Quiz
Geotech II - Chapter 13
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Questions in this quiz (22)
1The magnitude and distribution of lateral earth pressure depends on many factors, such as:
(select all that apply)- Athe shear strength parameter of the soil
- Bthe inclination of the backfill
- Cthe retaining wall material
- Dthe type of surcharge applied
- Ethe height and inclination of the retaining wall
2Retaining walls are considered:
- Africtionless
- Bto have only horizontal effective pressures applied
- Cto have friction along the height of the wall
- Dto have four possible pressure cases
3TRUE OR FALSE: Retaining walls have three possible cases - at-rest, passive, and active.
- ATrue
- BFalse
4TRUE OR FALSE: K is the ratio of vertical effective pressure (sigma o') and horizontal effective pressure (sigma h')
- ATrue
- BFalse
5Match each diagram to their respective pressure case.
- AAt-Rest
- BPassive
- CActive
- DAt-Rest
- EPassive
- FActive
- GAt-Rest
- HPassive
- IActive
6Active pressure cases fail sliding down the failure plane and create a horizontal effective stress referred to the active pressure.
- ATrue
- BFalse
7Passive pressure cases fail sliding down the failure plane and the horizontal effective pressure is referred as the passive pressure.
- ATrue
- BFalse
8In the case of partially submerged soil, the pressure on the wall is found from:
- Athe effective stress
- Bthe lateral earth pressure
- Ceffective stress and pore water pressure
9Horizontal effective stress and pore water pressure vary with depth
- ATrue
- BFalse
10Rankine's failure surface is assumed to be a logarithmic curve in this chapter.
- ATrue
- BFalse
11In Rankin'es pressure theory, the angles alpha, theta, and phi' are known as:
- Athe backfill inclination angle, wall backface angle, drain angle of friction
- Bwall backface angle, backfill inclination angle, drain angle of friction
- Cdrain angle of friction, wall backface angle, backfill inclination angle
12Mohr's Circle "a" is the case for the Rankine's Active state, and Mohr's Circle "b" is the case for Rankine's At-Rest state.
- ATrue
- BFalse
13Rankine's Passive state has significantly greater stresses occurring than the Active State.
- ATrue
- BFalse
14Label Rankine's Passive Pressure
- ASlip plane (1)
- BInternal stress condition of the soil
- CUltimate failure plane
- Dthe normal stress plane
- Eslip plane
- Fthe initial stress condition in the soil
- Gmohr's circle for passive pressure
- Hthe initial stress condition on the soil
- IMohr's circle for the passive state
15The active force per unit length of the wall can be given as
- AKp
- BKa
- CPa
- DSigmaA
16Which statement is true about retaining wall failure scenarios.
- AThe passive case failure is more common
- BThe passive case experiences bearing capacity failure
- CThe active case experiences overturning, while the passive experiences sliding failure. The allowable change in horizontal length is greater in the active case.
17Water tables have what effect on retaining walls?
- AA reduction in soil cohesion strength and vertical effective stress
- Bbuoyancy in the bottom soil layer and a reduction in active earth pressure behind the wall
- Cnegligible
- Daddition of water weight and an increase in active earth pressure behind the wall
- Eonly on effective stress, not the total soil stress behind the wall
18The triangular pressure distribution at the left end of the footing is:
- Athe passive earth pressure associated with a wall tilt to the right failure mode
- Bassociated with a necessary embedment depth such that the wall does not experience differential settlement
- Ca soil pressure that resists sliding at E
- Dall of the above
19TRUE OR FALSE: The three failure modes for retaining walls are bearing capacity, sliding, and overturning.
- ATrue
- BFalse
20Embedding retaining walls have what benefit?
- AImprove the factor of safety against sliding and reduce the overall earth pressure force on the wall
- BIt has no benefit
- CReduce soil stress behind the wall and bearing capacity failure
21In Coulomb's Earth Pressure Theory, Delta' is the soil wall friction angle and orientation of the resultant force.
- ATrue
- BFalse
22Coulomb's Active pressure case is assumed to support a nongranular, cohesive soil.
- ATrue
- BFalse
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- Engineering Quiz on Geotech II - Chapter 13, created by Kiki Medina on 16/11/2018.
- Author
- Kiki Medina
- Language
- English
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