Multiple choice

Figure given below shows a smooth vertical gravity retaining wall with cohesionless soil backfill having an angle of internal friction $\phi$ In the graphical representation of Rankine’s active earth pressure for the retaining wall shown in figure, length OP represents

  1. vertical stress at the base

  2. vertical stress at a height H/3 from the base

  3. lateral earth pressure at the base

  4. lateral earth pressure at a height H/3 from the base
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A Correct answer
Explanation

 Rankine's active earth pressure method is graphical method to determine the active earth pressure of the soil.OP dose not cut the mohr;s circle tangential, so OP represents the vertical stress at the base.

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