Foundation Engineering Questions and Answers – Earth Pressure Introduction – 1

This set of Foundation Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Earth Pressure Introduction – 1”.

1. The plastic state of stress when the failure is imminent was investigated by ___________
a) Rankine
b) Darcy
c) Skempton
d) Terzaghi
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2. ___________ is used for maintaining the ground surface at different elevations.
a) Floor
b) Retaining wall
c) Ceiling
d) Roof
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3. The material retained by the retaining wall is known as_________
a) roof
b) slab
c) backfill
d) footing
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4. The backfill has its top surface ____________
a) horizontal only
b) inclined only
c) both horizontal and inclined
d) vertical only
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5. The portion of backfill lying above a horizontal plane of wall is called ________
a) surcharge
b) base
c) foot
d) truss
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6. Surcharge angle β is ____________
a) inclination of surcharge to the vertical
b) inclination of surcharge to the normal of the wall
c) inclination of surcharge to the horizontal
d) inclination of surcharge to the tangent to the wall
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7. A body is said to be in plastic equilibrium, if every point of it is ________
a) in the verge of failure
b) in equilibrium
c) in stable state
d) elastic state
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8. The stress condition during plastic equilibrium can be represented by _____________
a) \(\frac{σ_1-σ_3}{2}\frac{σ_1+σ_3}{2} sinφ=cosφ \)
b) \(\frac{σ_1-σ_3}{2}+\frac{σ_1+σ_3}{2} sinφ=c cosφ\)
c) \(\frac{σ_1*σ_3}{2}-\frac{σ_1+σ_3}{2} sinφ=c cosφ\)
d) \(\frac{σ_1-σ_3}{2}-\frac{σ_1+σ_3}{2} sinφ=c cosφ\)
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9. The stress condition during plastic equilibrium in terms of tangent of angle is _______
a) \(σ_1=tan⁡(45°+\frac{φ}{2})+σ_3 tan^2 (45°+\frac{φ}{2}) \)
b) \(σ_1=2c+σ_3 tan^2 (45°+\frac{φ}{2})\)
c) \(σ_1=2c \,tan⁡(45°+\frac{φ}{2})+σ_3\)
d) \(σ_1=2c \,tan⁡(45°+\frac{φ}{2})+σ_3 tan^2 (45°+\frac{φ}{2})\)
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10. The flow value is given by ______
a) \(N_φ=cot^2 (45°+\frac{φ}{2})\)
b) \(N_φ=cos^2 (45°+\frac{φ}{2})\)
c) \(N_φ=tan^2 (45°+\frac{φ}{2})\)
d) \(N_φ=sin^2 (45°+\frac{φ}{2})\)
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11. The plastic equilibrium stress equation in terms of flow valve is _____
a) σ₁=2c∛N_φ+σ₃ N_φ
b) σ₁=2c√N_φ+σ₃ N_φ
c) σ₁=2cN_φ-σ₃ N_φ
d) σ₁=N_φ+σ₃ N_φ
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12. The Mohr Coulomb equation in terms of stress components in x-z plane is ______________
a) \(\sqrt{((\frac{σ_z-σ_x}{2})^2+τ_{xz}^2))} -\frac{σ_z+σ_x}{2} sinφ=c cosφ\)
b) \(\sqrt{((\frac{σ_z-σ_x}{2})^2+τ_{xz}^2))} \frac{σ_z+σ_x}{2} sinφ=c cosφ\)
c) \(\sqrt{((\frac{σ_z-σ_x}{2})^2+τ_{xz}^2))} = c cosφ\)
d) \(\sqrt{((\frac{σ_z-σ_x}{2})^2+τ_{xz}^2))} -\frac{σ_z+σ_x}{2} sinφ=cosφ\)
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13. Combing the three equations, \(\sqrt{((\frac{σ_z-σ_x}{2})^2+τ_{xz}^2))} -\frac{σ_z+σ_x}{2} sinφ=c cosφ\), \(\frac{∂σ_x}{∂x}+\frac{∂τ_{xz}}{∂z}=0\), and \(\frac{∂τ_{xz}}{∂x}+\frac{∂σ_x}{∂z}+γ=0\), lead to the equation called ___________
a) Kolter’s equation
b) Terzaghi’s equation
c) Darcy’s equation
d) Skempton’s equation
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14. The solution of Kolter’s equation gives ____________
a) permeability of soil
b) orientation of slip lines
c) specific gravity of grains
d) seepage pressure
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15. In active state, the major principal stress σ₁ is ____________
a) horizontal direction
b) vertical direction
c) can be both vertical and horizontal direction
d) in no direction
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Sanfoundry Global Education & Learning Series – Foundation Engineering.

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