Principles Of Foundation Engineering 9e
9th Edition
ISBN: 9781337705035
Author: Das, Braja M.
Publisher: Cengage,
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Chapter 16, Problem 16.18P
For the data given in this problem, determine the magnitude of the active thrust on the wall retaining a c′ – ϕ′ soil, using the procedure discussed in Section 16.10. Given H = 15.0 ft, c′ = 100 lb/ft2, ϕ′ = 26°, γ = 115 lb/ft3, kv = 0, and kh = 0.3.
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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 wall
You are working for a consulting firm that has been asked to evaluate the factor of safety of
the wall shown in the figure supported by a well-degraded sand. The resultant load behind
the concrete wall acts at the one third point.
Dw
1m
1.5 m
24 kN/m³
y = 20 kN/m³
26.5 kN/m
24°
= 34° n = 0.4
3 m
(a) Determine the factor of safety if Dw − D > 1.5B. Ignore the lateral passive resistance
due to the soil in front of the wall.
(b) Determine the factor of safety if the ground water table rises to 0.5 m below the base of
the wall. Discuss the significance of your observations.
Question 2
For the gravity retaining wall (concrete) shown in figure below; if the angle B has changed to be 80°,
Ø1= 29°; and a = 5° use Coulomb's theory to calculate the horizontal and vertical components of the
active earth pressure.
%!
Y-18.5 kN/m
:-32
5.7 m
5m
283 m
P.
75
2.167 m
1.5 m
1.53 m
0.8 m
0.22 m
- 18 KN/m
0.3 m
0,8 m
:-24
3.5 m
30 KN/m?
Chapter 16 Solutions
Principles Of Foundation Engineering 9e
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- Determine the lateral earth pressure force on the wall (6.0 m height shown in the figure. Draw the stress distribution and locate the location of the resultant force. Sandy soil kN Ye = 20 O = 36.0°arrow_forwardIn the retaining wall system given below, the wall height is 5 meters, the mH distance is 3 meters and the vertical force applied at this distance is 25 kN / m. According to these given values, how many kN / m is the horizontal thrust force acting on the wall. The margin of error will be taken as 0.5 for the correct answer. please fasttttarrow_forwardQ: For the retaining wall shown in the following figure, determine the force per unit length of the wall for Rankine's active state. Also find the location of the resultant. 3 m z 3 m y = 16 kN/m³ ' = 30° c' = 0 Groundwater table Y sat = 18 kN/m³ ' = 35° c' = 0arrow_forward
- 1. Refer to Figure below For H = 6 m, y = 17.0 kN/m³, o' = 36°, c' = 0, ß = 85°, a = 10°, and 8' = 24°, assume that the backfill is in the active state and use Coulomb’s equation to determine the magnitude, location, and direction Pa of the active thrust on the wall. H 2. what would be the active thrust Pa there is a surcharge of 25 kN/m² at the ground level? whenarrow_forwardDetermine the active lateral earth pressure on the frictionless wall shown in the figure below. Sketch the lateral earth pressure distributions and calculate the resultant force and its location from the base of the wall. Also, determine the moments of passive and active forces. Neglect seepage effects. Use Rankine's earth pressure method. (w = 10 kN/m) 3.0m Ysat 20 kN/m³ y = 19 kN/m²³ ' = 30° Ysat = 20 kN/m³ y = 18 kN/m³ o = 28 6.0marrow_forwardQ5: In the case of the retaining wall depicted below. Calculate the lateral earth fore at rest per unit length of the wall. Determine the location of the resulting force as well as its magnitude. [25] y = 16.5 kN/m $ = 30 C = 0 Ground v Water table 2.5m Yur = 19.3 kN/m 0 = 30 C = 0 2.5m Good Luckarrow_forward
- For a rigid retaining wall as seen in the following figure, compute Coulomb's active lateral earth thrust against the wall face AB and the point of application of the resultant force. H (m) 4 4 Wall Friction Angle, 8 (degree) 20 17 (degree) 0 0 0 (degree) 0 0 Backfill Soil Property 7 (kN/m³) 19.2 18.5 с (degree) (kPa) 40 0 34 0 H B a Sandy backfill with unit weight y and angle of internal friction P₁arrow_forwardd. Total earth thrust (in kN per meter length of wall) Fa = e. Location of the total earth thrust from the base of wall (in meter) ya = Thank you please help answer it.arrow_forwardd. Total earth thrust (in kN per meter length of wall) Fa = e. Location of the total earth thrust from the base of wall (in meter) ya = Thanksarrow_forward
- Consider the wall shown below. Dimensions are in meters. sand O' = 30 0.5 0.5 > 1 K Determine the active force acting on the wall. Circle your answer. b. а. Determine the FS for sliding. Circle your answer. Determine the FS for overturning. Circle your answer. d. Determine the FS for overturning if a row of tiebacks is placed 2 meters below the backfill's ground surface. Tieback spacing is 2 meters. The capacity of each tieback is 50 kN. Circle your answer. C.arrow_forwardA 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.arrow_forward2- Figure below shows a retaining wall that is restrained from yielding. Determine the magnitude of the lateral earth force per unit length for the following conditions: 1) At-rest force 2) Passive force Also, find the location of the resultant, 7, measured from the bottom of the wall. H (ft) H1 (ft) 71 (lb/fr) 72 (lb/ft³) p'ı q (lb/fr²) 10 5 90 122.4 34 26 100 Surcharge = q Sand c{ = 0 Groundwater table H Sand Y2 (saturated unit weight) có = 0 Frictionless wallarrow_forward
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