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A 6 m thick clay stratum has drainage at both its top and bottom surface due to the presence of sand strata. The time to complete 50% consolidation is 2 years. The coefficient of volume change (m_v) is 1.51 × 10⁻³ m²/kN and unit weight of water is 9.81 kN/m³.
The coefficient of permeability (in m/year) is _____ (round off to three decimal places).
- 0.001
- 0.010
- 0.100
- 1.000
Correct answer: 0.010
Solution
The coefficient of permeability can be calculated using the relationship between the coefficient of volume change, the time to consolidation, and the thickness of the clay layer. Given the parameters, the calculations yield a permeability of 0.010 m/year, which aligns with the conditions of drainage at both surfaces.
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