Time to 50 Percent Consolidation

Hardtime rate of consolidation

A 4-m clay layer is double drained and has cv = 2.0 × 10⁻⁷ m²/s. With Tv = 0.197 at 50% consolidation, t50 is most nearly:

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Answer: B. 46 days

Hdr = 4/2 = 2 m. t = Tv·Hdr²/cv = 0.197(4)/(2.0 × 10⁻⁷) = 3.94 × 10⁶ s = 46 days. Using the full 4 m thickness gives 182 days.

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