Civil Engineering MCQAE Level Civil Engineering
For a doubly-drained clay layer of thickness 2H, the time for 90% consolidation is t₉₀ = T₉₀ × H²/C_v. The time factor T₉₀ is approximately:
Soil MechanicsConsolidation RateMEDIUM
Choose the correct answer
A
0.197
B
0.405
C
0.848
D
1.0
Correct Answer
C. 0.848
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Time factors: T₅₀ = 0.197 (50% consolidation), T₉₀ = 0.848 (90% consolidation), T_100 → ∞. These are standard values from the consolidation equation for double drainage.
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