For the retaining wall shown above calculate the following: A) Calculate the value of K (for either the 'active' or 'passive' earth pressure - whichever is appropriate! ...you decide). B) Calculate and sketch the pressure distribution on the 'back' side (soil side) of the retaining wall (show all of the relevant pressure distributions and indicate the magnitude of the distributions on the sketch). Indicate the correct units! C) Calculate the resultant horizontal force for each pressure distribution and calculate the total overturning moment about the base of the wall. Show the forces in the correct units!

Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN:9781305081550
Author:Braja M. Das
Publisher:Braja M. Das
Chapter13: Retaining Walls
Section: Chapter Questions
Problem 13.6P
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T
3 m
3 m
P₁K,YH
Ground
water table
For the retaining wall shown above calculate the following:
A) Calculate the value of K (for either the 'active' or 'passive' earth pressure - whichever is appropriate!
...you decide).
K. tan² (45° - 4)
Ka
2
B) Calculate and sketch the pressure distribution on the 'back' side (soil side) of the retaining wall (show
all of the relevant pressure distributions and indicate the magnitude of the distributions on the sketch).
Indicate the correct units!
C) Calculate the resultant horizontal force for each pressure distribution and calculate the total
overturning moment about the base of the wall. Show the forces in the correct units!
-KY'H
D) If this wall has a 'depth' (in-and-out of the 'page') of 20-m, what is the total horizontal force applied
to the wall? How much total friction force is needed between the base of the wall and the soil to
provide a Factor of Safety of 2.0 against 'sliding'.
(useful formulas are given below)
(a) Passive
y = 16 kN/m
= 30°
c=0
K₂Yz
Ysat 18 kN/m³
= 35°
c=0
PK23
KTH
(b) Active
Ho
3
Z
hu
K₂ tan² 45° + 2
(ox)a= Kao'z + Kaqs + u
(ox) p = Kpo'z + Kpqs + u
9₁
(c) Hydrostatic pressure
KAH
Ho
KA
(d) Surface stress
2
Transcribed Image Text:T 3 m 3 m P₁K,YH Ground water table For the retaining wall shown above calculate the following: A) Calculate the value of K (for either the 'active' or 'passive' earth pressure - whichever is appropriate! ...you decide). K. tan² (45° - 4) Ka 2 B) Calculate and sketch the pressure distribution on the 'back' side (soil side) of the retaining wall (show all of the relevant pressure distributions and indicate the magnitude of the distributions on the sketch). Indicate the correct units! C) Calculate the resultant horizontal force for each pressure distribution and calculate the total overturning moment about the base of the wall. Show the forces in the correct units! -KY'H D) If this wall has a 'depth' (in-and-out of the 'page') of 20-m, what is the total horizontal force applied to the wall? How much total friction force is needed between the base of the wall and the soil to provide a Factor of Safety of 2.0 against 'sliding'. (useful formulas are given below) (a) Passive y = 16 kN/m = 30° c=0 K₂Yz Ysat 18 kN/m³ = 35° c=0 PK23 KTH (b) Active Ho 3 Z hu K₂ tan² 45° + 2 (ox)a= Kao'z + Kaqs + u (ox) p = Kpo'z + Kpqs + u 9₁ (c) Hydrostatic pressure KAH Ho KA (d) Surface stress 2
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