Week 7 - Workshop Flashcards
1
Q
Some facts about retaining wall?
A
- Holds the ground at an angle steeper than shear strength would otherwise permit.
- Restore horizontal force from: earth pressure, water pressure and surcharge pressure
- Two basic type: Gravity, Embedded, Reinforced Soil
- Effective stress (long term/drained condition) usually worst case.
2
Q
Examples of Gravity wall?
A
- Mass concrete
- Gabions
- Reinforced concrete (L-shaped)
- Reinforced Concrete (T-shaped)
3
Q
Gravity wall failure modes
A
- Overturning
- Sliding
- Bearing capacity
- Structural failure
4
Q
Gravity Wall - failure modes
A
ULS
- sliding
- overturning
- max bearing pressure
- Global failure
SLS
- excessive displacement/ settlement behind wall
- settlement of wall
- tilt of wall face
5
Q
How to restore the horizontal force?
A
- self weight
- passive pressure
6
Q
What is the restoring force equation?
A
7
Q
What do the mass concrete and l shape gravity walls have?
A
Friction/ Adhesion generated over base
8
Q
How to determine U as a total upthrust
A
𝑈ℎ𝑒𝑒𝑙×𝐵/2 =
9
Q
What does the interface friction depend on?
A
Depends on the degree of cementation between base concrete / soil
10
Q
Equation when concrete is cast in situ
A
11
Q
Equation for precast bases
A
12
Q
Equation for Passive resistance
A
