Rankine Ka for Level Granular Backfill
EasyRankineactive pressure
For level granular backfill with φ = 30°, the Rankine active earth pressure coefficient Ka is most nearly:
- A0.25
- B0.50
- C0.333
- D3.00
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Answer: C. 0.333
Ka = (1 − sin30°)/(1 + sin30°) = 0.5/1.5 = 0.333. The passive coefficient is the inverse, 3.0.
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