Foundation Engineering Questions and Answers – Earth Pressure Introduction – 2

This set of Foundation Engineering Interview Questions and Answers focuses on “Earth Pressure Introduction – 2”.

1. In active state, the minor principal stress σ₃ is _________
a) horizontal direction
b) vertical direction
c) can be both vertical and horizontal direction
d) in no direction
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2. In passive state, the major principal stress σ₁ ____________
a) horizontal direction
b) vertical direction
c) can be both vertical and horizontal direction
d) in no direction
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3. In passive state, the minor principal stress σ₃ is _________
a) horizontal direction
b) vertical direction
c) can be both vertical and horizontal direction
d) in no direction
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4. For cohesion-less soil, the ratio of major to minor principal stress is __________
a) \(\frac{σ_1}{σ_3} = cos^2 (45°+\frac{φ}{2})\)
b) \(\frac{σ_1}{σ_3} = sin^2 (45°+\frac{φ}{2})\)
c) \(\frac{σ_1}{σ_3} = tan^2 (45°+\frac{φ}{2})\)
d) \(\frac{σ_1}{σ_3} = tan^2 (45°-\frac{φ}{2})\)
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5. The ratio of horizontal stress σ_h to vertical stress σ_v is _______
a) coefficient of earth pressure
b) coefficient of volume change
c) coefficient of compressibility
d) coefficient of consolidation
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6. The coefficient of earth pressure for active state of plastic equilibrium is given by ___________
a) \(K_a=\frac{1}{tan^2 (45°+\frac{φ}{2})} \)
b) \(K_a=tan^2 (45°+\frac{φ}{2}) \)
c) \(K_a=sin^2 (45°+\frac{φ}{2}) \)
d) \(K_a=\frac{1}{cot^2 (45°+\frac{φ}{2})} \)
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7. The coefficient of earth pressure for passive state of plastic equilibrium is given by ________
a) \(K_p=\frac{1}{tan^2 (45°+\frac{φ}{2})} \)
b) \(K_p=tan^2 (45°+\frac{φ}{2})\)
c) \(K_p=sin^2 (45°+\frac{φ}{2})\)
d) \(K_p=\frac{1}{cot^2 (45°+\frac{φ}{2})} \)
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8. The coefficient of earth pressure for active state of plastic equilibrium in terms of sine function is _______
a) \(K_a=1-sinφ\)
b) \(K_a=\frac{1-sinφ}{1+sinφ} \)
c) \(K_a=\frac{1+sinφ}{1-sinφ} \)
d) K_a=1+sinφ
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9. The coefficient of earth pressure for passive state of plastic equilibrium in terms of sine function is _______
a) \(K_a=1-sinφ\)
b) \(K_a=\frac{1-sinφ}{1+sinφ} \)
c) \(K_a=\frac{1+sinφ}{1-sinφ} \)
d) K_a=1+sinφ
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10. During the active state of plastic equilibrium, the retaining wall moves _______
a) towards the fill
b) away from the fill
c) does not change its position
d) remains in equilibrium
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11. During the passive state of plastic equilibrium, the retaining wall moves _______
a) towards the fill
b) away from the fill
c) does not change its position
d) remains in equilibrium
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12. In active state of plastic equilibrium, the earth pressure on the wall ________
a) increases
b) decreases
c) is zero
d) is constant
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13. In passive state of plastic equilibrium, the earth pressure on the wall ________
a) increases
b) decreases
c) is zero
d) is constant
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14. In active state, the failure wedge shows ____________
a) downward movement
b) upward movement
c) left side movement
d) right side movement
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15. In passive state, the failure wedge shows ____________
a) downward movement
b) upward movement
c) left side movement
d) right side movement
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