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The total active thrust on a vertical wall 3m high retaining a horizontal sand backfill (unit weight γt = 20 kN/m3, angle of shearing resistance φ' = 30°) when the water table is at the bottom of the wall, will be:

30 kN/m
35 kN/m
4 kN/m
45 kN/m

Correct Answer: 30 kN/m

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