Q. In a settlement analysis, what does the term 'primary consolidation' refer to?
A.
Immediate settlement due to applied load
B.
Long-term settlement due to soil creep
C.
Settlement due to the expulsion of pore water
D.
Settlement due to soil shrinkage
Solution
Primary consolidation refers to the settlement that occurs due to the expulsion of pore water from the soil, leading to a decrease in volume over time.
Correct Answer:
C
— Settlement due to the expulsion of pore water
Q. What is the coefficient of consolidation (Cv) used for in settlement analysis?
A.
To determine the shear strength of soil
B.
To calculate the rate of consolidation
C.
To assess soil permeability
D.
To evaluate soil compaction
Solution
The coefficient of consolidation (Cv) is used to calculate the rate at which consolidation occurs in saturated soils, influencing the time it takes for settlement to occur.
Correct Answer:
B
— To calculate the rate of consolidation
Q. What is the effect of preloading on settlement?
A.
It increases immediate settlement
B.
It reduces long-term settlement
C.
It has no effect on settlement
D.
It only affects shear strength
Solution
Preloading is used to reduce long-term settlement by applying a temporary load to compress the soil and accelerate consolidation before the actual load is applied.
Correct Answer:
B
— It reduces long-term settlement
Q. What is the primary cause of settlement in saturated soils?
A.
Soil compaction
B.
Consolidation due to pore water pressure dissipation
C.
Soil erosion
D.
Soil expansion
Solution
Settlement in saturated soils primarily occurs due to consolidation, which is the process of pore water pressure dissipating over time, leading to a reduction in volume.
Correct Answer:
B
— Consolidation due to pore water pressure dissipation
Q. Which method is commonly used to estimate the amount of settlement in clayey soils?
A.
Terzaghi's one-dimensional consolidation theory
B.
Boussinesq's equation
C.
Mohr-Coulomb failure criterion
D.
Rankine's earth pressure theory
Solution
Terzaghi's one-dimensional consolidation theory is widely used to estimate settlement in clayey soils by considering the time-dependent behavior of saturated soils.
Correct Answer:
A
— Terzaghi's one-dimensional consolidation theory