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WorksheetsSoil Consolidation
Total questions: 10
Worksheet time: 5mins
What is the primary purpose of a one-dimensional consolidation test (oedometer test)?
To measure the shear strength of soil
To estimate the amount of settlement and time of consolidation
To determine the permeability of granular soils
To assess the compaction characteristics of soil
Which of the following parameters CANNOT be determined from a consolidation test?
Coefficient of consolidation
Compression index
Angle of internal friction
Preconsolidation pressure
In the consolidation test, why is the load doubled with each increment?
To accelerate the test process
To simulate real-world stress conditions
To maintain a logarithmic stress scale for analysis
To prevent excessive deformation of the specimen
What does the coefficient of consolidation (Cv) represent?
The rate at which water flows through soil
The rate at which soil undergoes compression under load
The ratio of volume change to effective stress
The maximum stress a soil has experienced in the past
In the Casagrande method, which point on the time-settlement curve is used to determine the coefficient of consolidation (Cv)?
30% consolidation
50% consolidation
70% consolidation
90% consolidation
Given the following data from a consolidation test:
- t₉₀ = 25 min
- H = 10 mm (drainage path length)
- Time factor (Tv) for 90% consolidation = 0.848
Calculate the coefficient of consolidation (Cv) in m²/year.
0.12 m²/year
0.14 m²/year
0.16 m²/year
0.18 m²/year
A consolidation test gives the following data:
- Initial void ratio (e₀) = 1.20
- Final void ratio (e) = 0.95
- Applied stress increase (Δσ) = 100 kPa
What is the coefficient of volume compressibility (mᵥ)?
0.0012 kPa⁻¹
0.0025 kPa⁻¹
0.0035 kPa⁻¹
0.0050 kPa⁻¹
In a consolidation test, if the time for 50% consolidation (t₅₀) is 9 min and the specimen’s drainage path length (H) is 12 mm, what is the coefficient of consolidation (Cv) using the Casagrande method? (Tv for 50% consolidation = 0.197)
0.052 m²/year
0.105 m²/year
0.170 m²/year
0.420 m²/year
A clay layer has a thickness of 4 m and is subjected to a load increase. If Cv = 0.5 m²/year, how long will it take for 90% consolidation to occur? (Tv for 90% consolidation = 0.848)
1.5 years
2.7 years
4.3 years
6.8years
If the preconsolidation pressure (σ’c) of a soil is 150 kPa and the current effective stress is 100 kPa, the soil is:
Normally consolidated
Over consolidated
Under consolidated
Heavily compacted
