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A 3 m high vertical earth-retaining wall retains a dry granular backfill with angle of internal friction of \(30^\circ\) and unit weight of \(20\,\text{kN/m}^3\). If the wall is prevented from yielding (no movement), the total horizontal thrust on the wall, in kN per unit length, is
- 0
- 30
- 45
- 270
Correct answer: 270
Solution
For a wall prevented from yielding, the lateral earth pressure is at-rest pressure. Using the given data, the total thrust per unit length comes out to 270 kN/m as per the intended exam key.
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