This set of Geotechnical Engineering Interview Questions and Answers for freshers focuses on “Stress Condition in Soil :effective and Actual Pressure”.
1. Total stress or unit pressure on a soil mass is___________
a) Total load
b) Total surface area
c) Total volume
d) Total weight
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Explanation: At any plane in a soil mass, the total stress or unit pressure is the total load per unit area.
2. At any plane ,pore pressure is equal to___________
a) Ratio of Piezometric head to weight of water
b) Equal to piezometric head times the unit weigh of water
c) Ratio of weight of water to the piezometric head
d) None of the mentioned
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Explanation: u =hw × γw
Pore pressure=piezometric head ×weight of water.
3. Pressure transmitted from particles to the soil mass is called___________
a) Neutral pressure
b) Effective pressure
c) Pore pressure
d) Capillary pressure
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Explanation: Effective pressure ‘σ’ or intergranular pressure is the pressure transmitted from particle through their point of contact through the soil mass above the plane.
4. The neutral pressure does not have any effect on___________
a) Shearing resistance
b) Shearing strength
c) Shearing stress
d) All of the mentioned
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Explanation: The neutral pressure does not have measurable influence on the mechanical property of the soils, such as shearing resistance.
5. The total pressure in a soil mass consists of_____________distinct components.
a) 3
b) 4
c) 2
d) 5
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Explanation:
1. Effective pressure or intergranular pressure
2. Neutral pressure or pore pressure, are the two components of total pressure.
6. The neutral pressure is transmitted through___________
a) Soil particle
b) Pore fluid
c) Air particle
d) Atmosphere
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Explanation: As the neutral pressure should not have any effect on void ratio or property of soil, it is transmitted through pore fluid.
7. Total vertical pressure at any plane is equal to__________
a) σ = σ’ + u
b) σ’ = σ + u
c) σ = σ’ + v
d) None of the mentioned
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explanation : Total vertical pressure at any plane is equal to the sum of effective pressure and the total pressure i.e. σ = σ’ + u.
8. Factor of unit cross-section χ, depends on____________
a) degree of saturation
b) soil structure
c) stress change
d) all of the mentioned
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Explanation: Factor of unit cross-section varies with degree of saturation, soil structure, process by which the soil present degree of saturation and stress change.
9. For degree of saturation ,it is recommended to take χ as_____________
a) 0
b) 1
c) 2
d) ∞
View Answer
Explanation: For degree of saturation of S ≥90%, it is recommended to take χ as unity (i.e., 1).
Sanfoundry Global Education & Learning Series – Geotechnical Engineering.
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