maximum depth of thetrench without lateral support.(b) It was decided to use a bentonite slurry of unitweight γf to fill the trench as excavation proceeds.Show that the theoretical maximum depth of thetrench is Hcr = 4su / γsat - γf where γsat is the saturatedunit weight of the soil and su is the undrainedshear strength.(c) How much deeper can the trench be excavated byusing a bentonite slurry of γf= 11 kN/m3?arrow_forward
- Refer to the braced cut shown below. Given: unit weight = 17 kN/m3, Friction angle = 35degrees, and c = 0. The struts are located at 3 m center-to-center in the plan. a. Draw the earth-pressure envelope and determine the strut loads at levels A, B, and C. b. Determine the sheet-pile section modulus c. Determine the section modulus of the wales at level B Assume that = 170 MN/m2.arrow_forwardA long trench is excavated in medium dense sand for the foundation of a multistory building. The side of the trench are supported with sheet piles fixed in place by struts and wales as shown in the figure. Wales are braced at every 4m center to center. Determine the structs from A-C. 1.5ml Sand 2.5m y = 17kN/m³ - = 35° 8m 2.5m 1.5m A B Carrow_forwardSituation 9: An 8m deep braced cuts in medium clay is shown. The unit weight = 16.5 kN/m3 and the undrained shear strength Cu = 27.8 kPa. In the plan, the struts are placed at spacing 2.4m center to center. Using Peck's Empirical pressure diagram: m 0.25H 2m В H= 8 m 0.75 H 2|m 2|m Pa = yh - 4Cu %3D 41. Compute the actual load on strut A. A. 124.57 kN C. 116.47 kN B. 153.48 kN D. 162.81 kN 42. Compute the actual load on strut B. А. 33.29 kN C. 28.42 kN B. 40.54 kN D. 35.29 kN 43. Compute the actual load on strut C. A. 127.92 kN C. 131.95 kN B. 210.38 kN D. 199.68 kNarrow_forward
- Figure Question 2 depicts the design of a gravity retaining wall for carthquake condition given: Kv-0 and Kh-0.37 What should be the weight of the wall for a zero-displacement condition? Use a factor of safety of 2.4. What should be the weight of the wall for an allowable displacement of 50.95 mm? Sand $:= 35° %3D Sand $=37 3. Figure Question 2 B Give a comprehensive detail on how to analyze a retaining wallarrow_forward"calculate Factor safety by Bearing capacity check: 11 1.5m= D C 0.7 m 2 0.5 m S Y₁ = 18 kN/m³ $₁=30° ci=0 4 0.7 m 0.7 m 2.6 m H₁ = 0.458 m H₂=6 m 10° H3=0.7 m Figure 13.12 Calculation of stability of a retaining wall Pa Ph 72= 19 kN/m³ $2=20° c₂=40 kN/m² 10° Example 13.1 The cross section of a cantilever retaining wall is shown in Figure 13.12. Calculate the factors of safety with respect to overturning, sliding, and bearing capacity.arrow_forwardQ7: For the retaining wall shown in Figure below. Fined: 1- The value of (B) to makes FS)sliding = FS) overturning. 2- The value of (0) that makes the wall safe against sliding. 1 m 1 m. %= 24 kN/m² B = ? 34 kPa Sand a = 17 kN/m² =? 8=0 c=0 16=0 C₂ = 64 kPa 6 marrow_forward
- A vertical cut is to be made in a saturated and submerged clay with c = 15 kN/m², Ysat = 18.5 kN/m³, and yw = 10 kN/m³. What is the theoretical depth to which the clay can be excavated without side collapse?arrow_forwardQ8: For the retaining wall shown in Figure below. If FS)overturning = 9, find the value of ($) of soil. 1 m 1 m 72 kPa Ye= 24 kN/m³ B=3 Sand Ya 16 kN/m³ Ф=? 8=0 c=0 WURSS 6 marrow_forwardO DrahmedsoilMechanicsnoteschapter5.pdf s/DrahmedsoilMechanicsnoteschapter5.pdf A V - 14 A 10-m-thick layer of stiff saturated clay is underlain by a layer of sand. The sand is under artesian pressure. A 5.75-m-deep cut is made in the clay. What would be the maximum permissible depth of cut before heaving would occur. Determine the factor of safety against heaving at point A. Ans.: H =6.88m, FOS = 1.36 P = 1925 kg/m 5.75 m 10 m Saturated clay 6 m Sand Par - 1840 kg/m 2.5 m Soil Mechanics Assistant Prof. Dr. Ahmed Al-Obaidi Civil Eng Dept - College of Eng. (173) 5.15 Refer to Problem 5.14. Water may be introduced into the cut to improvearrow_forward
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