Question Bank • QB_SUB_SWCE_0281 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Soil Mechanics

Subtopic: Active and passive earth pressures

Question Statement:

Rankine's earth pressure theory assumes that the back of the retaining wall is:

Options:

  • (A) Vertical and perfectly smooth (zero wall friction $\delta = 0$)
  • (B) Rough with friction angle equal to soil friction
  • (C) Inclined at 45 degrees
  • (D) Flexible and compressible

Answer Key:

A

Step-by-Step Solution & Explanation

Rankine assumed a vertical, frictionless wall with horizontal backfill. Coulomb's theory accounts for wall roughness and arbitrary wall batter.
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