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Primary Consolidation Settlement of Clay

Mediumconsolidationsettlement
A normally consolidated clay has Cc = 0.30, H = 4 m, e0 = 0.90, initial effective stress 100 kPa and a stress increase of 80 kPa. Primary consolidation settlement is most nearly:
  1. A40 mm
  2. B161 mm
  3. C81 mm
  4. D322 mm
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Answer: B. 161 mm

S = Cc·H/(1 + e0) × log((σ′0 + Δσ)/σ′0) = 0.30(4)/1.90 × log(180/100) = 0.632 × 0.255 = 0.161 m = 161 mm. Leaving out the (1 + e0) divisor gives about 306 mm.
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