Practice Quiz

Civil Engineering PE

Category - Soil Mechanics

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What is the lateral force against an 8-foot high retaining wall in an active pressure condition, given the lateral pressure at the bottom of the wall is 0.32 kips per square foot (ksf)?
  1. 1.2 kips per foot of wall
  2. 120 pounds per foot of wall
  3. 1200 kips per foot of wall
  4. Not enough information provided
Explanation
Answer: A - The lateral force against an 8-foot high retaining wall in an active pressure condition with the given lateral pressure at the bottom of the wall is 1.2 kips per foot of wall.

Solution: Use Rankine’s lateral force equation Fa = ½ (pa)(h)
Where pa = 0.32 ksf
h = 8 feet (ft)
Fa = ½ (0.32 ksf) (8 ft)
= 1.2 kips per foot of wall
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