Foundation Engineering Questions and Answers – Active Earth Pressure of Cohesive Soils

This set of Foundation Engineering Interview Questions and Answers for Freshers focuses on “Active Earth Pressure of Cohesive Soils”.

1. The principal stress relationship on a failure plane is given by _______
a) σ₁=σ₃ tan² α
b) σ₁=2c tan⁡α-σ₃ tan² α
c) σ₁=2c tan⁡α+σ₃
d) σ₁=2c tan⁡α+σ₃ tan² α
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2. The Belli equation of lateral pressure of cohesive soil is ____________
a) p_a=γzcot² α-2c cot⁡α
b) p_a=γzcot² α+2c cot⁡α
c) p_a=-2c cot⁡α
d) p_a=γzcot² α/2c cot⁡α
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3. The Belli equation at the ground surface is given by _________
a) p_a=γzcot² α-2c cot⁡α
b) p_a=γzcot² α+2c cot⁡α
c) p_a=-2c cot⁡α
d) p_a=γzcot² α/2c cot⁡α
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4. The tension at the top level of retaining wall reduces to zero at a depth ___________
a) \(z_0=\frac{q-2c cot⁡α}{γ} \)
b) \(z_0=\frac{2c tan⁡α}{γ} \)
c) \(z_0=\frac{2 cot⁡α}{γ} \)
d) \(z_0=\frac{cot⁡α}{γ} \)
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5. The depth at which the tension is zero for cohesive soils with retaining wall in terms K_a is _____
a) \(z_0=\frac{2cK_a}{γ} \)
b) \(z_0=\frac{2c}{γ} \frac{1}{√K_a } \)
c) \(z_0=\frac{2cK_a}{γ} \)
d) \(z_0=\frac{2c}{γ}(\frac{1}{K_a}) \)
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6. The effect of cohesion in the soil is to __________
a) reduce pressure intensity
b) increase pressure intensity by 3
c) double the pressure intensity
d) increase pressure intensity by 4
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7. For a cohesive soil, the pressure intensity is reduced by a factor of __________
a) 2c cot⁡α
b) 2c tan⁡α
c) 2c sin⁡α
d) 2c cos⁡α
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8. The total net pressure for a cohesive soil is given by ________
a) P_a=\(\frac{1}{2}\) K_a γH² cot² α-2c cot⁡α
b) P_a=γH²-2c cot⁡α
c) P_a=K_a γH²-2c cot⁡α
d) P_a=K_a H²-2c cot⁡α
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9. If a tension crack is developed at the top of wall to a depth Z_o in cohesive soils, then the total net pressure is zero for a depth of _________
a) 2Z_o
b) 3Z_o
c) 4Z_o
d) 5Z_o
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10. The critical height for an unsupported vertical cut in cohesive soil is given by _____________
a) \(H_c=\frac{q-2c cot⁡α}{γ} \)
b) \(H_c=\frac{4c tan⁡α}{γ} \)
c) \(H_c=\frac{4 cot⁡α}{γ} \)
d) \(H_c=\frac{cot⁡α}{γ} \)
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11. For an inclined back and surcharge, if P1, is horizontal pressure and W is weight of soil wedge, then the total pressure is given by __________
a) P=P₁+W
b) \(P=\sqrt{P_1^2+W^2}\)
c) P=(P₁+W)²
d) P=P₁-W
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12. When the top tension portion of the wall in cohesive soil is neglected, the total lateral thrust is given by __________
a) P_a=\(\frac{1}{2}\)K_a γH² cot² α-2c cot⁡α
b) P_a=\(\frac{1}{2}\)K_a γH² cot² α-2c cot⁡α+\(\frac{2c^2}{γ}\)
c) P_a=\(\frac{1}{2}\)K_a γH² cot² α-2c cot⁡α-\(\frac{2c^2}{γ}\)
d) P_a=K_a H²-2c cot⁡α
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13. If the cohesive backfill carries a surcharge of q per unit area, then the lateral pressure is increased by _________
a) K_a q
b) q
c) K_a
d) K_a/q
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14. The lateral pressure for cohesive backfill with surcharge q is ___________
a) p_a=γzcot² α-2c cot⁡α+qcot² α
b) p_a=γzcot² α+2c cot⁡α+cot²α
c) p_a=-2c cot⁡α-cot² α
d) p_a=γzcot² α/2c cot⁡α
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15. For a cohesive backfill with surcharge q, when at depth z₀, p_a=0, then the depth z₀ is ___________
a) \(z_0=\frac{q-2c cot⁡α}{γ} \)
b) \(z_0=\frac{2c tan⁡α}{γ}-\frac{q}{γ} \)
c) \(z_0=\frac{2 cot⁡α}{γ}+\frac{q}{γ} \)
d) \(z_0=\frac{cot⁡α}{γ}-\frac{q}{γ} \)
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Sanfoundry Global Education & Learning Series – Foundation Engineering.

To practice all areas of Foundation Engineering for Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.

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